WO2013088898A1 - 金属錯体色素、光電変換素子、色素増感太陽電池、色素溶液および化合物 - Google Patents
金属錯体色素、光電変換素子、色素増感太陽電池、色素溶液および化合物 Download PDFInfo
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- WO2013088898A1 WO2013088898A1 PCT/JP2012/079563 JP2012079563W WO2013088898A1 WO 2013088898 A1 WO2013088898 A1 WO 2013088898A1 JP 2012079563 W JP2012079563 W JP 2012079563W WO 2013088898 A1 WO2013088898 A1 WO 2013088898A1
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- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- FIKAKWIAUPDISJ-UHFFFAOYSA-L paraquat dichloride Chemical compound [Cl-].[Cl-].C1=C[N+](C)=CC=C1C1=CC=[N+](C)C=C1 FIKAKWIAUPDISJ-UHFFFAOYSA-L 0.000 description 1
- 125000006340 pentafluoro ethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 description 1
- 125000000538 pentafluorophenyl group Chemical group FC1=C(F)C(F)=C(*)C(F)=C1F 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Chemical compound [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 125000001484 phenothiazinyl group Chemical group C1(=CC=CC=2SC3=CC=CC=C3NC12)* 0.000 description 1
- 125000001644 phenoxazinyl group Chemical group C1(=CC=CC=2OC3=CC=CC=C3NC12)* 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 125000003170 phenylsulfonyl group Chemical group C1(=CC=CC=C1)S(=O)(=O)* 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- OXNIZHLAWKMVMX-UHFFFAOYSA-M picrate anion Chemical compound [O-]C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-M 0.000 description 1
- 229920002717 polyvinylpyridine Polymers 0.000 description 1
- GKKCIDNWFBPDBW-UHFFFAOYSA-M potassium cyanate Chemical compound [K]OC#N GKKCIDNWFBPDBW-UHFFFAOYSA-M 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- CPNGPNLZQNNVQM-UHFFFAOYSA-N pteridine Chemical group N1=CN=CC2=NC=CN=C21 CPNGPNLZQNNVQM-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 125000003072 pyrazolidinyl group Chemical group 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- ZDYVRSLAEXCVBX-UHFFFAOYSA-N pyridinium p-toluenesulfonate Chemical compound C1=CC=[NH+]C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 ZDYVRSLAEXCVBX-UHFFFAOYSA-N 0.000 description 1
- 238000003380 quartz crystal microbalance Methods 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 125000006413 ring segment Chemical group 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 235000012247 sodium ferrocyanide Nutrition 0.000 description 1
- XHFLOLLMZOTPSM-UHFFFAOYSA-M sodium;hydrogen carbonate;hydrate Chemical compound [OH-].[Na+].OC(O)=O XHFLOLLMZOTPSM-UHFFFAOYSA-M 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 125000000565 sulfonamide group Chemical group 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- ILMRJRBKQSSXGY-UHFFFAOYSA-N tert-butyl(dimethyl)silicon Chemical group C[Si](C)C(C)(C)C ILMRJRBKQSSXGY-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 description 1
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical group C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 description 1
- GKXDJYKZFZVASJ-UHFFFAOYSA-M tetrapropylazanium;iodide Chemical compound [I-].CCC[N+](CCC)(CCC)CCC GKXDJYKZFZVASJ-UHFFFAOYSA-M 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 125000000025 triisopropylsilyl group Chemical group C(C)(C)[Si](C(C)C)(C(C)C)* 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- RUDATBOHQWOJDD-UZVSRGJWSA-N ursodeoxycholic acid Chemical compound C([C@H]1C[C@@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)CC1 RUDATBOHQWOJDD-UZVSRGJWSA-N 0.000 description 1
- 229960001661 ursodiol Drugs 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- AIFRHYZBTHREPW-UHFFFAOYSA-N β-carboline Chemical group N1=CC=C2C3=CC=CC=C3NC2=C1 AIFRHYZBTHREPW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D213/79—Acids; Esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
- C07D409/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing three or more hetero rings
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/10—Metal complexes of organic compounds not being dyes in uncomplexed form
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
Definitions
- the present invention relates to a metal complex dye, a photoelectric conversion element, a dye-sensitized solar cell, a dye solution, and a compound.
- Photoelectric conversion elements are used in various optical sensors, copiers, solar cells and the like.
- Various types of photoelectric conversion elements have been put to practical use, such as those using metals, semiconductors, organic pigments and dyes, or combinations thereof.
- a solar cell using non-depleting solar energy does not require fuel, and full-scale practical use is highly expected as it uses inexhaustible clean energy.
- silicon solar cells have been researched and developed for a long time. It is spreading due to the policy considerations of each country.
- silicon is an inorganic material and naturally has limitations in throughput and molecular modification.
- N3, N719, Z907, J2 and the like have been developed as metal complex dyes used in photoelectric conversion elements.
- conventional dye-sensitized solar cells generally have low photoelectric conversion efficiency and often have poor durability.
- Non-Patent Document 1 a ruthenium metal complex dye having pyrazole as a ligand has been developed (see Non-Patent Document 1), in particular, solar cells have been attracting attention and expectation as an energy source to replace nuclear power generation. There was a need for further performance improvements.
- Non-Patent Document 1 The required performance level for dye-sensitized solar cells is increasing year by year, and the conventional techniques including the metal complex dyes disclosed in Non-Patent Document 1 are not always satisfactory. Among them, the ruthenium metal complex dye developed in Non-Patent Document 1 has improved durability compared to the conventional one. However, as will be described later, two-molecule association of dye and adsorption of two or more layers of dye are performed. It was found that it tends to occur and the performance tends to vary. For this reason, it was found that there is a need for further improvement of performance without improving such performance variations and reducing other performance such as photoelectric conversion efficiency and durability. In addition, since the short-circuit current density (Jsc) is lowered by inhibiting the electron injection into the semiconductor fine particles due to the bimolecular association and multilayer adsorption of the dye, a dye that is difficult to associate is required.
- Jsc short-circuit current density
- an object of the present invention is to use a metal complex dye that exhibits both excellent reduction in performance variation and improved photoelectric conversion efficiency ( ⁇ ) and durability, and the use of this metal complex dye.
- An object of the present invention is to provide a photoelectric conversion element having excellent performance, a dye-sensitized solar cell, a dye solution containing a metal complex dye, and a compound useful as a ligand of the metal complex dye.
- the entire surface of the semiconductor fine particle can be covered with the umbrella, and the redox system in the electrolyte (for example, I 3 ⁇ ) It is considered that the approach to the surface of the semiconductor fine particles is minimized, and as a result, the reverse electron transfer can be minimized.
- the variation in performance was reduced by using the metal complex dye of the present invention. This is because, for example, different from the ruthenium metal complex dye developed in Non-Patent Document 1, the specific umbrella-shaped molecular structure suppresses the association between the dye molecules and the adsorption of two or more layers of the dye. This is thought to be because it became easier to adsorb uniformly.
- the dye has excellent performance in adsorption power, short circuit current density (Jsc), solution stability or adsorption speed.
- Jsc short-circuit current density
- the object of the present invention has been achieved by the following means.
- a photoelectric conversion element having a photosensitive layer having a layer of semiconductor fine particles adsorbed with a dye on the conductive support, a charge transfer layer containing an electrolyte, and a counter electrode, At least one tridentate ligand having at least one acidic group, at least one of the ligands coordinated to the metal atom M has an sp2 carbon atom, and the sp2 carbon atom has a cyclic group Are bonded to each other, and in a cyclic position connected to the carbon atom from an atom of the cyclic group directly connected to the sp2 carbon atom, an ⁇ -position or a ⁇ -position to the atom of the cyclic group directly connected to the sp2 carbon atom A straight or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkyla
- a certain photoelectric conversion element (2) The photoelectric conversion element according to (1), wherein the sp2 carbon atom is a carbon atom in an ethylene structure conjugated with a carbon atom constituting a ring or an aromatic ring. (3) The maximum number of linked chains N R among the number of linked chains (number of bonds) connecting the atom G1 and the atom located farthest through the linkage of the substituent R is the metal atom M The photoelectric conversion element according to (1) or (2), wherein the number is greater than 1 ⁇ 2 times the minimum number of linking chains NM-G1 of the number of linking chains (number of bonds) linking the atom G1.
- M represents Ru or Os
- LD represents a bidentate or tridentate ligand represented by the following formula (A)
- LA represents a tridentate arrangement represented by the following formula (B).
- X represents a monodentate ligand
- CI represents a counter ion when a counter ion is required to neutralize the charge
- m1 represents 1 or 2
- m2 represents 1, and m3 Represents 0 or 1.
- Cy represents a cyclic group
- R represents a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group.
- R 1 represents a linear or branched alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, An aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, a silyl group, a silyloxy group, an aryl group or a heteroaryl group; R 2 represents a substituent.
- Ar 1 and Ar 2 each independently represent a carbocyclic aromatic group having an anion, a nitrogen-containing aromatic group having a lone pair, or a nitrogen-containing aromatic group having an anion.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group.
- n1 represents an integer of 0 to 3
- n2 represents an integer of 0 to 4
- n3 represents 1 or 2
- r1 represents an integer of 1 to 3
- r2 represents an integer of 0 to 2
- l1 represents 0 or 1 is represented.
- Za, Zb and Zc each independently represents an atomic group necessary for forming a 5- or 6-membered ring, provided that at least one of the rings formed by Za, Zb and Zc is an acidic group.
- D 1 to D 4 each independently represents a carbon atom or a nitrogen atom.
- R and R 1 have the same meanings as those in formula (A).
- Ring A and ring B represent a 5-membered or 6-membered cyclic group, provided that R and R 1 are bonded to each other. When there are a plurality of R 1 s , they may be bonded to each other to form a condensed ring, which is described between the positions at which R is bonded from the atom of the bond of the above group. (The broken line in the figure means that this part may be a single bond or a double bond.)
- the photoelectric conversion element according to any one of (6) to (8), wherein in the formula (I), the LD is represented by the following formula (A-3).
- Zd is a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, perylene ring, pyrrole ring, indole ring, imidazole ring, benzimidazole ring, pyrazole ring, pyrazine ring, pyrimidine ring, benzopyrimidine ring, pyridazine ring, benzo Pyridazine ring, triazole ring, benzotriazole ring, tetrazole ring, indazole ring, triazine ring, purine ring, quinoline ring, isoquinoline ring, quinazoline ring, thiazole ring, benzothiazole ring, isothiazole ring, oxazole ring, isoxazo
- Ze to Zg each represents an atomic group necessary for forming a 5- or 6-membered ring other than the pyridine ring.
- A represents an acidic group.
- Ra represents an aryl group, heteroaryl group, alkyl group, cycloalkyl group, alkoxy group or cycloalkoxy group.
- the alkyl group has a tertiary or quaternary carbon atom
- the alkoxy group has a tertiary or quaternary carbon atom
- the carbon atom directly bonded to the oxygen atom of the alkoxy group is A secondary or tertiary carbon atom.
- R EWG represents an electron-withdrawing group.
- Rb and Rc represent a substituent. a0 represents an integer of 0-2.
- a0 is 1 or 2.
- a1 represents an integer of 1 or 2.
- a2 represents an integer of 1 to 4
- a3 represents an integer of 0 to 3
- a4 represents an integer of 0 to 4.
- the sum of a2 and a3 is an integer of 1 to 4.
- the formulas (B5) to (B8) have at least one acidic group.
- (11) The photoelectric conversion element according to (10), wherein in the formula (I), the LD is the formula (A-3), and the LA is the formula (B1).
- (12) The photoelectric conversion element according to (10), wherein in the formula (I), the LD is the formula (A-3), and the LA is the formula (B2).
- Ring A has the same meanings as in the above formulas (A) and (A-1)
- Rd is alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, alkylthio group, cycloalkylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino group, heterocyclic amino group, halogen atom, cyano group
- b1 represents an integer of 0-2.
- Ring A has the same meanings as in the above formulas (A) and (A-1)
- Rd is alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, alkylthio group, cycloalkylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino group, heterocyclic amino group, halogen atom, cyano group
- b1 represents an integer of 0-2.
- R A1 represents a substituent having an acidic group.
- R A2 represents a substituent.
- NA represents an integer of 0 or more.
- a substituent R selected from a group, an arylamino group, a heterocyclic amino group, a silyl group or a silyloxy group is substituted, and the ⁇ -position
- M represents Ru or Os
- LD represents a bidentate or tridentate ligand represented by the following formula (A)
- LA represents a tridentate arrangement represented by the following formula (B).
- X represents a monodentate ligand
- CI represents a counter ion when a counter ion is required to neutralize the charge
- m1 represents 1 or 2
- m2 represents 1, and m3 Represents 0 or 1.
- Cy represents a cyclic group
- R represents a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group.
- R 1 represents a linear or branched alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, An aryloxy group, an alkylthio group, a cycloalkylthio group, an arylthio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, a silyl group, a silyloxy group, an aryl group or a heteroaryl group; R 2 represents a substituent.
- Ar 1 and Ar 2 each independently represent a carbocyclic aromatic group having an anion, a nitrogen-containing aromatic group having a lone pair, or a nitrogen-containing aromatic group having an anion.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group.
- n1 represents an integer of 0 to 3
- n2 represents an integer of 0 to 4
- n3 represents 1 or 2
- r1 represents an integer of 1 to 3
- r2 represents an integer of 0 to 2
- l1 represents 0 or 1 is represented.
- Za, Zb and Zc each independently represents an atomic group necessary for forming a 5- or 6-membered ring, provided that at least one of the rings formed by Za, Zb and Zc is an acidic group.
- D 1 to D 4 each independently represents a carbon atom or a nitrogen atom.
- R is a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkylamino group, cycloalkylamino.
- R 1 represents a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cyclo
- An alkylthio group, an arylthio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, a silyl group, a silyloxy group, an aryl group, or a heteroaryl group is represented, and R 2 represents a substituent.
- Ar 1 and Ar 2 each independently represent a carbocyclic aromatic group having an anion, a nitrogen-containing aromatic group having a lone pair, or a nitrogen-containing aromatic group having an anion.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group.
- l1 represents 0 or 1
- n1 represents an integer of 0 to 3
- n2 represents an integer of 0 to 4
- r2 represents an integer of 0 to 2.
- Ring A represents a 5-membered or 6-membered cyclic group.
- R and R 1 are not bonded to form a ring.
- the broken line described between the positions where R bonds from the atom of the bond in the above group means that this part may be a single bond or a double bond.
- Zd is a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, perylene ring, pyrrole ring, indole ring, imidazole ring, benzimidazole ring, pyrazole ring, pyrazine ring, pyrimidine ring, benzopyrimidine ring, pyridazine ring, benzo Pyridazine ring, triazole ring, benzotriazole ring, tetrazole ring, indazole ring, triazine ring, purine ring, quinoline ring, isoquinoline ring, quinazoline ring, thiazole ring, benzothiazole ring, isothiazole ring, oxazole ring, isoxazo
- Ze to Zg each represents an atomic group necessary for forming a 5- or 6-membered ring other than the pyridine ring.
- A represents an acidic group.
- Ra represents an aryl group, heteroaryl group, alkyl group, cycloalkyl group, alkoxy group or cycloalkoxy group.
- the alkyl group has a tertiary or quaternary carbon atom
- the alkoxy group has a tertiary or quaternary carbon atom
- the carbon atom directly bonded to the oxygen atom of the alkoxy group is A secondary or tertiary carbon atom.
- R EWG represents an electron-withdrawing group.
- Rb and Rc represent a substituent. a0 represents an integer of 0-2.
- a0 is 1 or 2.
- a1 represents an integer of 1 or 2.
- a2 represents an integer of 1 to 4
- a3 represents an integer of 0 to 3
- a4 represents an integer of 0 to 4.
- the sum of a2 and a3 is an integer of 1 to 4.
- the formulas (B5) to (B8) have at least one acidic group.
- (25) A dye solution obtained by dissolving the metal complex dye described in any one of (22) to (24).
- the dye solution according to claim 25 wherein 0.001 to 0.1% by mass of the metal complex dye is contained in an organic solvent, and water is suppressed to 0.1% by mass or less.
- the dye solution according to (27), wherein the co-adsorbent is represented by the following formula (CA).
- R A1 represents a substituent having an acidic group.
- R A2 represents a substituent.
- NA represents an integer of 0 or more.
- R is a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkylamino group, cycloalkylamino.
- R 1 represents a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cyclo
- An alkylthio group, an arylthio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, a silyl group, a silyloxy group, an aryl group, or a heteroaryl group is represented, and R 2 represents a substituent.
- Ar 1 and Ar 2 each independently represent a carbocyclic aromatic group having an anion, a nitrogen-containing aromatic group having a lone pair, or a nitrogen-containing aromatic group having an anion.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group.
- l1 represents 0 or 1
- n1 represents an integer of 0 to 3
- n2 represents an integer of 0 to 4
- r2 represents an integer of 0 to 2.
- Ring A represents a 5-membered or 6-membered cyclic group. However, R and R 1 are not bonded to form a ring.
- the carbon-carbon double bond may be any of E-type and Z-type in the molecule, or a mixture thereof.
- substituents, etc. linking groups, ligands, etc.
- substituents etc.
- a special notice is given.
- each substituent etc. may mutually be same or different. The same applies to the definition of the number of substituents and the like.
- substituents and the like when a plurality of substituents and the like are close to each other (especially when they are adjacent to each other), they may be connected to each other to form a ring unless otherwise specified.
- a ring such as an alicyclic ring, an aromatic ring, or a hetero ring may be further condensed to form a condensed ring.
- each substituent may be further substituted with a substituent unless otherwise specified.
- a metal complex dye having excellent performance by reducing both the variation in performance and improving the photoelectric conversion efficiency and durability, a metal complex dye having excellent performance, a photoelectric conversion element having excellent performance by using this metal complex dye, and Compounds useful as ligands for dye-sensitized solar cells, dye solutions containing metal complex dyes, and metal complex dyes can be provided.
- FIG. 1 is a cross-sectional view schematically showing an embodiment of the photoelectric conversion element of the present invention, including an enlarged view of a circular portion in a layer.
- FIG. 2 is a cross-sectional view schematically showing the dye-sensitized solar cell created in Examples 1 and 4.
- FIG. 3 is a cross-sectional view schematically showing the dye-sensitized solar cell created in Example 2.
- FIG. 4 is a cross-sectional view schematically showing, in an enlarged portion (circle), a modification of the photoelectric conversion element shown in FIG. 1 for the dye-sensitized solar cell created in Example 3 using a cobalt complex as the electrolyte.
- FIG. 5 is a schematic view of a state in which the metal complex dye is adsorbed on the surface of the semiconductor fine particle via an acidic group.
- FIG. 6 is a schematic diagram showing various orientations of substituents bonded to a cyclic group.
- FIG. 7 is a schematic diagram showing an angle ⁇ ( ⁇ MG1G2) at the ⁇ -position or ⁇ -position of the cyclic group.
- the present invention is a metal complex dye having at least one tridentate ligand having at least one acidic group, and a photoelectric conversion element, a dye-sensitized solar cell having the same, and the metal complex dye described below. It is a compound useful as a ligand for the contained dye solution and metal complex dye. First, the metal complex dye will be described in detail.
- the metal complex dye of the present invention has at least one tridentate ligand having at least one acidic group, and at least one of the ligands coordinated to the metal atom M has an sp2 carbon atom, A cyclic group is bonded to the sp2 carbon atom, and the cyclic group atom directly connected to the sp2 carbon atom at a cyclic position connected by a carbon atom from the cyclic group atom directly connected to the sp2 carbon atom
- a substituent R selected from a group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, a
- the metal complex dye of the present invention is preferably a metal complex dye having an umbrella shape in molecular shape.
- the umbrella-type metal complex dye has a cyclic group at the sp2 carbon atom on the basic skeleton of the ligand (minimum skeleton necessary for coordination) or a conjugated system (conjugated chain), Having a substituent at an atom at the ⁇ -position or ⁇ -position with respect to the atom of the cyclic group directly connected to the sp2 carbon atom, so that the substituent does not move away from the central metal atom but covers the central metal atom Oriented, for example, when irradiated with sunlight from the substituent side, it is oriented not to be a closed parasol, but to block light hitting the central metal atom, such as a parasol that is fully open or partially or open on one side It is what you are doing.
- a metal complex dye having an octahedral structure, a tridentate terpyridine having an acidic group, and a 5- (2-pyridyl) pyrazole skeleton being a bidentate ligand.
- the ligand and the monodentate ligand (X) are coordinated to the Ru metal, the structure is as shown in FIG.
- the ligand of the 5- (2-pyridyl) pyrazole skeleton has a cyclic group (61a) having a substituent R.
- the metal complex dye 61 having the substituent R on the cyclic group 61a is adsorbed on the semiconductor fine particle plane 62 via the acidic group A.
- preferable metal complex dyes are, for example, structures such as 1-1 to 1-5 schematically shown in FIG. 6, and those having a structure such as 2-1 are closed. With a parasol, even if sunlight hits from the tip of the parasol, the shade to the central metal atom is not practical.
- Such metal complex dye molecules substituent (the substituent R in the above example), substituents rather than extending directly above, by extending at an angle, efficiently redox system to the semiconductor fine particles (e.g. I 3 - ) And the reverse electron transfer from the redox system can be prevented.
- the angle ⁇ ( ⁇ MG1G2) formed by the metal atom M, the atom G1, and the atom G2 is specifically as shown in FIG.
- the atom G2 bonded to the ⁇ -position of the cyclic group is the left side of FIG. 7, and the atom G2 bonded to the ⁇ -position is the right side.
- the sp2 carbon atom is shown as Csp2 .
- the ⁇ -position and ⁇ -position of the cyclic group indicate the position of an atom bonded adjacent to the carbon atom of the cyclic group bonded to the sp2 carbon atom, and the cyclic position bonded to the sp2 carbon atom.
- Next to the carbon atom of the group is the ⁇ position, the next is the ⁇ position, and the next is the ⁇ position.
- substitution is made with the atoms of the cyclic group that are ⁇ -position and ⁇ -position at the cyclic position connected by the carbon atom from the atom of the cyclic group directly connected to the sp2 carbon atom, and are directly connected to the sp2 carbon atom.
- the bond between the atoms having a group is a carbon atom or a bond between a carbon atom and a carbon atom.
- the following formula (A-1) has a substituent R at the ⁇ -position of the cyclic group
- the following formula (A-2) has a substituent R at the ⁇ -position of the cyclic group
- R is a specific substituent R of interest in the present invention.
- the angle ⁇ ( ⁇ MG1G2) formed by the metal atom M, the atom G1, and the atom G2 can be obtained by various methods, but the molecule obtained by optimization of the structure in density functional theory calculation (DFT calculation) It is easy to obtain from the structure.
- the density functional theory calculation is performed using lanl2dz as the basis function.
- the most stable structure can be obtained, and the angle ⁇ ( ⁇ MG1G2) can be obtained from the obtained most stable structure.
- Gaussian 09 manufactured by Gaussian was used.
- the angle ⁇ ( ⁇ MG1G2) is 150 ° or less and is not a vector angle, so the maximum angle is 180 °.
- the angle ⁇ ( ⁇ MG1G2) is preferably 120 ° or less, more preferably an acute angle (90 ° or less).
- the angle ⁇ ( ⁇ MG1G2) may be reduced, and it is preferable that the substituent R is bonded to the ⁇ -position of the cyclic group.
- a more preferable molecular structure is that the length of the substituent R in the present invention is longer than 1 ⁇ 2 times the length from the metal atom M to the atom (G1) of the cyclic group substituted by the substituent R.
- the case is preferable, and the case is more preferably longer than 1 time.
- Such a long length of the substituent R makes it possible to more efficiently suppress the redox system (for example, I 3 ⁇ ) from approaching the semiconductor fine particles.
- the maximum number of connected chains (N R ) among the number of connected chains (number of bonds) connecting the atom G1 and the atom located farthest through the connection of the substituent R. ) Is preferably more than 1 ⁇ 2 times the minimum number of linking chains (N M-G1 ) of the number of linking chains (number of bonds) connecting the metal atom M to the atom G1, Preferably it is more than 0.8 times, particularly preferably more than 1 time.
- the number of linking chains differs depending on whether it is clockwise or counterclockwise, but the shorter linking chain number is adopted.
- the substituent R is not condensed with a cyclic group. This is because the effect of covering the dye is drastically reduced when the substituent R is condensed.
- Substituent R is a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkylamino group, cycloalkylamino group, aryl An amino group, a heterocyclic amino group, a silyl group or a silyloxy group.
- the linear or branched alkyl group may have a substituent, and the carbon number is preferably 1 to 30, more preferably 4 to 30, still more preferably 5 to 26, and particularly preferably 6 to 20.
- the cycloalkyl group may have a substituent, and the number of carbon atoms is preferably 3 to 30, more preferably 5 to 30, still more preferably 6 to 26, and particularly preferably 6 to 20.
- Examples include cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.
- the cyclic cycloalkane of the group may be condensed with an alicyclic ring, an aromatic ring or a heterocyclic ring.
- the alkoxy group may have a substituent, and the carbon number is preferably 1 to 30, more preferably 4 to 30, still more preferably 5 to 26, and particularly preferably 6 to 20.
- the cycloalkoxy group may have a substituent, and the carbon number is preferably 3 to 30, more preferably 5 to 30, still more preferably 6 to 26, and particularly preferably 6 to 20.
- Examples include cyclopropyloxy, cyclopentyloxy, cyclohexyloxy, cycloheptyloxy, and cyclooctyloxy.
- the cyclic cycloalkane of the group may be condensed with an alicyclic ring, an aromatic ring or a heterocyclic ring.
- the aryloxy group includes a heteroaromatic ring in which the aryl ring is an aromatic ring, that is, a carbocyclic aromatic ring and a heteroaromatic ring. Accordingly, the aryloxy group is a carbocyclic aryloxy group or a heteroaryloxy group, which may have a substituent, and preferably has 5 to 30 carbon atoms, more preferably 5 to 25, and more preferably 5 to 20 carbon atoms. More preferably, 5 to 16 is particularly preferable.
- Examples include phenoxy, naphthoxy, imidazolyloxy, benzimidazolyloxy, pyridin-4-yloxy, pyrimidinyloxy, quinazolinyloxy, purinyloxy, thiophen-3-yloxy and the like.
- hetero ring of the heteroaryloxy group a thiophene ring is preferable.
- the alkylthio group may have a substituent, and the carbon number is preferably 1 to 30, more preferably 4 to 30, still more preferably 5 to 26, and particularly preferably 6 to 20.
- the cycloalkylthio group may have a substituent, and the number of carbon atoms is preferably 3 to 30, more preferably 5 to 30, still more preferably 6 to 26, and particularly preferably 6 to 20.
- Examples include cyclopropylthio, cyclopentylthio, cyclohexylthio, cycloheptylthio, and cyclooctylthio.
- the cyclic cycloalkane of the group may be condensed with an alicyclic ring, an aromatic ring or a heterocyclic ring.
- the arylthio group includes a heteroaromatic ring in which the aryl ring is an aromatic ring, that is, a carbocyclic aromatic ring and a heteroaromatic ring. Accordingly, the arylthio group is a carbocyclic arylthio group or a heteroarylthio group, which may have a substituent, and preferably has 5 to 30 carbon atoms, more preferably 5 to 25, and even more preferably 5 to 20 carbon atoms. 5 to 16 is particularly preferable.
- Examples include phenylthio, naphthylthio, imidazoylthio, benzimidazolylthio, pyridin-4-ylthio, pyrimidinylthio, quinazolinylthio, purinylthio, thiophen-3-ylthio and the like.
- heterocycle of the heteroarylthio group a thiophene ring is preferable.
- the alkylamino group may have a substituent, preferably has 1 to 30 carbon atoms, and more preferably has 2 to 30 carbon atoms.
- substituents include ethylamino, diethylamino, 2-ethylhexylamino, bis (2-ethylhexyl) amino, n-octadecylamino, and n-octadecylamino.
- the cycloalkylamino group may have a substituent, and the number of carbon atoms is preferably 3 to 30, more preferably 5 to 30, still more preferably 6 to 26, and particularly preferably 6 to 20.
- cyclopropylamino dicyclopropylamino, N-cyclopropyl-N-ethylamino, cyclopentylamino, dicyclopentylamino, N-cyclopentyl-N-methylamino, cyclohexylamino, dicyclohexylamino, cycloheptylamino, cyclooctylamino Is mentioned.
- the cyclic cycloalkane of the group may be condensed with an alicyclic ring, an aromatic ring or a heterocyclic ring.
- the arylamino group includes a heteroaromatic ring in which the aryl ring is an aromatic ring, that is, a carbocyclic aromatic ring and a heteroaromatic ring. Accordingly, the arylamino group is a carbocyclic arylamino group or a heteroarylamino group, which may have a substituent, and preferably has 5 to 30 carbon atoms, more preferably 5 to 25 carbon atoms, and more preferably 5 to 20 carbon atoms. More preferably, 5 to 16 is particularly preferable.
- phenylamino N-phenyl-N-ethylamino, naphthylamino, imidazolylamino, benzimidazolylamino, pyridin-4-ylamino, pyrimidinylamino, quinazolinylamino, purinylamino, thiophen-3-ylamino and the like It is done.
- the heterocyclic amino group is a heterocyclic amino group other than a heteroarylamino group, which may have a substituent, preferably has 0 to 30 carbon atoms, more preferably has 1 to 25 carbon atoms, still more preferably has 2 to 20 carbon atoms, 2 to 16 is particularly preferable.
- the heterocycle is preferably one in which the ring-constituting hetero atom is selected from an oxygen atom, a sulfur atom, and a nitrogen atom, and is preferably a 5- to 7-membered ring, more preferably a 5- or 6-membered ring. preferable.
- Examples include pyrrolidin-3-ylamino, imidazolidinylamino, benzimidazolidinylamino, piperidin-4-ylamino, tetrahydrothiophen-3-ylamino and the like.
- the silyl group includes an alkylsilyl group, a cycloalkylsilyl group, an arylsilyl group, an alkyloxysilyl group, a cycloalkyloxysilyl group, and an aryloxysilyl group, preferably having 3 to 30 carbon atoms, more preferably 3 to 24, 3 to 20 is more preferable, and 3 to 18 is particularly preferable.
- silyl groups an alkylsilyl group, a cycloalkylsilyl group, or an arylsilyl group is preferable.
- Examples include trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, cyclohexyldimethylsilyl, triisopropylsilyl, t-butyldiphenylsilyl, methyldimethoxysilyl, phenyldimethoxysilyl, and phenoxydimethylsilyl.
- the silyloxy group includes an alkylsilyloxy group, a cycloalkylsilyloxy group, and an arylsilyloxy group, preferably has 3 to 30 carbon atoms, more preferably 3 to 24, still more preferably 3 to 20, and particularly preferably 3 to 18.
- Examples thereof include trimethylsilyloxy, triethylsilyloxy, t-butyldimethylsilyloxy, triisopropylsilyloxy, cyclohexyldimethylsilyloxy, and t-butyldiphenylsilyloxy.
- linear or branched alkyl groups, cycloalkyl groups, alkoxy groups, cycloalkoxy groups, alkylthio groups, cycloalkylthio groups, amino groups, alkylamino groups, cycloalkylamino groups, and arylamino groups are preferred.
- a linear or branched alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an alkylamino group, a cycloalkylamino group, and an arylamino group are more preferable, and a linear or branched alkyl group, an alkoxy group, and an alkylamino group are more preferable. More preferred are linear or branched alkyl groups and alkoxy groups.
- those having two or more substituents R in a cyclic group are preferable, and those having a plurality of ⁇ -positions or ⁇ -positions preferably have substituents R in a plurality of ⁇ -positions or ⁇ -positions.
- the substituent R is not condensed with the cyclic group.
- the substituent R is in the ⁇ -position or ⁇ -position of the cyclic group bonded to the sp2 carbon atom.
- examples of the cyclic group include saturated, unsaturated, or aromatic carbocycles, and heterocycles including heteroaromatic rings.
- the hetero ring is preferably a nitrogen atom, a sulfur atom or an oxygen atom as the hetero atom of the ring constituent atom.
- the cyclic group is preferably a cycloalkyl group, a cycloalkenyl group, an aryl group, or a heterocyclic group. These rings may have a substituent, and may be condensed with another ring or the same ring.
- the cyclic group can be designed freely because the orientation of the substituent R, that is, the angle ⁇ ( ⁇ MG1G2) is fixed and the probability of taking a desired angle is improved.
- the cycloalkyl group is preferably a 3- to 7-membered cycloalkyl group, and examples thereof include cyclopropyl, cyclopentyl, cyclohexyl, and cycloheptyl.
- the cycloalkenyl group is preferably a 5- to 7-membered cycloalkenyl group, and examples thereof include cyclohepentenyl, cyclohexenyl, and cycloheptenyl.
- aryl group examples include phenyl and naphthyl.
- heterocyclic group those having at least one oxygen atom, sulfur atom or nitrogen atom as the ring constituting atom are preferred, and a 5- to 7-membered heterocyclic group is preferred.
- heterocyclic ring in the heterocyclic group examples include a thiophene ring, a furan ring, a pyrrole ring, an imidazole ring, a pyrazole ring, a pyridine ring, a pyrazine ring, a pyridazine ring, a tetrahydrothiophene ring, a tetrahydrofuran ring, a pyrrolidine ring, a pyrroline ring, and an imidazolidine.
- the cyclic group is preferably an aromatic ring, more preferably an aryl group (carbocyclic aromatic ring group) or a heteroaromatic ring group.
- preferred groups are cyclohexyl, phenyl, and groups in which the heterocycle is thiophene (particularly 2-thienyl), more preferably phenyl, thiophene, and particularly preferably phenyl.
- the basic skeleton of the ligand has at least one sp2 carbon atom
- the sp2 carbon atom is a conjugated linkage that links a ring-forming atom or an aromatic ring and a cyclic group. It is preferably a carbon atom of a group (for example, ethenylene group, ethynylene group, arylene group, heteroarylene group or a linking group in which these are repeated), and more preferably an atom that forms a ring from the viewpoint of durability due to nucleophilic species. is there.
- Examples of the ring formed together with the sp2 carbon atom include the above cyclic groups.
- a substituent for example, an amino group, a hydroxyl group, an anionic group, etc.
- the ring formed preferably contains an atom coordinated with the metal atom M.
- the cyclic group in which the formed ring includes an atom that coordinates with the metal atom M is preferably a hetero ring group, more preferably a 5- or 6-membered heterocyclic group, and an atom that coordinates with the metal atom M.
- a heterocycle in which is a nitrogen atom is more preferred.
- an aromatic nitrogen-containing heterocycle is preferable, and examples thereof include a pyrrole ring, an imidazole ring, a pyrazole ring, a triazole ring, a tetrazole ring, a pyridine ring, a pyrazine ring, an indole ring, and an indazole ring.
- These rings are preferably those in which two heterocycles are bonded as ligands, and those in which three heterocycles are bonded, and those that are bonded to other aromatic rings are preferable.
- the other aromatic ring examples include an aryl ring, a heteroaromatic ring, and an aryl ring or heteroaromatic ring having an anion formed therefrom.
- an aromatic nitrogen-containing heterocycle and at least one aryl ring Particularly preferred are those which bind to an anion or an aromatic heterocyclic anion (the anion is an anion of a cyclic constituent atom and coordinates to the metal atom M).
- a bidentate ligand or a tridentate ligand is preferable, and a tridentate ligand is more preferable from the viewpoint of suppressing elimination of the ligand.
- the plurality of sp2 carbon atoms may have a cyclic group.
- the number of sp2 carbon atoms having a cyclic group as described above is preferably 1 or 2, and more preferably 1.
- the sp2 carbon atom is preferably an ethylene carbon atom in an ethylene structure conjugated with a carbon atom constituting a ring or an aromatic ring.
- the acidic group is a substituent having a dissociative proton, and pKa is 11 or less.
- an acid group that is an acid group such as a carboxy group, a phosphonyl group, a phosphoryl group, a sulfo group, or a boric acid group, or a group having any of these, preferably a carboxy group or It is a group having this.
- the acidic group may take a form of releasing a proton and dissociating, or may be a salt.
- the acidic group may be a group in which an acid group is bonded through a linking group.
- the linking group includes an alkylene group, an alkylene group, an alkenylene group, an arylene group, a divalent heterocyclic group, and a combination thereof. Groups.
- the alkylene group has 1 to 4 carbon atoms
- the alkenylene group has 2 to 4 carbon atoms
- the alkynylene group has 2 to 4 carbon atoms
- the arylene group has 6 to 12 carbon atoms
- a divalent heterocyclic group Each preferably has 0 to 12 carbon atoms.
- the counter ion when the salt is converted is not particularly limited, but examples include a positive ion represented by a counter ion CI in the formula (I) described later.
- an acidic group that does not involve a linking group is preferable from the viewpoint of electron transfer, and a carboxy group is particularly preferable.
- the central metal in the metal complex dye is a metal capable of tetracoordinate or hexacoordinate, and more preferably Ru, Fe, Os, Cu, W, Cr, Mo, Ni, Pd, Pt, Co, Ir, Rh. , Re, Mn or Zn, more preferably Ru, Os, Fe or Cu, particularly preferably Ru or Os, and most preferably Ru.
- a preferable metal complex dye can be represented by the following formula (I).
- M represents Ru or Os
- LD represents a bidentate or tridentate ligand represented by the following formula (A)
- LA represents a tridentate coordination represented by the following formula (B).
- X represents a monodentate ligand
- CI represents a counter ion when a counter ion is required to neutralize the charge.
- m1 represents 1 or 2
- m2 represents 1
- m3 represents 0 or 1.
- Cy represents a cyclic group
- R represents a linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group
- R 1 represents a linear or branched alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl Oxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino group, heterocyclic amino group, silyl group, silyloxy group, silyloxy
- Ar 1 and Ar 2 each independently represent a carbocyclic aromatic group having an anion, a nitrogen-containing aromatic ring group having a lone pair, or a nitrogen-containing aromatic group having an anion.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group.
- n1 represents an integer of 0 to 3
- n2 represents an integer of 0 to 4
- n3 represents 1 or 2
- r1 represents an integer of 1 to 3
- r2 represents an integer of 0 to 2
- l1 represents 0 or 1 is represented.
- Za, Zb, and Zc each independently represent an atomic group necessary for forming a 5- or 6-membered ring. However, at least one of the rings formed by Za, Zb and Zc has an acidic group.
- Q 1 to Q 3 each independently represent a nitrogen atom having a lone pair, a nitrogen atom having an anion, or a carbon atom having an anion.
- D 1 to D 4 each independently represents a carbon atom or a nitrogen atom.
- the ligand LD is classified as a donor ligand and is represented by the formula (A).
- R is the substituent R in the present invention
- Cy is the aforementioned cyclic group
- n1 is 0, the sp2 carbon atom is the carbon atom on the pyridine ring substituted by Cy, and n1 is 1 to 3 In some cases, the sp2 carbon atom is the L sp2 carbon atom.
- R 1 linear or branched alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, aryloxy group, alkylthio group, cycloalkylthio group, arylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino
- the aromatic group includes a carbon ring and a heteroaromatic ring, and is preferably a phenyl group or a thienyl group which may have a substituent.
- the cyclic group in Cy is the above-described cyclic group, and is preferably a 3- to 8-membered ring.
- the ring is preferably a cycloalkane, a cycloalkene, an aryl ring, or a heterocycle, and these rings have a substituent. It may have, and may be condensed with another ring or the same ring.
- the ring is preferably an aromatic ring (carbon-based aromatic ring or heteroaromatic ring). In particular, a benzene ring and a thiophene ring are preferable, and those in which a heterocycle or an aromatic ring is condensed to these rings are also preferably included.
- Cy is preferably a group represented by the following formula (A-1) or (A-2).
- R and R 1 are as defined in the formula (A).
- Ring A and ring B represent a 5-membered or 6-membered cyclic group.
- R and R 1 are not bonded to form a ring.
- R 1 When a plurality of R 1 are present, they may be bonded to each other and condensed.
- the broken line described between the positions where R is bonded from the atom of the above-mentioned bond means that this part may be a single bond or a double bond.
- Rings A and B are preferably a thiophene ring or a benzene ring.
- L represents an ethenylene group, an ethynylene group, an arylene group, or a heteroarylene group, where the arylene group is a divalent aromatic carbocyclic group, and examples thereof include phenylene and naphthylene, and a heteroaryl ring in a heteroarylene group.
- a ring-constituting hetero atom such as an oxygen atom, a sulfur atom (—S—, —SO—, —SO 2 —), a nitrogen atom, a silicon atom, or a selenium atom.
- the ring may be condensed with an alicyclic ring, an aromatic ring, or a heterocyclic ring.
- Examples of the ring include a thiophene ring, a benzothiophene ring, a furan ring, a pyridine ring, and a formula (B) described later.
- Examples thereof include a ring formed by Za to Zc and a ring exemplified by a heteroaryl ring among the rings formed by Zd represented by formula (B4).
- Ar 1 and Ar 2 are preferably a nitrogen-containing aromatic group having an anion or a nitrogen-containing aromatic ring group having a lone pair, and more preferably a nitrogen-containing aromatic group having an anion.
- the aromatic carbocycle includes a benzene ring and a naphthalene ring
- the nitrogen-containing aromatic ring includes a nitrogen atom alone, a nitrogen atom, an oxygen atom, as a ring-constituting hetero atom, It may contain any of a sulfur atom (—S—, —SO—, —SO 2 —), a silicon atom, and a selenium atom
- the number of ring members is preferably a 5- to 7-membered ring, which is an alicyclic ring, aromatic ring, or heterocyclic ring
- the ring may be condensed, and examples of the ring include a thiophene ring, a benzothiophene ring, a furan ring, a pyridine ring, a ring formed by Za to Zc represented by the following formula (B), a formula ( The ring mentioned by the nitrogen-containing heteroaryl ring among the rings formed
- At least one of the ring constituent atoms is preferably an anion.
- These anions are preferably coordinated with or capable of coordinating with the metal atom M.
- the lone electron pair in the nitrogen-containing aromatic ring group having a lone electron pair is not a ⁇ electron on the aromatic ring but a lone electron pair that does not participate in bonding.
- At least one nitrogen atom of the nitrogen-containing aromatic ring is a nitrogen atom having a lone pair of electrons, and examples thereof include nitrogen atoms such as imidazole ring, thiazole ring, benzimidazole ring, benzothiazole ring, pyridine ring, quinoline ring, A pyridine ring is preferred.
- these rings may be condensed with an alicyclic ring, an aromatic ring or a heterocyclic ring.
- the nitrogen-containing aromatic group having an anion is preferably a group represented by any of the following formulas (a-1) to (a-5): (a-1), (a-2) or (a-5)
- the group represented by (a-2) is particularly preferred.
- Rd is an alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, alkylthio group, cycloalkylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino group, heterocyclic amino group, halogen atom,
- a cyano group, an alkoxycarbonyl group, a cycloalkoxycarbonyl group or an aromatic group is represented.
- b1 represents an integer of 0 to 2
- b2 represents an integer of 0 to 3
- b3 represents an integer of 0 or 1.
- an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an alkylthio group, a cycloalkylthio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, and a heterocyclic amino group are substituted with the substituent R.
- the halogen atom is preferably a fluorine atom, a chlorine atom or a bromine atom
- the alkoxycarbonyl group preferably has 2 to 30 carbon atoms.
- the aromatic group includes An aromatic carbocyclic group and a heteroaryl group are mentioned, and the ring of the group mentioned by the arylene group and heteroarylene group mentioned by L in the said Formula (A) is mentioned.
- L is a divalent group, but is a group in which the ring mentioned in L is monovalent.
- Rd is preferably a linear or branched alkyl group, a cycloalkyl group, an aromatic group, a halogen atom, an alkoxycarbonyl group or a cycloalkoxycarbonyl group, more preferably a linear or branched alkyl group, a cycloalkyl group, An aromatic group, particularly preferably a linear or branched alkyl group or a cycloalkyl group.
- These groups may have a substituent, and examples thereof include a substituent T described later.
- alkyl group examples include methyl, butyl, hexyl, 2-ethylhexyl, t-butyl and trifluoromethyl groups.
- Preferred examples of the aromatic group include phenyl, pentafluorophenyl, 1-naphthyl and 2-thienyl.
- Rd and b1 to b3 have the same meanings as formulas (a-1) to (a-5), and preferred ranges are also the same.
- b4 represents an integer of 0 to 4
- b5 represents an integer of 0 to 5.
- Rd represents not only a benzene ring but also a pyrrole ring.
- l1 is preferably 1.
- the ligand (compound) represented by the formula (A) is a ligand in which l1 is 1 and both Ar 1 and Ar 2 are heteroaromatic groups having anions.
- both Ar 1 and Ar 2 are particularly preferably the formula (a-2).
- the ligand (compound) represented by the formula (A) is preferably a ligand (compound) represented by the following formula (A-3), more preferably the following formula (A-4) or A ligand (compound) represented by the following formula (A-5), and more preferably a ligand (compound) represented by the following formula (A-5) from the viewpoint of heat resistance.
- Ar 1 , Ar 2 , R, R 1 , R 2 , L, 11, n 1, n 2, r 2, and ring A are as defined in the above formulas (A) and (A-1).
- R, R 1 , n1 and n2 have the same meaning as in the formula (A).
- Ring A is as defined in the above formulas (A) and (A-1).
- Rd is alkyl group, cycloalkyl group, alkoxy group, cycloalkoxy group, alkylthio group, cycloalkylthio group, amino group, alkylamino group, cycloalkylamino group, arylamino group, heterocyclic amino group, halogen atom, cyano group Represents an alkoxycarbonyl group, a cycloalkoxycarbonyl group or an aromatic group.
- B1 represents an integer of 0-2.
- b1 2
- two Rd's may be bonded to each other to form a ring.
- R, R 1 , n1 and n2 have the same meaning as in the formula (A).
- Ring A is as defined in the above formulas (A) and (A-1).
- Rd and b1 have the same meanings as those in formula (A-4).
- the ligand (compound) represented by the formula (A-4) can be obtained by anionizing a compound represented by the following formula (A-4 ′).
- R, R 1 , Rd, L, b1, n1, n2 and ring A are as defined in the above formula (A-3).
- the ligand (compound) represented by the formula (A-5) can be obtained by anionizing a compound represented by the following formula (A-5 ′).
- R, R 1 , Rd, L, b1, n1, n2 and ring A are as defined in the above formula (A-3).
- the ligand LD is preferably one having no acidic group in the compound.
- the ligand (compound) represented by the formula (A) are shown below, but the present invention is not limited thereto.
- the nitrogen atom —NH— moiety of the nitrogen-containing heterocycle represents —N ⁇ —.
- Ligand LD represented by the formula (A) is disclosed in US Patent Application Publication No. 2010 / 0258175A1, Japanese Patent No. 4298799, Angew. Chem. Int. Ed. , 2011, 50, 2054-2058, a method described in a reference cited in the document, or a method according to these methods.
- the ligand LA is classified as an acceptor ligand and is represented by the following formula (B).
- Za, Zb, and Zc each independently represent an atomic group necessary for forming a 5- or 6-membered ring. However, at least one of the rings formed by Za, Zb and Zc has an acidic group.
- Q 1 to Q 3 each independently represent a nitrogen atom having a lone pair, a nitrogen atom having an anion, or a carbon atom having an anion.
- D 1 to D 4 each represents a carbon atom or a nitrogen atom.
- the ring formed by Za, Zb and Zc is a 5-membered ring or a 6-membered ring, but the formed ring is Q 1 to Q 3 and any ring can be coordinated with the metal atom M. I do not care.
- the bond between Q 1 and D 1, the bond between D 2 and Q 2 , the bond between D 3 and Q 2, and the bond between D 4 and Q 3 are indicated by “ ⁇ ” for convenience.
- the ring formed by Za, Zb and Zc may be an aromatic ring or a ring other than an aromatic ring (for example, an aliphatic saturated ring or an unsaturated ring which is not aromatic, or a hetero ring which is not aromatic). ), But an aromatic ring is preferred.
- Aromatic rings include aromatic carbocycles and aromatic heterocycles (heteroaryl rings). Among these, an aromatic heterocycle is preferable.
- a 6-membered ring is preferable, and in the case of an aromatic heterocycle, a 5- or 6-membered ring is preferable.
- the ring formed by Za, Zb and Zc may be unsubstituted or may have a substituent, but at least two of the rings formed by Za, Zb and Zc have an acidic group.
- a substituent the below-mentioned substituent T is mentioned.
- the ring formed by Za, Zb and Zc may be a single ring or condensed with an aliphatic saturated, unsaturated or aromatic ring, or an aromatic or non-aromatic heterocycle.
- the ring having the carbon atom having an anion as a ring atom is preferably an aliphatic ring, and more preferably an aromatic carbocycle.
- a ring examples include a cyclopentadiene ring, a benzene ring, and a naphthalene ring, and a benzene ring is preferable.
- hetero rings other than nitrogen-containing hetero rings are exemplified, such as furan ring, benzo [b] furan ring, thiophene ring, benzo [b] thiophene ring, naphthothiophene ring, thianthracene ring. , Tetrahydrofuran ring, tetrahydropyran ring, 4H-pyran ring.
- the nitrogen-containing heterocycle formed together with the nitrogen atom or nitrogen anion having a lone electron pair as a ring-constituting atom includes a ring
- the constituent hetero atom may include only a nitrogen atom, or may include an oxygen atom and a sulfur atom (for example, —S—, SO—, —SO 2 —, phosphorus atom, silicon atom, and selenium atom together with the nitrogen atom).
- the ring formed may be an aromatic ring or a non-aromatic heterocycle, a heteroaromatic ring is preferred.
- the ring formed is preferably a 6-membered heteroaromatic ring, and if it is a nitrogen anion, the formed ring is A 5-membered heteroaromatic ring is preferred.
- the nitrogen anion when any of Q 1 to Q 3 is a nitrogen anion, when incorporating as a ligand in the metal complex dye, the nitrogen anion incorporates —NH— as —N — —.
- nitrogen-containing heteroaromatic ring examples include a pyrrole ring, a pyrazole ring, an imidazole ring, a triazole ring, a tetrazole ring, an oxazole ring, a thiazole ring, an isoxazole ring, an isothiazole ring, a furazane ring, a pyridine ring, a pyridazine ring, and a pyrimidine ring.
- Nitrogen-containing heterocycles other than heteroaromatic rings include pyrrolidine ring, pyrroline ring, pyrazoline ring, pyrazoline ring, imidazolidine ring, imidazoline ring, piperazine ring, piperidine ring, morpholine ring, phenothiazine ring, phenoxazine ring, 1,4 A dihydropyridine ring, a tetradehydromorpholine ring or a tetradehydrothiomorpholine ring.
- the nitrogen-containing heterocycle (including a heteroaromatic ring) may be coordinated with a ring carbon atom as an anion without being coordinated with the metal atom M and the nitrogen atom or its anion.
- the nitrogen-containing heterocycle formed together with the nitrogen atom or nitrogen anion having a lone electron pair as a ring-constituting atom is preferably Benzimidazole ring, benzothiazole ring, pyrrole ring, pyrazole ring, triazole ring, pyridine ring, pyrimidine ring, pyridazine ring, pyrazine ring or quinoline ring, more preferably benzothiazole ring, benzimidazole ring, quinoline ring, pyrazole ring Or a pyridine ring, more preferably a pyridine ring or a quinoline ring, and most preferably a pyridine ring.
- At least one of the rings formed by Za, Zb and Zc has an acidic group.
- the number of acidic groups is preferably 2 to 6, more preferably 2 to 4, more preferably 2 to 3, and most preferably 3.
- the acidic group has the same meaning as described above, and the preferred range is also the same.
- the acidic group may be directly substituted on the ring formed by Za to Zc, or may be a group bonded through a linking group.
- the ring formed by Za to Zc is a pyridine ring
- those having an acidic group at the p-position with respect to the nitrogen atom of the pyridine ring are preferable.
- L2 is preferably 1.
- D 1 to D 4 each represents a carbon atom or a nitrogen atom, and those in which D 2 and D 3 are carbon atoms are preferred.
- D 2 and D 3 are carbon atoms
- D 1 or / and D 4 are nitrogen atoms are also preferred.
- the ring formed by Za and Q 1 or Zc and Q 4 is preferably a pyrazole ring, a triazole ring or a pyridine ring.
- the ligand LA represented by the formula (B) is preferably a compound represented by any of the following formulas (B1) to (B8).
- Q 1 to Q 3 and D 1 to D 4 are as defined in the formula (B).
- Zd is a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, perylene ring, pyrrole ring, indole ring, imidazole ring, benzimidazole ring, pyrazole ring, pyrazine ring, pyrimidine ring, benzopyrimidine ring, pyridazine ring, benzo Pyridazine ring, triazole ring, benzotriazole ring, tetrazole ring, indazole ring, triazine ring, purine ring, quinoline ring, isoquinoline ring, quinazoline ring, thiazole ring, benzothiazole ring, isothiazole ring, oxazole ring, isoxazole ring, benzo Oxazole ring, furan ring, benzo [b] furan ring,
- the ring formed by Zd is preferably an aromatic ring (aromatic carbocyclic ring or heteroaromatic ring), and the aromatic ring is preferably a benzimidazole ring, a benzothiazole ring, a thiophene ring, a pyrrole ring, a pyrazole ring, or a triazole. Ring, pyrimidine ring, pyridazine ring, pyrazine ring, quinoline ring or benzene ring.
- a benzothiazole ring, a benzimidazole ring, a quinoline ring, a pyrazole ring, a triazole ring or a benzene ring is preferable
- a benzothiazole ring, a benzimidazole ring, a triazole ring and a triazine ring are particularly preferable
- a quinoline ring is most preferable.
- Ze to Zg represent an atomic group necessary for forming a 5- or 6-membered ring other than the pyridine ring.
- Zf and Zg have the same preferred range as Zd.
- the ring formed by Ze is preferably an aromatic ring, and the aromatic ring is preferably a benzene ring, a naphthalene ring, a thiophene ring, a pyrrole ring, a pyrazole ring, a triazole ring, a pyrazine ring or a triazine ring, and among them, a pyrimidine A ring, a pyrazine ring, a pyrazole ring, a triazole ring or a benzene ring is preferable, a triazole ring or a benzene ring is particularly preferable, and a triazole ring is most preferable.
- the ring formed by Zd to Zg may have a substituent, and examples of the substituent include the substituent T described below.
- A represents an acidic group.
- the acidic group is the acidic group described above, and the preferred range is also the same.
- Ra represents an aryl group, heteroaryl group, alkyl group, cycloalkyl group, alkoxy group or cycloalkoxy group.
- Ra is preferably an aryl group, heteroaryl group, alkyl group, or cycloalkyl group, more preferably an aryl group having the substituent R, or a heteroaryl group having the substituent R, particularly preferably the substituted A heteroaryl group having the group R; It can be considered that these bulky Ras suppress the association of the dyes so that the electron injection into the semiconductor fine particles proceeds efficiently and the short circuit current density (Jsc) is improved.
- the carbon number of the aryl group is preferably 6 to 20, more preferably 6 to 16, particularly preferably 6 to 14, and most preferably 6 to 10, and the benzene ring is most preferable.
- the number of atoms other than hydrogen atoms in the heteroaryl group is preferably 5 to 30, more preferably 5 to 25, still more preferably 5 to 20, particularly preferably 5 to 12, and the thiophene ring is most preferable.
- the alkyl group contains a tertiary or quaternary carbon atom, and preferably contains a quaternary carbon atom from the viewpoint of preventing association due to bulkiness.
- the number of carbon atoms is preferably 4 to 30, more preferably 6 to 28, still more preferably 6 to 26, and particularly preferably 6 to 20.
- the carbon number of the cycloalkyl group is preferably 3 to 30, more preferably 5 to 28, still more preferably 6 to 26, and particularly preferably 6 to 20.
- alkyl group and cycloalkyl group examples include t-butyl, i-pentyl, isohexyl, isooctyl, 2-ethylhexyl, isodecyl, isodecyl, isooctacosyl, cyclopropyl, cyclopentyl, cyclohexyl and adamantyl.
- the alkoxy group contains a tertiary or quaternary carbon atom, or a secondary or tertiary carbon atom directly bonded to an oxygen atom of the alkoxy group, and a quaternary carbon atom from the viewpoint of preventing association due to bulkiness. And a tertiary carbon atom which is directly bonded to the oxygen atom of the alkoxy group.
- the number of carbon atoms of the alkoxy group is preferably 3 to 30, more preferably 4 to 30, still more preferably 4 to 26, and particularly preferably 4 to 20.
- the number of carbon atoms of the cycloalkoxy group is preferably 3 to 30, more preferably 5 to 28, still more preferably 6 to 26, and particularly preferably 6 to 20.
- alkoxy group and cycloalkoxy group examples include i-propoxy, i-butoxy, t-butoxy, i-pentoxy, i-octyloxy, 2-ethylhexyloxy, isodecyloxy, isohexadecyloxy, and isooctacosyloxy. , Cyclopropyloxy, cyclopentyloxy, cyclohexyloxy.
- Rb and Rc represent a substituent.
- substituents include the substituent T described later.
- R EWG represents an electron-withdrawing group.
- Examples of the electron withdrawing group include substituents having an -I effect and an -M effect.
- electron withdrawing groups attenuate the electron density at specific positions in the molecule.
- the electron withdrawing property or electron donating property cannot be explained only by the difference in electronegativity.
- the induction effect and the mesomery effect act in a complex manner, and the appearance changes depending on the presence of aromaticity, conjugated system, and topological positional relationship.
- Hammett's rule is known as an empirical rule for quantitatively evaluating and predicting these effects based on the acid dissociation constants of para- and meta-substituted benzoic acids.
- the electron withdrawing property is represented as -I effect
- the electron donating property is represented as + I effect.
- An atom having a higher electronegativity than carbon exhibits an -I effect.
- An anion shows a + I effect, and a cation shows a -I effect.
- the electron withdrawing property is represented as -M effect, and the electron donating property is represented as + M effect.
- Examples of electron withdrawing groups include the following.
- R ⁇ is a substituent, typically an alkyl group.
- R ⁇ is a hydrogen atom or a substituent, and the substituent is typically an alkyl group.
- the above groups may be directly bonded or may be bonded via a conjugated system such as an aromatic ring (aromatic carbocyclic ring or aromatic heterocyclic ring), an ethynyl group, or an ethenyl group.
- a halogenated phenyl group a cyanophenyl group, a trifluoromethylphenyl group and the like can be mentioned.
- a group having a ⁇ p of 0 or more in Hammett's rule is also exemplified as a specific group.
- An electron-withdrawing group other than an acidic group is preferable, and a fluoroalkyl group (for example, a perfluoroalkyl group such as trifluoromethyl) and a halogen atom are also preferable.
- a cyano group is preferred.
- A0 represents an integer of 0-2. However, in each of Formula (B1) and Formula (B2), at least one of a0 is 1 or 2.
- A1 represents an integer of 1 or 2.
- A2 represents an integer of 1 to 4
- a3 represents an integer of 0 to 3
- a4 represents an integer of 0 to 4.
- the sum of a2 and a3 is an integer of 1 to 4.
- Ra, Rb, REWG , and Rc may be bonded to each other to form a ring.
- the ring formed is preferably an aromatic ring.
- the ligand represented by the formula (B1) is preferable from the viewpoint of the adsorptive power to the surface of the semiconductor fine particles.
- the ligand represented by the formula (B2) is preferable from the viewpoint of the short circuit current density (Jsc).
- the ligand represented by the formula (B3) or the formula (B4) is preferable from the viewpoint of solution stability of the obtained metal complex dye.
- the compounds represented by the formulas (B5) to (B8) are preferable from the viewpoint of the adsorption rate from the surface of the semiconductor fine particles.
- tBu represents a t-butyl group
- n-Bu represents an n-butyl group
- Ph represents a phenyl group (—C 6 H 5 ).
- the ligand LA represented by the formula (B) can be easily synthesized by the same method as the ligand LD represented by the formula (A).
- -Ligand X- X represents a monodentate ligand, an acyloxy anion, an acylthio anion, a thioacyloxy anion, a thioacylthio anion, an acylaminooxy anion, a thiocarbamate anion, a dithiocarbamate anion, a thiocarbonate anion, a dithiocarbonate anion, An anion selected from the group consisting of a thiocarbonate anion, an acyl anion, a thiocyanate anion, an isothiocyanate anion, a cyanate anion, an isocyanate anion, a cyano anion, an alkylthio anion, an arylthio anion, an alkoxy anion and an aryloxy anion, or a group thereof.
- Coordinating monodentate ligands, or halogen atoms, cyano, carbonyl, dialkyl ketones, carbonamides, thiocarbonamides and Anions consisting of thiourea, atom or compound include monodentate ligand selected from the group of (anions hydrogen atoms containing compounds substituted).
- monodentate ligand selected from the group of (anions hydrogen atoms containing compounds substituted).
- the ligand X contains an alkyl group, an alkenyl group, an alkynyl group, an alkylene group or the like, these may be linear or branched, and may be substituted or unsubstituted.
- an aryl group, a heterocyclic group, a cycloalkyl group, etc. are included, they may be substituted or unsubstituted, and may be monocyclic or condensed.
- X is preferably a cyanate anion, an isocyanate anion, a thiocyanate anion, an isothiocyanate anion, a selenocyanate anion or an isoselenocyanate anion, more preferably an isocyanate anion, an isothiocyanate anion or an isoselenocyanate anion, and an isothiocyanate anion. Particularly preferred.
- -Metal atom M- M is a central metal of the metal complex dye and represents Ru or Os in the formula (I), but Ru is preferred in the present invention.
- -Charge neutralization counter ion CI- CI in formula (I) represents a counter ion when a counter ion is required to neutralize the charge.
- a dye is a cation or an anion, or has a net ionic charge, depends on the metal, ligand and substituent in the metal complex dye.
- the metal complex dye represented by the formula (I) may be dissociated and have a negative charge because the substituent has a dissociable group. In this case, the charge of the entire metal complex dye represented by the formula (I) is electrically neutralized by CI.
- the counter ion CI is a positive counter ion
- the counter ion CI is an inorganic or organic ammonium ion (eg, tetraalkylammonium ion, pyridinium ion, etc.), phosphonium ion (eg, tetraalkylphosphonium ion, alkyltriphenylphosphonium ion). Etc.), alkali metal ions or protons.
- the counter ion CI may be an inorganic anion or an organic anion.
- a halogen anion eg, fluoride ion, chloride ion, bromide ion, iodide ion, etc.
- substituted aryl sulfonate ion eg, p-toluene sulfonate ion, p-chlorobenzene sulfonate ion, etc.
- aryl disulfone Acid ions for example, 1,3-benzenedisulfonate ion, 1,5-naphthalenedisulfonate ion, 2,6-naphthalenedisulfonate ion, etc.
- alkyl sulfate ions for example, methyl sulfate ion
- sulfate ions thiocyanate ions Perchlorate ion
- ionic polymer or another dye having a charge opposite to that of the dye may be used as the charge balance counter ion, and a metal complex ion (for example, bisbenzene-1,2-dithiolatonickel (III)) can also be used.
- CI is preferably an inorganic or organic ammonium ion, particularly tetrabutylammonium ion, sodium ion or proton.
- -M1-m3- M1 in the formula (I) represents 1 or 2, and 1 is preferable.
- M2 in the formula (I) represents 1.
- M3 in the formula (I) represents 0 or 1, and 0 is preferable.
- CI in the formula (I) is marked as a proton, but may be tetrabutylammonium ion ( + NBu 4 ), sodium ion, or the like.
- Bu represents a butyl group and t Bu represents a t-butyl group.
- the metal complex dyes of the present invention are disclosed in JP-A No. 2001-291534, a method according to the method cited in the gazette, Chem. Commun. , 2009, 5844-5846, and can be easily synthesized.
- the maximum absorption wavelength in the solution is preferably in the range of 300 to 1000 nm, more preferably in the range of 350 to 950 nm, and particularly preferably in the range of 370 to 900 nm.
- the metal complex dye of the present invention may be used in combination with another dye.
- the dye to be used in combination include Japanese Patent No. 3731852, Japanese Patent Publication No. 2002-512729, Japanese Patent Application Laid-Open No. 2001-59062, Japanese Patent Application Laid-Open No. 2001-6760, Japanese Patent No. 3430254, Japanese Patent Application Laid-Open No. 2003-212851, International Publication No. 2007/91525.
- the squarylium cyanine dyes described in each of the above publications such as JP 2004-063274, JP 2005-123033, JP 2007-287694, JP 2008-71648, JP 2007-287694, and International Publication No. 2007.
- the dye used in combination is preferably a Ru complex dye, a squarylium cyanine dye, or an organic dye.
- the ratio of the mass of the metal complex dye of the present invention to the mass of the other dye is preferably 95/5 to 10/90, and 95/5 to 50/50. Is more preferable, 95/5 to 60/40 is further preferable, 95/5 to 65/35 is particularly preferable, and 95/5 to 70/30 is most preferable.
- the photoelectric conversion element 10 of the present invention includes a conductive support 1, a photoreceptor layer 2 containing semiconductor fine particles sensitized by a dye (metal complex dye) 21, a positive electrode It consists of a charge transfer layer 3 and a counter electrode 4 which are hole transport layers.
- a co-adsorbent is adsorbed on the semiconductor fine particles 22 together with the dye (metal complex dye) 21.
- the conductive support 1 provided with the photoreceptor layer 2 functions as a working electrode in the photoelectric conversion element 10.
- the photoelectric conversion element 10 is shown as a system 100 using a dye-sensitized solar cell that can be used for a battery for causing the operating means M to work with the external circuit 6.
- the light-receiving electrode 5 includes the conductive support 1 and the photoreceptor layer 2 including the semiconductor fine particles 22 adsorbed with the dye (metal complex dye) 21.
- the light receiving electrode 5 is shown as including an electrolyte, but the electrolyte may not necessarily be included.
- the photoreceptor layer 2 is designed according to the purpose, and may be a single layer structure or a multilayer structure.
- the dye (metal complex dye) 21 in at least one photosensitive layer may be one kind or a mixture of various kinds, but at least one of them uses the metal complex dye of the present invention described above.
- the light incident on the photoreceptor layer 2 excites the dye (metal complex dye) 21.
- the excited dye has high energy electrons, and the electrons are transferred from the dye (metal complex dye) 21 to the conduction band of the semiconductor fine particles 22 and reach the conductive support 1 by diffusion.
- the dye (metal complex dye) 21 is an oxidant
- the electrons on the electrode work in the external circuit 6 and the oxidant of the dye (metal complex dye) 21 passes through the counter electrode 4.
- the photoreceptor layer 2 that exists (preferably, an electrolyte that coexists with this oxidant is present), it functions as a solar cell.
- the charge transfer layer used in the photoelectric conversion element of the present invention is a layer having a function of replenishing electrons to the dye oxidant, and is provided between the light receiving electrode and the counter electrode (counter electrode).
- Typical examples include a liquid electrolyte in which a redox couple is dissolved in an organic solvent, a so-called gel electrolyte in which a polymer matrix is impregnated with a liquid in which a redox couple is dissolved in an organic solvent, and a molten salt containing the redox couple. It is done.
- a liquid electrolyte is preferable.
- a nitrile compound As the solvent for the liquid electrolyte, a nitrile compound, an ether compound, an ester compound or the like is used, and a nitrile compound is preferable, and acetonitrile and methoxypropionitrile are particularly preferable.
- iodine and iodide iodide salt, ionic liquid is preferable, lithium iodide, tetrabutylammonium iodide, tetrapropylammonium iodide, methylpropylimidazolium iodide are preferable
- alkyl viologens for example, methyl viologen chloride, hexyl viologen bromide, benzyl viologen tetrafluoroborate
- polyhydroxybenzenes for example, hydroquinone, naphthohydroquinone, etc.
- divalent And trivalent iron complexes for example, red blood salt and yellow blood salt
- divalent and trivalent cobalt complexes and the like.
- the total concentration is preferably 0.01 mol / 1 or more, more preferably 0.1 mol / 1, particularly preferably 0.3 mol / 1 or more. It is.
- the upper limit in this case is not particularly limited, but is usually about 5 mol / 1.
- the cobalt complex is preferably a complex represented by the formula (CC).
- LL represents a bidentate or tridentate ligand.
- X represents a monodentate ligand.
- ma represents an integer of 0 to 3.
- mb represents an integer of 0-6.
- CI represents a counter ion when a counter ion is required to neutralize the charge.
- CI includes CI in the formula (I).
- LL is preferably a ligand represented by the following formula (LC).
- Z LC1 , Z LC2 and Z LC3 each independently represent an atomic group capable of forming a 5- or 6-membered ring.
- Z LC1 , Z LC2 and Z LC3 may have a substituent and may be closed with an adjacent ring via the substituent.
- q represents 0 or 1; Examples of the substituent include the substituent T described later.
- X is preferably a halogen ion.
- the ligand represented by the above formula (LC) is more preferably a ligand represented by the following formulas (LC-1) to (LC-3).
- R LC1 to R LC9 each represents a substituent.
- q1, q2, q6 and q7 each independently represents an integer of 0 to 4.
- q3 and q5 each independently represents an integer of 0 to 3.
- q4 represents an integer of 0-2.
- examples of the substituent for R LC1 to R LC9 include an aliphatic group, an aromatic group, and a heterocyclic group.
- Specific examples of the substituent include alkyl groups, alkoxy groups, alkylthio groups, aryl groups, aryloxy groups, arylthio groups, and heterocyclic rings.
- Preferred examples include alkyl groups (eg methyl, ethyl, n-butyl, n-hexyl, isobutyl, sec-butyl, t-butyl, n-dodecyl, cyclohexyl, benzyl etc.), aryl groups (eg phenyl, tolyl, naphthyl).
- alkyl groups eg methyl, ethyl, n-butyl, n-hexyl, isobutyl, sec-butyl, t-butyl, n-dodecyl, cyclohexyl, benzyl etc.
- aryl groups eg phenyl, tolyl, naphthyl
- alkoxy groups eg methoxy, ethoxy, isopropoxy, butoxy etc.
- alkylthio groups eg methylthio, n-butylthio, n-hexylthio, 2-ethylhexylthio etc.
- aryloxy groups eg phenoxy, naphthoxy etc.
- arylthio groups eg, phenylthio, naphthylthio, etc.
- heterocyclic groups eg, 2-thienyl, 2-furyl, etc.
- cobalt complex represented by the formula (LC) include the following complexes.
- iodine salt of a 5-membered or 6-membered nitrogen-containing aromatic cation.
- the ligand represented by the formula (A) is not an iodine salt, republished WO95 / 18456, JP-A-8-259543, Electrochemistry, Vol. 65, No. 11, page 923 (1997).
- iodine salts such as pyridinium salts, imidazolium salts, triazolium salts described in
- a solid charge transport system such as a p-type semiconductor or a hole transport material may be used.
- An organic hole transport material may be used as the solid charge transport layer.
- a coadsorbent In the photoelectric conversion element of this invention, it is preferable to use a coadsorbent with the metal complex dye of this invention or the pigment
- a co-adsorbent a co-adsorbent having at least one acidic group (preferably a carboxyl group or a salt group thereof) is preferable, and examples thereof include a compound having a fatty acid or a steroid skeleton.
- the fatty acid may be a saturated fatty acid or an unsaturated fatty acid, and examples thereof include butanoic acid, hexanoic acid, octanoic acid, decanoic acid, hexadecanoic acid, dodecanoic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid.
- Examples of the compound having a steroid skeleton include cholic acid, glycocholic acid, chenodeoxycholic acid, hyocholic acid, deoxycholic acid, lithocholic acid, ursodeoxycholic acid and the like. Preferred are cholic acid, deoxycholic acid and chenodeoxycholic acid, and more preferred are chenodeoxycholic acid.
- a preferred co-adsorbent is a compound represented by the following formula (CA).
- R A1 represents a substituent having an acidic group.
- R A2 represents a substituent.
- nA represents an integer of 0 or more.
- An acidic group is synonymous with what was shown previously.
- nA is preferably 2 to 4.
- These specific compounds include the compounds exemplified as the compounds having the steroid skeleton described above.
- the co-adsorbent of the present invention has an effect of suppressing inefficient association of dyes by adsorbing to semiconductor fine particles and an effect of preventing reverse electron transfer from the surface of the semiconductor fine particles to the redox system in the electrolyte.
- the amount of the coadsorbent used is not particularly limited, but is preferably 1 to 200 mol, more preferably 10 to 150 mol, and particularly preferably 20 to 50 mol, based on 1 mol of the total amount of the dye used including the metal complex dye. It is preferable from the viewpoint of effectively expressing the above action.
- ⁇ Substituent T> In this specification, about the display of a compound (a complex and a pigment
- a substituent that does not specify substitution / non-substitution means that the group may have an arbitrary substituent. This is also synonymous for compounds that do not specify substitution / non-substitution.
- Preferred substituents include the following substituent T. Further, in the present specification, when only described as a substituent, it refers to this substituent T, and each group, for example, an alkyl group, is only described. The preferred range and specific examples of the corresponding group of the substituent T are applied.
- substituent T examples include the following.
- An alkyl group preferably having 1 to 20 carbon atoms, such as methyl, ethyl, isopropyl, t-butyl, pentyl, heptyl, 1-ethylpentyl, benzyl, 2-ethoxyethyl, 1-carboxymethyl, trifluoromethyl, etc.
- Alkenyl groups preferably having 2 to 20 carbon atoms, such as vinyl, allyl, oleyl, etc.
- alkynyl groups preferably having 2 to 20 carbon atoms, such as ethynyl, butadiynyl, phenylethynyl, etc.
- cycloalkyl groups preferably Has 3 to 20 carbon atoms, for example, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, etc.
- cycloalkenyl group preferably having 5 to 20
- alkoxycarbonyl group preferably having 2 to 20 carbon atoms such as ethoxycarbonyl, 2-ethylhexyloxycarbonyl, etc.
- a cycloalkoxycarbonyl group preferably having 4 to 20 carbon atoms such as cyclopropyloxycarbonyl, cyclopentyloxycarbonyl, etc.
- Cyclohexyloxycarbonyl, etc. aryloxycarbonyl groups (preferably having 6 to 20 carbon atoms, such as phenyloxycarbonyl, naphthyloxycarbonyl, etc.)
- amino groups preferably having 0 to 20 carbon atoms, alkylamino groups, alkenyls
- An acyl group (preferably having 1 to 20 carbon atoms such as acetyl, cyclohexylcarbonyl, benzoyl, etc.), an acyloxy group (preferably having 1 to 20 carbon atoms such as acetyloxy, cyclohexylcarbonyl, etc.) Xy, benzoyloxy and the like), carbamoyl groups (preferably having 1 to 20 carbon atoms, alkyl, cycloalkyl or aryl carbamoyl groups are preferred, such as N, N-dimethylcarbamoyl, N-cyclohexylcarbamoyl, N-phenylcarbamoyl, etc. ),
- An acylamino group (preferably an acylamino group having 1 to 20 carbon atoms, such as acetylamino, cyclohexylcarbonylamino, benzoylamino, etc.), a sulfonamide group (preferably an alkyl, cycloalkyl or aryl sulfonamide having 0 to 20 carbon atoms) Groups such as methanesulfonamide, benzenesulfonamide, N-methylmethanesulfonamide, N-cyclohexylsulfonamide, N-ethylbenzenesulfonamide, etc., alkylthio groups (preferably having 1 to 20 carbon atoms, for example, Methylthio, ethylthio, isopropylthio, benzylthio, etc.), cycloalkylthio groups (preferably having 3 to 20 carbon atoms, such as cyclopropylthio, cyclopen
- a silyl group (preferably a silyl group having 1 to 20 carbon atoms and substituted by alkyl, aryl, alkoxy and aryloxy, such as triethylsilyl, triphenylsilyl, diethylbenzylsilyl, dimethylphenylsilyl, etc.), silyloxy group ( Preferably, it is a silyloxy group having 1 to 20 carbon atoms and substituted with alkyl, aryl, alkoxy and aryloxy, such as triethylsilyloxy, triphenylsilyloxy, diethylbenzylsilyloxy, dimethylphenylsilyloxy, etc.), hydroxyl group , Cyano group, nitro group, halogen atom (eg fluorine atom, chlorine atom, bromine atom, iodine atom), carboxyl group, sulfo group, phosphonyl group, phosphoryl group, boric acid group, more
- a compound or a substituent when a compound or a substituent includes an alkyl group, an alkenyl group, etc., these may be linear or branched, and may be substituted or unsubstituted. When an aryl group, a heterocyclic group, or the like is included, they may be monocyclic or condensed, and may be substituted or unsubstituted.
- Photoelectric conversion element and dye-sensitized solar cell >>
- the material used for the photoelectric conversion element and the dye-sensitized solar cell and the method for producing each member can be prepared by a conventional method performed in the photoelectric conversion element or the dye-sensitized solar cell.
- US Pat. No. 4,927,721, US Pat. No. 4,684,537, US Pat. No. 5,0843,65, US Pat. No. 5,350,644, US Pat. No. 463,057, US Pat. No. 5,525,440, JP-A-7-249790, JP-A-2004-220974, and JP-A-2008-135197 can be referred to.
- an outline of main materials or members will be described.
- the conductive support is preferably a support made of glass or plastic having a conductive film layer on the surface, such as a metal having a conductive property in itself.
- a support in addition to glass and plastic, ceramic (Japanese Patent Laid-Open No. 2005-135902) or conductive resin (Japanese Patent Laid-Open No. 2001-160425) may be used.
- the surface On the support, the surface may have a light management function. For example, an antireflection film in which high refractive films and low refractive index oxide films described in JP-A-2003-123859 are alternately laminated, A light guide function described in JP-A-2002-260746 can be mentioned.
- the thickness of the conductive film layer is preferably 0.01 to 30 ⁇ m, more preferably 0.03 to 25 ⁇ m, and particularly preferably 0.05 to 20 ⁇ m.
- the conductive support is substantially transparent.
- substantially transparent means that the light transmittance is 10% or more, preferably 50% or more, particularly preferably 80% or more.
- a glass or plastic coated with a conductive metal oxide is preferable. The coating amount of the conductive metal oxide at this time is preferably 0.1 to 100 g per 1 m 2 of the glass or plastic support. When a transparent conductive support is used, light is preferably incident from the support side.
- the semiconductor fine particles are preferably metal chalcogenide (for example, oxide, sulfide, selenide, etc.) or perovskite fine particles.
- metal chalcogenide for example, oxide, sulfide, selenide, etc.
- perovskite fine particles Preferred examples of the metal chalcogenide include titanium, tin, zinc, tungsten, zirconium, hafnium, strontium, indium, cerium, yttrium, lanthanum, vanadium, niobium, tantalum oxide, cadmium sulfide, cadmium selenide, and the like.
- Preferred perovskites include strontium titanate and calcium titanate. Of these, titanium oxide, zinc oxide, tin oxide, and tungsten oxide are particularly preferable.
- titania examples include anatase type, brookite type, and rutile type, and anatase type and brookite type are preferable. Titania nanotubes, nanowires, and nanorods may be mixed with titania fine particles or used as a semiconductor electrode.
- the particle size of the semiconductor fine particles is preferably 0.001 to 1 ⁇ m as the primary particle in terms of the average particle size when the projected area is converted into a circle, and the average particle size of the dispersion is 0.01 to 100 ⁇ m. It is preferable that As a method of coating the semiconductor fine particles on the conductive support, there are a dry method and other methods in addition to a wet method.
- a short-circuit prevention layer Is preferably formed.
- a spacer or a separator In order to prevent contact between the photoelectrode and the counter electrode, it is preferable to use a spacer or a separator.
- the semiconductor fine particles preferably have a large surface area so that many dyes can be adsorbed. For example, in a state where semiconductor fine particles are coated on a support, the surface area is preferably 10 times or more, more preferably 100 times or more the projected area. Although there is no restriction
- the preferred thickness of the photoreceptor layer containing semiconductor fine particles varies depending on the use of the device, but is typically 0.1 to 100 ⁇ m. When used as a dye-sensitized solar cell, the thickness is preferably 1 to 50 ⁇ m, more preferably 3 to 30 ⁇ m.
- the semiconductor fine particles may be fired at a temperature of 100 to 800 ° C. for 10 minutes to 10 hours in order to adhere the particles to each other after being applied to the support. When glass is used as the support, the film forming temperature is preferably 400 to 60 ° C.
- the coating amount of semiconductor fine particles per 1 m 2 of support is preferably 0.5 to 500 g, more preferably 5 to 100 g.
- the total amount of the dye used is preferably 0.01 to 100 mmol, more preferably 0.1 to 50 mmol, and particularly preferably 0.1 to 10 mmol per 1 m 2 of the support.
- the amount of the metal complex dye of the present invention is preferably 5 mol% or more.
- the adsorption amount of the dye to the semiconductor fine particles is preferably 0.001 to 1 mmol, more preferably 0.1 to 0.5 mmol, per 1 g of the semiconductor fine particles. By using such a dye amount, a sensitizing effect can be sufficiently obtained.
- the counter ion of the dye is not particularly limited, and examples thereof include alkali metal ions and quaternary ammonium ions.
- the surface of the semiconductor fine particles may be treated with amines.
- amines include pyridines (for example, 4-tert-butylpyridine, polyvinylpyridine) and the like. These may be used as they are in the case of a liquid, or may be used by dissolving in an organic solvent.
- the counter electrode is preferably one that functions as a positive electrode of a dye-sensitized solar cell (photoelectrochemical cell).
- the counter electrode is usually synonymous with the conductive support described above, but the support is not necessarily required in a configuration in which the strength is sufficiently maintained.
- As the structure of the counter electrode a structure having a high current collecting effect is preferable.
- at least one of the conductive support and the counter electrode must be substantially transparent.
- the conductive support is preferably transparent, and sunlight is preferably incident from the support side. In this case, it is more preferable that the counter electrode has a property of reflecting light.
- the counter electrode of the dye-sensitized solar cell glass or plastic on which metal or conductive oxide is vapor-deposited is preferable, and glass on which platinum is vapor-deposited is particularly preferable.
- the dye-sensitized solar cell it is preferable to seal the side surface of the battery with a polymer, an adhesive or the like in order to prevent the constituents from evaporating.
- the present invention is disclosed in Japanese Patent No. 4260494, Japanese Patent Application Laid-Open No. 2004-146425, Japanese Patent Application Laid-Open No. 2000-340269, Japanese Patent Application Laid-Open No. 2002-289274, Japanese Patent Application Laid-Open No. 2004-152613, and Japanese Patent Application Laid-Open No. 9-27352. It can apply to the described photoelectric conversion element and a dye-sensitized solar cell.
- dye adsorption electrode using the pigment
- the metal complex dye of the present invention is dissolved in a solvent and may contain a co-adsorbent and other components as necessary.
- a solvent include, but are not limited to, the solvents described in JP-A-2001-291534.
- an organic solvent is preferable, and alcohols, amides, nitriles, alcohols, hydrocarbons, and a mixed solvent of two or more of these are preferable.
- the mixed solvent is preferably a mixed solvent of alcohols and a solvent selected from amides, nitriles, alcohols or hydrocarbons. Further preferred are alcohols and amides, mixed solvents of alcohols and hydrocarbons, and particularly preferred are mixed solvents of alcohols and amides.
- the dye solution preferably contains a co-adsorbent.
- the co-adsorbent the above-mentioned co-adsorbent is preferable, and among them, the compound represented by the formula (CA) is preferable.
- the dye solution of the present invention is preferably one in which the concentration of the metal complex dye or coadsorbent is adjusted so that the solution can be used as it is when a photoelectric conversion element or a dye-sensitized solar cell is prepared.
- the metal complex dye of the present invention is preferably contained in an amount of 0.001 to 0.1% by mass.
- the water content of the dye solution is particularly preferably adjusted. Therefore, in the present invention, the content (content) of water is preferably adjusted to 0 to 0.1% by mass. Similarly, adjustment of the water content of the electrolytic solution in the photoelectric conversion element or the dye-sensitized solar cell is also preferable for effectively achieving the effects of the present invention. For this reason, the water content (content rate) of the electrolytic solution is preferable. Is preferably adjusted to 0 to 0.1% by mass.
- the electrolytic solution is particularly preferably adjusted with a dye solution. In the present invention, a semiconductor electrode for a dye-sensitized solar cell in which a metal complex dye is supported on the semiconductor surface of the semiconductor electrode using the dye solution is preferable. Moreover, it is preferable to manufacture a dye-sensitized solar cell by making a metal complex dye carry
- compounds represented by the formula (A-4 ′) or (A-5 ′) are useful.
- Ar 1 and Ar 2 in the formula (A-3) which is a ligand represent an aromatic group having an anion
- the anion has a proton as a counter cation.
- the substituent R preferably, when a compound useful for the ligand is coordinated to a metal, a connecting chain that connects the atom G1 and the atom present at the farthest position through the connection of the substituent R.
- the maximum number of connected chains N R out of the number of connected chains (number of bonds) is the minimum number of connected chains N M among the number of connected chains (number of bonds) connecting the metal atom M to the atom G1. -Greater than 1/2 times G1 , more preferably greater than 1 time.
- the compound represented by the formula (A-3) of the present invention can be used as a ligand of a metal complex dye other than the metal complex dye of the present invention, and can also be used as a ligand of a complex other than the metal complex dye. it can.
- Exemplified dye D-8 was prepared according to the method of the following scheme.
- the residue was purified by silica gel column chromatography, then added to a mixed solvent of 30 ml of acetone and 40 ml of 1N aqueous sodium hydroxide solution, and stirred at an external temperature of 40 ° C. for 4 hours. The temperature was returned to room temperature, the pH was adjusted to 3.5 with an aqueous trifluoromethanesulfonic acid solution, and the precipitate was filtered to obtain 3.0 g of a crude product. This was dissolved in a methanol solution together with TBAOH (tetrabutylammonium hydroxide) and purified with a Sephadex LH-20 column.
- TBAOH tetrabutylammonium hydroxide
- Example Dye D-8 was adjusted with a 340 ⁇ mol / L tetrabutylammonium hydroxide methanol solvent to a dye concentration of 17 ⁇ mol / L, and then measured with an ultraviolet-visible spectrophotometer (UV-2400-PC, Shimadzu Corporation). When the spectral absorption measurement was performed, the maximum absorption wavelength was 521 nm.
- Exemplified dye D-15 was prepared according to the method of the following scheme.
- Exemplified dye D-12 was prepared according to the method of the following scheme.
- Exemplified dye D-32 was prepared by changing C 6 H 13 Br to CH 3 I by the preparation method of Exemplified dye D-17.
- Compound d-26-3 was prepared according to the method of the following scheme, and Compound d-7-3 of Exemplified Dye D-15 was changed to Compound d-26-3, and the same procedure as Exemplified Dye D-15 was performed.
- Illustrative dye D-26 was prepared.
- Exemplified dye D-77 was prepared in the same manner as Exemplified dye D-33, except that Compound d-17-3 of Exemplified dye D-33 was changed to Compound d-77-3.
- Exemplified dye D-79 was prepared in the same manner as Exemplified dye D-7, except that Compound d-7-3 of Exemplified dye D-7 was changed to Compound d-77-3.
- the stannation reaction was applied to 5 g of 2-bromopyrimidine to obtain a stannate LA-4-3A.
- the above-mentioned Stille coupling was applied using 2 g of dimethyl 6-bromo-2,2′-bipyridine-4,4′-dicarboxylate and LA-4-3A as the stannation, and the ligand LA-4 Ligand LA-4-3Me which is a dimethyl ester of -3 was obtained.
- Exemplified dye D-91 was prepared in the same manner as Exemplified dye D-15, using Compound d-40-2 separately prepared.
- the maximum absorption wavelength ( ⁇ max) measured in the same manner as in the exemplary dye D-8 is shown in Table 1 below together with the measurement results of the mass spectrum (MS).
- the metal complex dyes of the present invention were all in the range of 500 to 750 nm, which was a preferable range for the photoelectric conversion element.
- NBu 4 is a tetrabutylammonium ion.
- Example 2 Various pastes for forming the semiconductor layer or light scattering layer of the semiconductor electrode constituting the photoelectrode were prepared, and dye-sensitized solar cells were prepared using this paste.
- a paste for forming a semiconductor layer or a light scattering layer of a semiconductor electrode constituting a photoelectrode was prepared with the composition shown in Table 3 below.
- a slurry was prepared by stirring put TiO 2 particles or mica particles in the medium, there cellulosic binder (title as Table 3 CB) was added as a thickening agent, kneaded A paste was obtained.
- the particles (TiO 2 particles and mica particles) in Table 3 below are as follows.
- TiO 2 particles- Particle 1 Anatase, average particle size; 25 nm TiO 2 particles 2: anatase, average particle size; 200 nm TiO 2 particles S1: (rod-shaped particles) anatase, diameter: 100 nm, aspect ratio: 5 TiO 2 particles S2: (rod-shaped particles) anatase, diameter; 30 nm, aspect ratio; 6.3 TiO 2 particles S3: (rod-shaped particles) anatase, diameter: 50 nm, aspect ratio: 6.1 TiO 2 particles S4: (rod-shaped particles) anatase, diameter: 75 nm, aspect ratio: 5.8 TiO 2 particles S5: (rod-shaped particles) anatase, diameter: 130 nm, aspect ratio: 5.2 TiO 2 particles S6: (rod-shaped particles) anatase, diameter: 180 nm, aspect ratio: 5 TiO 2 particles S7: (rod-shaped particles) anatase, diameter: 240 n
- a photoelectrode having the same configuration as the photoelectrode 12 shown in FIG. 5 described in JP-A-2002-289274 is prepared by the following procedure, and further described in the same publication using the photoelectrode.
- a specific configuration is shown in FIG. 2 attached to the present application. In FIG.
- 20 is a dye-sensitized solar cell
- 41 is a transparent electrode
- 42 is a semiconductor electrode
- 43 is a transparent conductive film
- 44 is a substrate
- 45 is a semiconductor layer
- 46 is a light scattering layer
- 40 is The photoelectrode
- CE is the counter electrode
- E is the electrolyte
- S is the spacer.
- a transparent electrode in which a fluorine-doped SnO 2 conductive film (film thickness: 500 nm) was formed on a glass substrate was prepared. Then, the SnO 2 conductive film, a paste 2 described above by screen printing and then dried. Then, it baked on the conditions of 450 degreeC in the air. Furthermore, by repeating this screen printing and baking using the paste 2, the semiconductor electrode A (the area of the light receiving surface; similar to the semiconductor electrode 42 shown in FIG. 2 attached to the present application) is formed on the SnO 2 conductive film.
- a photoelectrode A containing no dye containing the metal complex dye of the present invention was prepared.
- the metal complex dye was adsorbed on the semiconductor electrode A as follows. First, using anhydrous ethanol dehydrated with magnesium ethoxide as a solvent, the metal complex dyes listed in Table 4 below were dissolved to a concentration of 3 ⁇ 10 ⁇ 4 mol / L to prepare a dye solution. . Next, the semiconductor electrode was immersed in this solution, whereby the dye was adsorbed to the semiconductor electrode by about 1.5 ⁇ 10 ⁇ 7 mol / cm 2, and the photoelectrode 40 was completed.
- a platinum electrode (thickness of Pt thin film; 100 nm) having the same shape and size as the above-mentioned photoelectrode as a counter electrode, 0.05M iodine, 0.01M lithium iodide, 0.6M1-
- An iodine redox solution containing propyl-3-methylimidazolium iodide and 4-tert-butylpyridine was prepared.
- a DuPont spacer S (trade name: “Surlin”) having a shape corresponding to the size of the semiconductor electrode is prepared, as shown in FIG. 3 described in Japanese Patent Application Laid-Open No. 2002-289274.
- the dye-sensitized solar cell (cell A) using the photoelectrode A was completed by making the photoelectrode 40, the counter electrode CE, and the spacer S face each other and filling the above electrolyte therein.
- the performance of this solar cell was evaluated. The results are shown in Table 4 below.
- Evaluation series (1) Open circuit voltage Voc (mV)- The open-circuit voltage Voc (mV) obtained as described above was 560 mV or higher.
- the heat resistance of the dye-sensitized solar cell was evaluated based on the reduction rate of the open circuit voltage Voc (mV).
- the open-circuit voltage Voc (mV) of the dye-sensitized solar cell (cell A) produced as described above as the above the open-circuit voltage Voc (mV) after aging in a dark place at 80 ° C. for 300 hours as durability. ) was measured and the reduction rate (%) was determined. The rate of decrease (%) was determined by [(initial open circuit voltage ⁇ open circuit voltage after dark) / initial open circuit voltage] ⁇ 100. A reduction rate of 8.0% or less was accepted.
- Evaluation series (2) -Desorption speed- As an evaluation of the adsorption force of the metal complex dye on the titanium oxide surface, the desorption rate of the metal complex dye from the titanium oxide surface was used as an index.
- the desorption rate of the metal complex dye was calculated by a Quartz Crystal microbalance with Dissipation monitoring (QCM-D) intermolecular interaction measuring apparatus E1 (manufactured by Meiwa Forsys, Inc.).
- Paste 2 anatase, average particle size: 25 nm
- the dye adsorption amount was calculated by the following Sauerbrey equation from the resonance frequency shift ( ⁇ F) of the crystal resonator.
- ⁇ F ⁇ 2 ⁇ F 0 2 ⁇ ⁇ m / A ( ⁇ ⁇ P) 1/2
- F 0 is the single frequency of the crystal resonator
- ⁇ m is the mass change
- A is the piezoelectric active area of the Au electrode
- ⁇ and P are the density and rigidity of the crystal, respectively.
- the amount of the desorbed dye was measured by flowing it through the electrolyte E described above at 80 ° C. for 4 hours.
- the amount of desorbed dye was also calculated by the Sauerbrey equation. A desorption rate of 15 ⁇ g / cm 2 ⁇ hr or less was accepted.
- Evaluation series (3) - ⁇ max shift-
- the titanium oxide paste 2 printed on the FTO substrate as a semiconductor layer by screen printing with a film thickness of 5 ⁇ m is immersed in a 1.0 mM dye solution for 30 minutes to 12 hours to adsorb the dye. The amount was quantified. The amount of dye adsorbed was desorbed with a 1N tetrabutylammonium hydroxide methanol solution and quantified by high performance liquid chromatography. Under conditions made now to dye adsorption density of 70 [mu] g / cm 2 and 140 [mu] g / cm 2 in each dye, the transmission spectrum was measured separately fabricated cell was observed wavelength shift of spectral shape changes and .lambda.max. The measurement was performed using a spectrophotometer (U-4100, manufactured by Hitachi High-Tech).
- Short circuit current density Jsc (mA / cm 2 ) The short circuit current density Jsc (mA / cm 2 ) obtained by the battery characteristic test was evaluated according to the following criteria.
- the short-circuit current density Jsc (mA / cm 2 ) passed 18.0 mA / cm 2 or higher.
- the measurement was performed using a spectrophotometer (U-4100 (trade name), manufactured by Hitachi High-Tech). A dye residual ratio of 70% or more was regarded as acceptable.
- the metal complex dye of the present invention exhibits a high open circuit voltage Voc (mV), and the retention rate after the heat resistance test [the decrease rate of the open circuit voltage Voc (mV) after the heat resistance test (% )] Is also high. It can also be seen that the metal complex dye of the present invention has a small standard deviation of the open circuit voltage Voc (mV) and a small variation.
- the desorption rate of each of the metal complex dyes of the present invention is slower than that of the comparative metal complex dye, and in particular, D-15 to D-18, D-33, and D-82 are 0.5 ⁇ g / (cm 2 ⁇ hr) or less, most preferably D-7, D-8, D-12, D-13, D-23, D-26, D-30, D-77, D-79, D-84 is 1. It is in the range of 0.0 to 2.0 ⁇ g / (cm 2 ⁇ hr), and it is preferable next to the left.
- the adsorption rate of the metal complex dyes of the present invention is faster than the comparative metal complexes, and D-61, D-64, D-92 to D-99 show particularly good results. It was.
- the metal complex dye of the present invention is excellent in the adsorption power (adsorption rate) to the surface of the semiconductor fine particles and is difficult to desorb, this point seems to be related to the improvement in durability.
- the metal complex dye of the present invention has a dye structure on the semiconductor fine particles that has a small change in ⁇ max even when the amount of dye adsorbed is increased, and that hardly causes inefficient association.
- Example 3 A dye-sensitized solar cell having the same structure as that shown in FIG. 1 described in JP 2010-218770 A was produced by the following procedure. A specific configuration is shown in FIG. 3 attached to the drawings of the present application.
- 51 is a transparent substrate
- 52 is a transparent conductive film
- 53 is a barrier layer
- 54 is an n-type semiconductor electrode
- 55 is a p-type semiconductor layer
- 56 is a p-type semiconductor film
- 57 is a counter electrode (57a is a counter electrode) Projecting part).
- a transparent conductive oxide (TCO) glass substrate in which SnO 2 : F (fluorine-doped tin oxide) as a transparent conductive film 52 is formed on a transparent glass plate as a transparent substrate 51 of 20 mm ⁇ 20 mm ⁇ 1 mm by CVD is prepared. did. Next, 5 ml of a solution in which Ti [OCH (CH 3 ) 2 ] 4 and water are mixed at a volume ratio of 4: 1 is mixed with 40 ml of an ethyl alcohol solution adjusted to pH 1 with hydrochloride, and the TiO 2 precursor is mixed. A solution was prepared.
- this solution was spin-coated on a TCO glass substrate at 1000 rpm and sol-gel synthesis was performed, followed by heating at 78 ° C. for 45 minutes under vacuum, and annealing at 450 ° C. for 30 minutes to form a titanium oxide thin film A barrier layer 53 made of was formed.
- a slurry was prepared.
- the titanium oxide particles were uniformly dispersed using a homogenizer at a ratio of 10% by mass with respect to 100% by mass of the mixed solvent.
- a solution in which ethyl cellulose as a viscosity modifier is dissolved in ethanol so as to have a concentration of 10% by mass and an alcohol-based organic solvent (terpineol) are added to the titanium oxide slurry prepared above, and again And homogeneously dispersed with a homogenizer. Thereafter, alcohol other than terpineol was removed with an evaporator and mixed with a mixer to prepare a paste-like titanium oxide particle-containing composition.
- the composition of the prepared titanium oxide particle containing composition made the titanium oxide particle containing composition 100 mass%, the titanium oxide particle was 20 mass%, and the viscosity modifier was 5 mass%.
- the titanium oxide particle-containing composition thus prepared was applied on the barrier layer 53 formed above so as to form a predetermined pattern by screen printing, dried at 150 ° C., and then in an electric furnace. By heating to 450 ° C., a laminate in which the n-type semiconductor electrode 54 was laminated on the TCO glass substrate was obtained. Next, this laminate was immersed in a zinc nitrate (ZnNO 3 ) solution overnight, and then heated at 450 ° C. for 45 minutes for surface treatment. Thereafter, the surface-treated laminate was immersed in an ethanol solution (concentration of metal complex dye: 1 ⁇ 10 ⁇ 4 mol / L) using various metal complex dyes shown in Table 5 below. The metal complex dye was adsorbed inside the n-type semiconductor electrode 54 by being left for a period of time.
- ZnNO 3 zinc nitrate
- a copper plate having a thickness of 1 mm was washed with 1 M hydrochloric acid, and further washed with absolute ethanol, and then heated in the atmosphere at 500 ° C. for 4 hours to obtain a CuO nanowire having a maximum diameter of 100 nm and a height of 10 ⁇ m (protrusion 57a ) Was grown.
- This copper plate was sealed with iodine crystals in a sealed container and heated in a thermostatic bath at 60 ° C. for 1 hour to produce a counter electrode 57 having a thin CuI layer (p-type semiconductor film 56) coated on the surface. Then, the counter electrode 57 was pressed against the laminated body produced above from the p-type semiconductor layer 55 side and laminated.
- Example 4 The CdSe quantum dot process was performed on the photoelectrode by the following method, and the dye-sensitized solar cell shown in FIG. 4 was created using an electrolytic solution using a cobalt complex.
- FTO glass (1) manufactured by Nippon Sheet Glass Co., Ltd. Surface resistance: 8 ⁇ sq ⁇ 1
- the titanium (IV) bis (acetylacetonate) diisopropoxide ethanol solution was sprayed 16 times on the surface, and 450 ° C. for 30 minutes. It baked above.
- a transparent layer of about 2.1 ⁇ m with 20 nm-TiO 2 and a light scattering layer of about 6.2 ⁇ m with 60 nm-TiO 2 (manufactured by Showa Titanium Co., Ltd.) were laminated by screen printing, and later with a TiCl 4 aqueous solution. Processing was performed to prepare FTO / TiO 2 film 2.
- the FTO / TiO 2 film 2 was immersed in a 0.03M Cd (NO 3 ) 2 ethanol solution for 30 seconds in a glove bag under an inert gas atmosphere, and then continuously added to a 0.03M selenide ethanol solution. Soaked for 2 seconds. Then, it wash
- Selenide (Se 2 ⁇ ) was prepared in the system by adding 0.068 g of NaBH 4 (to a concentration of 0.060M) to a 0.030M SeO 2 ethanol solution in an Ar or N 2 atmosphere.
- this photoelectrode and counter electrode 4, hexachloroplatinic acid 2-propanol solution (0.05 M) on FTO glass 400
- the Pt was chemically precipitated at 20 ° C.
- Electrolyte using cobalt complex (0.75 M Co (o-phen) 3 2+ , 0.075 M Co (o-phen) 3 3+ , 0.20 M LiClO 4 acetonitrile / ethylene carbonate (4: 6 / v: v ) Solution) is injected into the gap 3 between the electrodes through a hole previously formed on the side of the counter electrode, and then the hole is closed by heat with a Binell (DuPont) sheet and a thin glass slide. A battery (cell A) was produced.
- a dye-sensitized solar cell (cell B) was produced using an iodine-based redox solution containing iodine and lithium iodide as in Example 1.
- the cobalt complex added to the electrolyte was prepared by the method described in Chemical Communications, 46, 8788-8790 (2010).
- Example 5 A photoelectric conversion element was prepared in the same manner as in Example 1 except that the co-adsorbents listed in Table 7 below were used as coexisting agents, and performance was evaluated in the same manner.
- the coadsorbent was added in an amount of 20 mol per 1 mol of the total amount of the metal complex dye. From the photoelectric conversion efficiency ( ⁇ ) when this coadsorbent coexists and the photoelectric conversion efficiency ( ⁇ ′) when this coadsorbent is not contained, the rate of increase in photoelectric conversion efficiency is expressed as [( ⁇ ′) / ⁇ ′] ⁇ 100.
- the improvement effect by the co-adsorbent was evaluated in the following rank.
- the photoelectric conversion element of the present invention has a significant increase in photoelectric conversion efficiency ⁇ (%) when a specific co-adsorbent coexists.
- Example 6 A solar battery using the cell shown in FIG. 2 of JP-A-2004-146425, a solar battery using the photoelectrode shown in FIG. 1 of JP-A-2004-152613, and JP-A-2000-90989 A solar cell using a tandem cell prepared in the same manner as in Example 1 described in Japanese Patent No. 1, and a dye-sensitized solar cell shown in FIG. Went. As a result, it was confirmed that any of the metal complex dyes of the present invention can provide good performance.
- Dye-sensitized solar cell 51 Transparent substrate 52 Transparent conductive film 53 Barrier layer 54 n-type semiconductor electrode 55 p-type semiconductor layer 56 p-type semiconductor film 57 Counter electrode 57a Protrusion
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Abstract
Description
(2)前記sp2炭素原子が、環を構成する炭素原子または芳香環と共役したエチレン構造における炭素原子である(1)に記載の光電変換素子。
(3)前記原子G1と、前記置換基Rの連結を通じて最も遠い位置に存在する原子を結ぶ連結鎖の連結鎖数(結合数)のうちの最大の連結鎖数NRが、前記金属原子Mから前記原子G1とを結ぶ連結鎖の連結鎖数(結合数)のうちの最小の連結鎖数NM-G1の1/2倍より多い(1)または(2)に記載の光電変換素子。
(4)前記最大の連結鎖数NRが、前記最小の連結鎖数NM-G1の1倍より多い(3)に記載の光電変換素子。
(5)前記角θが鋭角であり、かつ前記置換基Rが前記環状の基のα位に結合する(1)~(4)のいずれか1項に記載の光電変換素子。
(6)前記金属錯体色素が、下記式(I)で表される(1)~(5)のいずれか1項に記載の光電変換素子。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
n1は0~3の整数を表し、n2は0~4の整数を表し、n3は1または2を表し、r1は1~3の整数を表し、r2は0~2の整数を表し、l1は0または1を表す。)
Q1~Q3は各々独立に、孤立電子対を有する窒素原子、アニオンを有する窒素原子またはアニオンを有する炭素原子を表す。
D1~D4は各々独立に、炭素原子または窒素原子を表す。)
(7)前記式(A)において、前記Cyが下記式(A-1)または(A-2)で表される(6)に記載の光電変換素子。
(8)前記式(A)において、前記Cyが前記式(A-1)で表される(6)または(7)に記載の光電変換素子。
(9)前記式(I)において、前記LDが、下記式(A-3)で表される(6)~(8)のいずれか1項に記載の光電変換素子。
(10)前記式(B)が、下記式(B1)~(B8)のいずれかで表される(6)~(9)のいずれか1項に記載の光電変換素子。
Zdはベンゼン環、ナフタレン環、アントラセン環、フェナントレン環、ピレン環、ペリレン環、ピロール環、インドール環、イミダゾール環、ベンゾイミダゾール環、ピラゾール環、ピラジン環、ピリミジン環、ベンゾピリミジン環、ピリダジン環、ベンゾピリダジン環、トリアゾール環、ベンゾトリアゾール環、テトラゾール環、インダゾール環、トリアジン環、プリン環、キノリン環、イソキノリン環、キナゾリン環、チアゾール環、ベンゾチアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ベンゾオキサゾール環、フラン環、ベンゾ[b]フラン環、チオフェン環、ベンゾ[b]チオフェン環、ピロリジン環、ピペリジン環、モルホリン環、ピペラジン環、テトラヒドロフラン環、テトラヒドロピラン環、4H-ピラン環、1,4-ジヒドロピリジン環、テトラデヒドロモルホリン環またはテトラデヒドロチオモルホリン環を形成するのに必要な原子群を表す。
Ze~Zgは、ピリジン環以外の5もしくは6員環を形成するのに必要な原子群を表す。
Aは酸性基を表す。
Raはアリール基、ヘテロアリール基、アルキル基、シクロアルキル基、アルコキシ基またはシクロアルコキシ基を表す。ただし、該アルキル基は第3級もしくは第4級炭素原子を有し、該アルコキシ基が第3級もしくは第4級炭素原子を有するか、または該アルコキシ基の酸素原子に直接結合する炭素原子が第2級もしくは第3級炭素原子である。
REWGは電子吸引性基を表す。
RbおよびRcは置換基を表す。
a0は0~2の整数を表す。ただし式(B1)、式(B2)の各々において、a0の少なくとも1つは1または2である。
a1は1または2の整数を表す。
a2は1~4の整数を表し、a3は0~3の整数を表し、a4は0~4の整数を表す。ここで、a2とa3の和は1~4の整数である。
ただし、式(B5)~(B8)においては、少なくとも1つの酸性基を有する。)
(11)前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B1)である(10)に記載の光電変換素子。
(12)前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B2)である(10)に記載の光電変換素子。
(13)前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B3)または(B4)である(10)に記載の光電変換素子。
(14)前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B5)~(B8)のいずれかである(10)に記載の光電変換素子。
(15)前記LDが下記式(A-4)で表される配位子である(6)~(14)のいずれか1項に記載の光電変換素子。
Rdは、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アルキルチオ基、シクロアルキルチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、ハロゲン原子、シアノ基、アルコキシカルボニル基、シクロアルコキシカルボニル基または芳香族性基を表す。
b1は0~2の整数を表す。b1が2のとき、2個のRd同士が互いに結合して環を形成してもよい。)
(16)前記LDが下記式(A-5)で表される配位子である(6)~(14)のいずれか1項に記載の光電変換素子。
Rdは、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アルキルチオ基、シクロアルキルチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、ハロゲン原子、シアノ基、アルコキシカルボニル基、シクロアルコキシカルボニル基または芳香族性基を表す。
b1は0~2の整数を表す。b1が2のとき、2個のRd同士が互いに結合して環を形成してもよい。)
(17)前記環Aまたは環Bが、チオフェン環またはベンゼン環である(7)~(16)のいずれか1項に記載の光電変換素子。
(18)前記半導体微粒子に、さらに、酸性基を1つ以上有する共吸着剤が担持されている(1)~(17)のいずれか1項に記載の光電変換素子。
(19)前記共吸着剤が下記式(CA)で表される(18)に記載の光電変換素子。
(20)前記電解質中に含有するレドックス系化合物がコバルト錯体である(1)~(19)のいずれか1項に記載の光電変換素子。
(21)前記(1)~(20)のいずれか1項に記載の光電変換素子を含有する色素増感太陽電池。
(22)酸性基を少なくとも1つ有する3座の配位子を少なくとも1つ有し、金属原子Mに配位する配位子の少なくとも1つがsp2炭素原子を有し、該sp2炭素原子に、環状の基が結合しており、該sp2炭素原子と直結する該環状の基の原子から炭素原子でつながる環状の位置において、該sp2炭素原子と直結する該環状の基の原子に対してα位またはβ位の原子に、直鎖もしくは分岐のアルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリールオキシ基、アルキルチオ基、シクロアルキルチオ基、アリールチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、シリル基またはシリルオキシ基から選択される置換基Rが置換され、該置換基Rが結合したα位またはβ位の原子をG1とし、該原子G1に直接結合する上記置換基Rの原子をG2とした場合、上記原子G1を中心にした、上記金属原子M、上記原子G1および上記原子G2の成す角θ(∠MG1G2)が150°以下である金属錯体色素。
(23)下記式(I)で表される金属錯体色素。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
n1は0~3の整数を表し、n2は0~4の整数を表し、n3は1または2を表し、r1は1~3の整数を表し、r2は0~2の整数を表し、l1は0または1を表す。)
Q1~Q3は各々独立に、孤立電子対を有する窒素原子、アニオンを有する窒素原子またはアニオンを有する炭素原子を表す。
D1~D4は各々独立に、炭素原子または窒素原子を表す。)
(24)前記LDが下記式(A-3)であり、前記LAが下記式(B1)~(B8)のいずれかである(23)に記載の金属錯体色素。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
l1は0または1を表し、n1は0~3の整数を表し、n2は0~4の整数を表し、r2は0~2の整数を表す。R1が複数存在する場合は、互いに結合して縮環してもよい。
環Aは、5員環または6員環の環状の基を表す。ただし、RおよびR1が結合して環を形成することはない。ここで、上記基の結合手の原子からRが結合する位置の間に記載されている破線は、この部分が単結合であっても二重結合であってもよいことを意味する。)
Zdはベンゼン環、ナフタレン環、アントラセン環、フェナントレン環、ピレン環、ペリレン環、ピロール環、インドール環、イミダゾール環、ベンゾイミダゾール環、ピラゾール環、ピラジン環、ピリミジン環、ベンゾピリミジン環、ピリダジン環、ベンゾピリダジン環、トリアゾール環、ベンゾトリアゾール環、テトラゾール環、インダゾール環、トリアジン環、プリン環、キノリン環、イソキノリン環、キナゾリン環、チアゾール環、ベンゾチアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ベンゾオキサゾール環、フラン環、ベンゾ[b]フラン環、チオフェン環、ベンゾ[b]チオフェン環、ピロリジン環、ピペリジン環、モルホリン環、ピペラジン環、テトラヒドロフラン環、テトラヒドロピラン環、4H-ピラン環、1,4-ジヒドロピリジン環、テトラデヒドロモルホリン環またはテトラデヒドロチオモルホリン環を形成するのに必要な原子群を表す。
Ze~Zgは、ピリジン環以外の5もしくは6員環を形成するのに必要な原子群を表す。
Aは酸性基を表す。
Raはアリール基、ヘテロアリール基、アルキル基、シクロアルキル基、アルコキシ基またはシクロアルコキシ基を表す。ただし、該アルキル基は第3級もしくは第4級炭素原子を有し、該アルコキシ基が第3級もしくは第4級炭素原子を有するか、または該アルコキシ基の酸素原子に直接結合する炭素原子が第2級もしくは第3級炭素原子である。
REWGは電子吸引性基を表す。
RbおよびRcは置換基を表す。
a0は0~2の整数を表す。ただし式(B1)、式(B2)の各々において、a0の少なくとも1つは1または2である。
a1は1または2の整数を表す。
a2は1~4の整数を表し、a3は0~3の整数を表し、a4は0~4の整数を表す。ここで、a2とa3の和は1~4の整数である。
ただし、式(B5)~(B8)においては、少なくとも1つの酸性基を有する。)
(25)前記(22)~(24)のいずれか1項に記載の金属錯体色素を溶解してなる色素溶液。
(26)有機溶媒中に、前記金属錯体色素を0.001~0.1質量%含有させ、水を0.1質量%以下に抑えてなる請求項25に記載の色素溶液。
(27)前記色素溶液が、さらに共吸着剤を含有する(25)または(26)に記載の色素溶液。
(28)前記共吸着剤が、下記式(CA)で表される(27)に記載の色素溶液。
(29)下記式(A-3)で表される化合物。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
l1は0または1を表し、n1は0~3の整数を表し、n2は0~4の整数を表し、r2は0~2の整数を表す。
環Aは、5員環または6員環の環状の基を表す。ただし、RおよびR1が結合して環を形成することはない。ここで、上記基の結合手の原子からRが結合する位置の間に記載されている破線は、この部分が単結合であっても二重結合であってもよいことを意味する。)
(30)前記式(A-3)で表される化合物が、下記式(A-4’)で表される化合物である(29)に記載の化合物。
(31)前記式(A-3)で表される化合物が、下記式(A-5’)で表される化合物である(29)に記載の化合物。
本発明の上記及び他の特徴及び利点は、適宜添付の図面を参照して、下記の記載からより明らかになるであろう。
本発明の金属錯体色素は、酸性基を少なくとも1つ有する3座の配位子を少なくとも1つ有し、金属原子Mに配位する配位子の少なくとも1つがsp2炭素原子を有し、該sp2炭素原子に、環状の基が結合しており、該sp2炭素原子と直結する該環状の基の原子から炭素原子でつながる環状の位置において、該sp2炭素原子と直結する該環状の基の原子に対してα位またはβ位の原子に、直鎖もしくは分岐のアルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリールオキシ基、アルキルチオ基、シクロアルキルチオ基、アリールチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、シリル基またはシリルオキシ基から選択される置換基Rが置換され、該置換基Rが結合したα位またはβ位の原子をG1とし、該原子G1に直接結合する上記置換基Rの原子をG2とした場合、上記原子G1を中心にした、上記金属原子M、上記原子G1および上記原子G2の成す角θ(∠MG1G2)が150°以下である金属錯体色素である。ただし、∠MG1G2の値は180°以下の方の角度を採用する。
ここで、5-(2-ピリジル)ピラゾール骨格の配位子は、置換基Rを有する環状の基(61a)を有している。
金属原子M、上記原子G1および上記原子G2の成す角θ(∠MG1G2)は、具体的には図7に示す通りである。上記原子G2が、環状の基のα位に結合したものが図7の左側で、β位に結合したものが右側である。図7ではsp2炭素原子をCsp2として示した。
本発明において、さらに好ましい分子構造は、本発明における置換基Rの長さが、金属原子Mから置換基Rが置換する環状の基の原子(G1)までの長さの1/2倍より長い場合が好ましく、さらに好ましくは1倍より長い場合である。置換基Rの長さがこのように長いことで、半導体微粒子へのレドックス系(例えばI3 -)の接近抑制がより効率的になる。
本発明は環状の基に特定の置換基Rを有する。
本発明において、置換基Rはsp2炭素原子に結合する環状の基のα位もしくはβ位に有する。
本発明においては、配位子の基本骨格に少なくとも1つのsp2炭素原子を有するものであるが、該sp2炭素原子が、環を形成する原子、もしくは芳香環と環状の基を連結する、共役連結基(例えば、エテニレン基、エチニレン基、アリーレン基、ヘテロアリーレン基もしくはこれらが繰り返した連結基)の炭素原子であることが好ましく、求核種による耐久性の観点からさらに好ましくは環を形成する原子である。ここで、共役連結基は、エテニレン基が好ましく、さらに好ましくは芳香環と直接結合したエチレンの末端の炭素原子(芳香環-C1=C2のC2)である。
ここで、酸性基とは、解離性のプロトンを有する置換基であり、pKaが11以下である。例えば、カルボキシ基、ホスホニル基、ホスホリル基、スルホ基、ホウ酸基等の酸性を示す基である酸基、あるいはこれらのいずれかを有する基が挙げられ、好ましくは電子注入の観点からカルボキシ基あるいはこれを有する基である。また酸性基はプロトンを放出して解離した形を採っていてもよく、塩であってもよい。
本発明の金属錯体色素のうち、好ましい金属錯体色素は、下記式(I)で表すことができる。
本発明において、配位子LDは、ドナー配位子に分類されるものであり、前記式(A)で表される。
本発明において、配位子LAはアクセプター配位子に分類されるものであり、下記式(B)で表される。
(-I効果)
・-O+(Rα)2 > -N+(Rα)3
・-N+(Rα)3 > -P+(Rα)3 > …
・-O+(Rα)2 > -S+(Rα)2 > …
・-N+(Rα)3 > -NO2 > -SO2Rα > -SORα
・-SO2Rα > -SO3Rα
・-N+(Rα)3 > -N(Rα)2
・-O+(Rα)2 > -ORα
・-S+(Rα)2 > -SRα
・-F > -Cl > -Br > -I
・=O > =NR > =C(Rα)2
・=O > -ORα
・≡N > ≡CRα
・≡N > =NRα > -N(Rα)2
・-C≡CRβ > -CRβ=C(Rβ)2 > -C(Rβ)2C(Rβ)3
(-M効果)
・=N+(Rα)3 > =NRα
・=O > =NRα > =C(Rβ)2
・=S > =O > ≡N
Xは、単座配位子を表し、アシルオキシアニオン、アシルチオアニオン、チオアシルオキシアニオン、チオアシルチオアニオン、アシルアミノオキシアニオン、チオカルバメートアニオン、ジチオカルバメートアニオン、チオカルボネートアニオン、ジチオカルボネートアニオン、トリチオカルボネートアニオン、アシルアニオン、チオシアネートアニオン、イソチオシアネートアニオン、シアネートアニオン、イソシアネートアニオン、シアノアニオン、アルキルチオアニオン、アリールチオアニオン、アルコキシアニオンおよびアリールオキシアニオンからなる群から選択されるアニオンもしくはこれらの基で配位する単座配位子、またはハロゲン原子、シアノ、カルボニル、ジアルキルケトン、カルボンアミド、チオカルボンアミド及びチオ尿素からなるアニオン、原子もしくは化合物(アニオンに水素原子が置換された化合物を含む)の群より選ばれる単座配位子が挙げられる。なお、配位子Xがアルキル基、アルケニル基、アルキニル基、アルキレン基等を含む場合、それらは直鎖状でも分岐状でもよく、置換されていても無置換でもよい。またアリール基、ヘテロ環基、シクロアルキル基等を含む場合、それらは置換されていても無置換でもよく、単環でも縮環していてもよい。
Mは金属錯体色素の中心金属であり、式(I)においては、RuまたはOsを表すが、本発明においてはRuが好ましい。
式(I)中のCIは電荷を中和させるのに対イオンが必要な場合の対イオンを表す。一般に、色素が陽イオン又は陰イオンであるか、あるいは正味のイオン電荷を有するかどうかは、金属錯体色素中の金属、配位子および置換基に依存する。
置換基が解離性基を有することなどにより、式(I)で表される金属錯体色素は解離して負電荷を持ってもよい。この場合、式(I)で表される金属錯体色素全体の電荷はCIにより電気的に中性とされる。
本発明において、CIは無機又は有機のアンモニウムイオン、特にテトラブチルアンモニウムイオン、ナトリウムイオン、プロトンが好ましい。
式(I)中のm1は1または2を表し、1が好ましい。
式(I)中のm2は1を表す。
式(I)中のm3は0または1を表し、0が好ましい。
本発明の金属錯体色素は、特開2001-291534号公報や当該公報に引用された方法に準じた方法、非特許文献1のChem.Commun.,2009,5844-5846に記載の方法に準じた方法で容易に合成することができる。
併用する色素としては、特許第3731752号、特公表2002-512729号、特開2001-59062号、特開2001-6760号、特許第3430254号、特開2003-212851号、国際公開第2007/91525号パンフレット、特開2001-291534号、特願2010-127308号の各公報もしくは明細書などに開示のRu錯体色素、特開平11-214730号、特開2012-144688号、特開2012-84503号等の各公報に記載のスクアリリウムシアニン色素、特開2004-063274号、特開2005-123033号、特開2007-287694号、特開2008-71648号、特開2007-287694号、国際公開第2007/119525号パンフレットの各公報もしくは明細書に記載の有機色素、Angew.Chem.Int.Ed.,49,1~5(2010)などに記載のポルフィリン色素、Angew.Chem.Int.Ed.,46,8358(2007)などに記載のフタロシアニン色素が挙げられる。併用する色素として好ましくは、Ru錯体色素、スクアリリウムシアニン色素、または有機色素が挙げられる。
本発明の光電変換素子(例えば光電変換素子10)および色素増感太陽電池(例えば光電気化学電池20、50)においては、少なくとも上記の本発明の金属錯体色素を使用する。
本発明の光電変換素子は、例えば、図1に示すように、光電変換素子10は、導電性支持体1、色素(金属錯体色素)21により増感した半導体微粒子を含む感光体層2、正孔輸送層である電荷移動体層3および対極4からなる。ここで本発明においては、半導体微粒子22に、色素(金属錯体色素)21とともに、共吸着剤が吸着されていることが好ましい。感光体層2を設置した導電性支持体1は光電変換素子10において作用電極として機能する。本実施形態においては、この光電変換素子10を外部回路6で動作手段Mに仕事をさせる電池用途に使用できるようにした色素増感太陽電池を利用したシステム100として示している。
本発明の光電変換素子に用いられる電荷移動体層は、色素の酸化体に電子を補充する機能を有する層であり、受光電極と対極(対向電極)との間に設けられる。代表的な例としては、酸化還元対を有機溶媒に溶解した液体電解質、酸化還元対を有機溶媒に溶解した液体をポリマーマトリクスに含浸したいわゆるゲル電解質、酸化還元対を含有する溶融塩などが挙げられる。電荷移動の効率を高めるためには液体電解質が好ましい。液体電解質の溶媒はニトリル化合物、エーテル化合物、エステル化合物等が用いられるが、ニトリル化合物が好ましく、アセトニトリル、メトキシプロピオニトリルが特に好ましい。
LLは下記式(LC)で表される配位子が好ましい。
本発明の光電変換素子においては、本発明の金属錯体色素または必要により併用する色素とともに共吸着剤を使用することが好ましい。このような共吸着剤としては酸性基(好ましくは、カルボキシル基もしくはその塩の基)を1つ以上有する共吸着剤が好ましく、脂肪酸やステロイド骨格を有する化合物が挙げられる。脂肪酸は、飽和脂肪酸でも不飽和脂肪酸でもよく、例えばブタン酸、ヘキサン酸、オクタン酸、デカン酸、ヘキサデカン酸、ドデカン酸、パルミチン酸、ステアリン酸、オレイン酸、リノール酸、リノレン酸等が挙げられる。
ステロイド骨格を有する化合物として、コール酸、グリココール酸、ケノデオキシコール酸、ヒオコール酸、デオキシコール酸、リトコール酸、ウルソデオキシコール酸等が挙げられる。好ましくはコール酸、デオキシコール酸、ケノデオキシコール酸であり、さらに好ましくはケノデオキシコール酸である。
酸性基は、先に示したものと同義である。
nAは2~4であることが好ましい。
本明細書において化合物(錯体、色素を含む)の表示については、当該化合物そのもののほか、その塩、そのイオンを含む意味に用いる。また、本明細書において置換・無置換を明記していない置換基(連結基および配位子についても同様)については、その基に任意の置換基を有していてもよい意味である。これは置換・無置換を明記していない化合物についても同義である。好ましい置換基としては、下記置換基Tが挙げられる。
また、本明細書において、単に置換基としてしか記載されていない場合は、この置換基Tを参照するものであり、また、各々の基、例えば、アルキル基、が記載されているのみの時は、この置換基Tの対応する基における好ましい範囲、具体例が適用される。
アルキル基(好ましくは炭素数1~20で、例えばメチル、エチル、イソプロピル、t-ブチル、ペンチル、ヘプチル、1-エチルペンチル、ベンジル、2-エトキシエチル、1-カルボキシメチル、トリフルオロメチル等)、アルケニル基(好ましくは炭素数2~20で、例えば、ビニル、アリル、オレイル等)、アルキニル基(好ましくは炭素数2~20で、例えば、エチニル、ブタジイニル、フェニルエチニル等)、シクロアルキル基(好ましくは炭素数3~20で、例えば、シクロプロピル、シクロペンチル、シクロヘキシル、4-メチルシクロヘキシル等)、シクロアルケニル基(好ましくは炭素数5~20での、例えばシクロペンテニル、シクロヘキセニル等)、アリール基(好ましくは炭素数6~26で、例えば、フェニル、1-ナフチル、4-メトキシフェニル、2-クロロフェニル、3-メチルフェニル等)、ヘテロ環基(好ましくは炭素数2~20で、少なくとも1つの酸素原子、硫黄原子、窒素原子を有する5または6員環のヘテロ環基が好ましく、例えば、2-ピリジル、4-ピリジル、2-イミダゾリル、2-ベンゾイミダゾリル、2-チアゾリル、2-オキサゾリル等)、アルコキシ基(好ましくは炭素数1~20で、例えば、メトキシ、エトキシ、イソプロピルオキシ、ベンジルオキシ等)、アルケニルオキシ基(好ましくは炭素数2~20で、例えば、ビニルオキシ、アリルオキシ等)、アルキニルオキシ基(好ましくは炭素数2~20で、例えば、2-プロペニルオキシ、4-ブチニルオキシ等)、シクロアルキルオキシ基(好ましくは炭素数3~20で、例えば、シクロプロピルオキシ、シクロペンチルオキシ、シクロヘキシルオキシ、4-メチルシクロヘキシルオキシ等)、アリールオキシ基(好ましくは炭素数6~26で、例えば、フェノキシ、1-ナフチルオキシ、3-メチルフェノキシ、4-メトキシフェノキシ等)、ヘテロ環オキシ基(例えば、イミダゾリルオキシ、ベンゾイミダゾリルオキシ、チアゾリルオキシ、ベンゾチアゾリルオキシ、トリアジニルオキシ、プリニルオキシ)、
本発明において光電変換素子および色素増感太陽電池に用いられる材料および各部材の作成方法については、光電変換素子や色素増感太陽電池で行われている通常の方法で作成でき、例えば米国特許第4,927,721号明細書、米国特許第4,684,537号明細書、米国特許第5,0843,65号明細書、米国特許第5,350,644号明細書、米国特許第5,463,057号明細書、米国特許第5,525,440号明細書、特開平7-249790号公報、特開2004-220974号公報、特開2008-135197号公報を参照することができる。
以下、主たる材料または部材について概略を説明する。
色素が塩である場合、この色素の対イオンは特に限定されず、例えばアルカリ金属イオンまたは4級アンモニウムイオン等が挙げられる。
本発明においては、本発明の金属錯体色素を含有する色素溶液を使用して色素吸着電極を製造することが好ましい。
このような色素溶液には、本発明の金属錯体色素が溶媒に溶解されてなり、必要により共吸着剤や他の成分を含んでもよい。
このような溶媒としては、特開2001-291534号公報に記載の溶媒が挙げられるが特に限定されない。本発明においては有機溶媒が好ましく、さらにアルコール類、アミド類、ニトリル類、アルコール類、炭化水素類、および、これらの2種以上の混合溶媒が好ましい。混用溶媒としては、アルコール類と、アミド類、ニトリル類、アルコール類または炭化水素類から選択される溶媒との混合溶媒が好ましい。さらに好ましくはアルコール類とアミド類、アルコール類と炭化水素類の混合溶媒、特に好ましくはアルコール類とアミド類の混合溶媒である。
ここで、本発明の色素溶液は、光電変換素子や色素増感太陽電池を作成する際に、この溶液をこのまま使用できるように、金属錯体色素や共吸着剤が濃度調整されているものが好ましい。本発明においては、本発明の金属錯体色素を0.001~0.1質量%含有することが好ましい。
同様に、光電変換素子や色素増感太陽電池における電解液の水分含有量の調整も、本発明の効果を効果的に奏するために好ましく、このため、この電解液の水分含有量(含有率)を0~0.1質量%に調整することが好ましい。この電解液の調整は、色素溶液で行なうのが特に好ましい。
本発明においては、上記色素溶液を用いて、半導体電極が備える半導体表面に金属錯体色素を担持させてなる色素増感太陽電池用半導体電極が好ましい。
また、上記色素溶液を用いて、半導体電極が備える半導体微粒子表面に金属錯体色素を担持させることにより色素増感太陽電池を製造することが好ましい。
前述の式(I)で表される金属錯体色素において組み込まれる化合物である前記式(A-3)で表される化合物は、配位子として有用である。なかでも前記式(A-4’)または(A-5’)で表される化合物が有用である。
ここで、上記化合物では、配位子である式(A-3)においてAr1、Ar2がアニオンを有する芳香族基を表す場合、アニオンはカウンターカチオンとしてプロトンを有する。
また、置換基Rとして好ましくは、該配位子に有用な化合物が金属に配位した際に、前記原子G1と、前記置換基Rの連結を通じて最も遠い位置に存在する原子を結ぶ連結鎖の連結鎖数(結合数)のうちの最大の連結鎖数NRが、前記金属原子Mから前記原子G1とを結ぶ連結鎖の連結鎖数(結合数)のうちの最小の連結鎖数NM-G1の1/2倍より大きく、さらに好ましくは1倍より大きい。
本発明の式(A-3)で表される化合物は、本発明の金属錯体色素以外の金属錯体色素の配位子としても使用でき、また金属錯体色素以外の錯体の配位子としても使用できる。
以下に、本発明の金属錯体色素の合成方法(調製方法)を詳しく説明するが、出発物質、色素中間体および合成(調製)ルートについてはこれにより限定されるものではない。
下記のスキームの方法に従って例示色素D-8を調製した。
化合物d-8-8 25gをTHF(テトラヒドロフラン)200mlに溶解し、窒素雰囲気下、-78℃で攪拌しながら、1.6Mブチルリチウムのヘキサン溶液を1.05当量添加し15分攪拌した。その後n-ヘキシルブロミド1.5当量をTHF50mlに溶解した溶液を滴下した。0℃に戻した後、塩化アンモニウム水溶液を滴下、分液し、有機層を濃縮し、得られた粗精製物をシリカゲルカラムクロマトグラフィーで精製後、化合物d-8-9 25.7gを得た。
化合物d-8-9 25gをTHF(テトラヒドロフラン)200mlに溶解し、窒素雰囲気下、-15℃で攪拌しながら、1.6Mブチルリチウムのヘキサン溶液を1.05当量添加し15分攪拌した。その後DMF(N,N-ジメチルホルムアミド)1.2当量を滴下した。0℃に戻した後、塩化アンモニウム水溶液を滴下、分液し、有機層を濃縮し、得られた粗精製物をシリカゲルカラムクロマトグラフィーで精製後、化合物d-8-5 24.3gを得た。
化合物d-8-1(2-アセチル-4-メチルピリジン)25gをTHF(テトラヒドロフラン)200mlに溶解し、窒素雰囲気下、0℃で攪拌しながら、ナトリウムエトキシド18.9gを添加し15分攪拌した。その後、化合物d-8-2(トリフルオロ酢酸エチル)28.9gを滴下し、外設70℃で20時間攪拌した。室温に戻した後、塩化アンモニウム水溶液を滴下、分液し、有機層を濃縮し、粗精製物d-8-3 54.2gを得た。
化合物d-8-3 54.2gをエタノール220mlに溶解し窒素雰囲気下、室温で攪拌しながら、ヒドラジン1水和物5.6mlを添加し、外設90℃で1時間加熱した。その後、濃塩酸5mlを添加し、1時間攪拌した。濃縮後、重曹水150mlと酢酸エチル150mlで抽出・分液後、有機層を濃縮した。アセトニトリルで再結晶後、化合物d-8-4 23.2gを得た。
ジイソプロピルアミン 4.1gとテトラヒドロフラン30mlを窒素雰囲気下、-40℃で攪拌しながら、1.6M n-ブチルリチウムのヘキサン溶液を23.1ml滴下した後、2時間攪拌した。その後、化合物d-8-4 4.0gを添加し0℃で80分攪拌した後、化合物d-8-5 3.73gをテトラヒドロフラン15mlに溶解した溶液を滴下した。その後、0℃で80分攪拌し、室温で5時間攪拌した。その後塩化アンモニウム溶液を添加し、酢酸エチルで抽出分液した。有機層を濃縮し、シリカゲルカラムクロマトグラフィーで精製後、化合物d-8-6 5.8gを得た。
化合物d-8-6 5.0gとPPTS(ピリジニウムパラトルエンスルホン酸)5.9gを、トルエン50mlに加え、窒素雰囲気下で5時間加熱還流を行った。濃縮後、飽和重曹水及び塩化メチレンで分液を行い、有機層を濃縮した。得られた結晶はメタノール及び塩化メチレンで再結晶後、化合物d-8-7 3.9gを得た。
得られた化合物d-8-7の構造はMS(マススペクトル)測定により確認した。
MS-ESI m/z=488.2(M-H)+
化合物d-8-10 1.20g、化合物d-8-7 1.62g、をジエチレングリコールモノエチルエーテル150mlに加え窒素雰囲気下、70℃で3時間攪拌した後、化合物d-8-11 1.63gを加え120℃で8時間加熱攪拌した。その後チオシアン酸カリウム 10.7gを加え160℃で8時間攪拌した。濃縮後、水を加えろ過した。ろ物をシリカゲルカラムクロマトグラフィーで精製した後、アセトン30mlと1N水酸化ナトリウム水溶液40mlの混合溶媒に加え、外設40℃で4時間攪拌した。室温に戻し、トリフルオロメタンスルホン酸水溶液でpHを3.5に調整し、析出物をろ過し、粗精製物 3.0gを得た。
これをTBAOH(水酸化テトラブチルアンモニウム)と共にメタノール溶液に溶解し、SephadexLH-20カラムで精製した。主層の分画を回収し濃縮後トリフルオロメタンスルホン酸溶液を加え、pH3に調整し、析出物をろ過し、例示色素D-8 2.4gを得た。
得られた例示色素D-8の構造はMS(マススペクトル)測定により確認した。
MS-ESI m/z=1012.2(M-H)+
下記のスキームの方法に従って化合物d-7-7を調製し、以下例示色素D-8の化合物d-8-7を化合物d-7-7に変更して、例示色素D-8と同様にして例示色素D-7を調製した。
下記のスキームの方法に従って化合物d-1-3を調製し、以下例示色素D-7の化合物d-7-3を化合物d-1-3に変更し、さらにチオシアン酸カリウムをセレノシアン酸カリウムに変更し、例示色素D-7と同様にして例示色素D-1を調製した。
下記のスキームの方法に従って化合物d-2-3を調製し、以下例示色素D-7の化合物d-7-3を化合物d-2-3に変更し、さらにチオシアン酸カリウムをシアン酸カリウムに変更し、例示色素D-7と同様にして例示色素D-2を調製した。
例示色素D-7のときと同様に、化合物d-7-7を調製し、以下例示色素D-8の化合物d-8-7を化合物d-7-7に変更し、化合物d-8-11を化合物d-9-1に変更し、例示色素D-8と同様にして例示色素D-9を調製した。
下記のスキームの方法に従って例示色素D-15を調製した。
得られた化合物d-15-5の構造はMS(マススペクトル)測定により確認した。
MS-ESI m/z=596.2(M-H)+
下記のスキームの方法に従って例示色素D-12を調製した。
MS-ESI m/z=409.3(M-H)+
下記のスキームの方法に従って化合物d-13-2を調製し、以下例示色素D-12の化合物d-12-3を化合物d-13-2に変更し、例示色素D-12と同様にして例示色素D-13を調製した。
下記のスキームの方法に従って化合物d-16-2を調製し、以下例示色素D-15の化合物d-7-3を化合物d-16-2に変更し、例示色素D-15と同様にして例示色素D-16を調製した。
下記のスキームの方法に従って化合物d-17-3を調製し、以下例示色素D-15の化合物d-7-3を化合物d-17-3に変更し、例示色素D-15と同様にして例示色素D-17を調製した。
下記のスキームの方法に従って化合物d-18-2を調製し、以下例示色素D-15の化合物d-7-3を化合物d-18-2に変更し、例示色素D-15と同様にして例示色素D-18を調製した。
化合物d-17-3を用いて化合物d-40-2を調製し、また化合物d-9-1と同様にして化合物d-17-3を用いて化合物d-40-3を調製した。これらを用いて例示色素D-40を調製した。
1H-NMR(CDCl3、400MHz):δ(ppm):12.3(2H,br),7.61(2H,d),7.27(1H,t)、6.82(2H,s)、6.57(2H,d)、3.91(4H,t)、1.65(4H,dt),1.30-1.15(12H,m),0.81(3H,t)
MS-ESI m/z=622.3(M-H)-
下記のスキームの方法に従って化合物d-47-4を調製し、別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-47を調製した。
下記のスキームの方法に従って化合物d-60-1を調製し、別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-60を調製した。
下記のスキームの方法に従って化合物d-61-2を調製し、別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-61を調製した。
下記のスキームの方法に従って化合物d-64-4を調製し、別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-64を調製した。
下記のスキームの方法に従って化合物d-69-4を調製し、別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-69を調製した。
例示色素D-17の調製方法で、C6H13BrをCH3Iに変更することで、例示色素D-32を調製した。
下記のスキームの方法に従って化合物d-23-6を調製し、以下例示色素D-7の化合物d-7-3を化合物d-23-6に変更して、例示色素D-7と同様にして例示色素D-23を調製した。
下記のスキームの方法に従って化合物d-26-3を調製し、以下例示色素D-15の化合物d-7-3を化合物d-26-3に変更して、例示色素D-15と同様にして例示色素D-26を調製した。
下記のスキームの方法に従って化合物d-30-3を調製し、以下例示色素D-15の化合物d-7-3を化合物d-30-3に変更して、例示色素D-15と同様にして例示色素D-30を調製した。
下記のスキームの方法に従って化合物d-33-4を調製し、以下例示色素D-7の化合物d-17-3を化合物d-33-4に変更して、例示色素D-7同様にして例示色素D-33を調製した。
1H-NMR(CDCl3、400MHz):δ(ppm):11.5(1H,br),8.61(1H,d),7.83(1H,dd)、7.61(1H,d)、7.27(1H,t)、6.94(1H,s)、6.64(1H,d)、3.92(4H,t)、1.64(4H,dt),1.30-1.15(12H,m),0.81(3H,t)
MS-ESI m/z=488.3(M-H)-
例示色素D-33の化合物d-17-3を化合物d-77-3に変更して、例示色素D-33と同様にして例示色素D-77を調製した。
例示色素D-7の化合物d-7-3を化合物d-77-3に変更して、例示色素D-7と同様にして例示色素D-79を調製した。
下記のスキームの方法に従って化合物d-82-3を調製し、以下例示色素D-15の化合物d-7-3を化合物d-82-3に変更して、例示色素D-15と同様にして例示色素D-82を調製した。
下記のスキームの方法に従って化合物d-84-2を調製し、以下例示色素D-7の化合物d-7-3を化合物d-84-2に変更して、例示色素D-7と同様にして例示色素D-84を調製した。
ハロゲンが置換した基質約5gに対し、1.2倍モルのビストリブチルスズ、0.05倍モルのテトラキストリフェニルフォスフィンパラジウムをトルエン100ml中で窒素雰囲気下、還流した。薄層クロマトグラフィーで反応終了を確認し、室温冷却後、反応液を濾過、濃縮し、分取カラムクロマトグラフィー装置〔山善(株)社製AI-580〕および溶離液としてn-へキサン、酢酸エチル、メタノールの混合溶媒を用いて濃度勾配を制御しながら流すことで分離精製を行った。目的のフラクションを濃縮することでスズ化体が得られる。
ハロゲンが置換した基質約2gとスズ化体1.3倍モル、0.05倍モルの塩化パラジウム(II)、0.1倍モルのヨウ化銅(I)、2倍モルのフッ化セシウム、0.1倍モルのトリ-t-ブチルホスフィンをN,N-ジメチルアセトアミド100ml中で窒素雰囲気下、80℃で加熱した。薄層クロマトグラフィーで反応の終了を確認した後、反応液を濾過し、室温まで冷却後、濃縮し、上記分取カラムクロマトグラフィー装置および同様の溶離液を用いて分離精製を行った。目的のフラクションを濃縮することで目的物が得られる。
配位子LA-3-11のジメチルエステル(LA-3-11Me)の合成
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-86を調製した。
配位子LA-3-4のジメチルエステル(LA-3-4Me)の合成
配位子LA-3-11Meの合成において原料である2-ブロモ-6-シアノピリジン5gを等モルの2-ブロモ-5-トリフルオロメチルピリジンに置き換え、その他は同様にして配位子LA-3-4のジメチルエステル体である配位子LA-3-4Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-88を調製した。
配位子LA-3-19のジメチルエステル(LA-3-19Me)の合成
配位子LA-3-11Meの合成において2-ブロモ-6-シアノピリジン5gを等モルの2-ブロモ-5-メチルスルホニルピリジンに置き換え、その他は同様にして配位子LA-3-19のジメチルエステル体である配位子LA-3-19Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-89を調製した。
配位子LA-3-12のジメチルエステル(LA-3-12Me)の合成
配位子LA-3-11Meの合成において2-ブロモ-6-シアノピリジン5gを等モルの2-ブロモ-5-ニトロピリジンに置き換え、その他は同様にして配位子LA-3-12のジメチルエステル体である配位子LA-3-12Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-87を調製した。
配位子LA-3-13のジメチルエステル(LA-3-13Me)の合成
配位子LA-3-11Meの合成において2-ブロモ-6-シアノピリジン5gを等モルの2-ブロモ-6-アセチルピリジンに置き換え、その他は同様にして配位子LA-3-13のジメチルエステル体である配位子LA-3-13Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-85を調製した。
配位子LA-4-3のジメチルエステル(LA-4-3Me)の合成
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-91を調製した。
配位子LA-4-13のジメチルエステル(LA-4-13Me)の合成
配位子LA-4-1Meの合成において2-ブロモピリミジン5gを等モルの2-ブロモベンゾチアゾールに置き換え、その他は同様にして配位子LA-4-13のジメチルエステル体である配位子LA-4-13Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-57を調製した。
配位子LA-5-7のトリメチルエステル(LA-5-7Me)の合成
2-ブロモ-4-メトキシカルボニルピリジンを上記スズ化反応によってスズ化体とし、これと3,5-ジブロモ安息香酸メチルエステルを上記スティルカップリングによって反応させ、配位子LA-5-7のトリメチルエステル体である配位子LA-5-7Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-92を調製した。
配位子LA-6-4のジメチルエステル(LA-6-4Me)の合成
2-ブロモベンゾチアゾールを上記スズ化反応によってスズ化体とし、これと2-(3-ブロモ-5-メトキシカルボニルフェニル)-4-メトキシカルボニルピリジンを上記スティルカップリングによって反応させ、配位子LA-6-4のジメチルエステル体である配位子LA-6-4Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-93を調製した。
配位子LA-7-4のメチルエステル(LA-7-4Me)の合成
配位子LA-4-1Meの合成において6-ブロモ-2,2’-ビピリジン-4,4’-ジカルボキシレートを1/2モルの2、6-ジブロ-4-メトキシカルボニルピリジンに置き換えた他は同様にして配位子LA-7-4のメチルエステル体である配位子LA-7-4Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-94を調製した。
配位子LA-7-8のメチルエステル(LA-7-8Me)の合成
LA-7-4Meの合成において2-ブロモピリミジンを1-ブロモベンゾチアゾールに置き換えた他は同様にしてLA-7-8のメチルエステル体であるLA-7-8Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-95を調製した。
配位子LA-7-10のメチルエステル(LA-7-10Me)の合成
配位子LA-7-4Meの合成において2-ブロモピリミジンを1-ブロモベンズイミダゾールに置き換えた他は同様にして配位子LA-7-10のメチルエステル体である配位子LA-7-10Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-96を調製した。
配位子LA-8-4のメチルエステル(LA-8-4Me)の合成
配位子LA-5-7の合成において2-ブロモ-4-メトキシカルボニルピリジンを2-ブロモピリミジンに置き換えた他は同様にして配位子LA-8-4のメチルエステル体である配位子LA-8-4Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-97を調製した。
配位子LA-8-12のメチルエステル(LA-8-12Me)の合成
配位子LA-5-7の合成において2-ブロモ-4-メトキシカルボニルピリジンを2-ブロモベンゾオキサゾールに置き換えた他は同様にして配位子LA-8-12のメチルエステル体である配位子LA-8-12Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-98を調製した。
配位子LA-8-11のメチルエステル(LA-8-11Me)の合成
配位子LA-5-7の合成において2-ブロモ-4-メトキシカルボニルピリジンを2-ブロモ-3-メチルベンズイミダゾールに置き換えた他は同様にして配位子LA-8-11のメチルエステル体である配位子LA-8-11Meを得た。
別途調製した化合物d-40-2を用いて、例示色素D-15と同様にして例示色素D-99を調製した。
なお、本発明の金属錯体色素は、いずれも500~750nmの範囲であり、光電子変換素子として好ましい範囲であった。
1)計算方法
イ)角θ
上述したようにDFT計算で求めた最安定構造において、G1、G2、Mの座標をそれぞれG1(x1,y1,z1)、G2(x2,y2,z2)、M(x3,y3,z3)とすると、下記式からθが算出できる。
上述したように計算するが、上記原子G1と、上記置換基Rの連結を通じて最も遠い位置に存在する原子とを結ぶ連結鎖の連結鎖数のうちの最大の連結鎖数NR、上記金属原子Mから上記原子G1とを結ぶ連結鎖の連結鎖数のうちの最小の連結鎖数NM-G1の計算結果の例を下記に示す。下記の金属錯体色素では、NR=7、NM-G1=8である。
光電極を構成する半導体電極の半導体層又は光散乱層形成するための種々のペーストを調製し、このペーストを用いて、色素増感太陽電池を作製した。
先ず、光電極を構成する半導体電極の半導体層又は光散乱層形成するためのペーストを下記表3の組成で調製した。なお、この調製は、TiO2粒子もしくはマイカ粒子を媒体に入れて撹拌することによりスラリーを調製し、そこに増粘剤としてセルロース系バインダー(表3ではCBとして標記)を加え、混練することでペーストを得た。
粒子1:アナターゼ、平均粒径;25nm
TiO2粒子2:アナターゼ、平均粒径;200nm
TiO2粒子S1:(棒状粒子)アナターゼ、直径;100nm、アスペクト比;5
TiO2粒子S2:(棒状粒子)アナターゼ、直径;30nm、アスペクト比;6.3
TiO2粒子S3:(棒状粒子)アナターゼ、直径;50nm、アスペクト比;6.1
TiO2粒子S4:(棒状粒子)アナターゼ、直径;75nm、アスペクト比;5.8
TiO2粒子S5:(棒状粒子)アナターゼ、直径;130nm、アスペクト比;5.2
TiO2粒子S6:(棒状粒子)アナターゼ、直径;180nm、アスペクト比;5
TiO2粒子S7:(棒状粒子)アナターゼ、直径;240nm、アスペクト比;5
TiO2粒子S8:(棒状粒子)アナターゼ、直径;110nm、アスペクト比;4.1
TiO2粒子S9:(棒状粒子)アナターゼ、直径;105nm、アスペクト比;3.4
マイカ粒子P1:(板状粒子)直径;100nm、アスペクト比;6
電池特性試験
各色素増感太陽電池(セルA)の短絡電流密度Jsc(mA/cm2)、開放電圧Voc(mV)、フィルファクターFFとともに光電変換効率η(%)を、ソーラーシミュレーター(WACOM製、WXS-85H)を用い、AM1.5フィルターを通したキセノンランプから1000W/m2の疑似太陽光を照射することにより行った。I-Vテスターを用いて電流-電圧特性を測定した。
- 開放電圧Voc(mV) -
上記のようにして得られた開放電圧Voc(mV)は560mV以上を合格とした。
色素増感太陽電池の作製ロット間の性能のバラツキを調べるため、金属錯体色素ごとに10回、色素増感太陽電池(セルA)を上記と全く同様にして繰り返して作製し、これらの各々の開放電圧Voc(mV)を求め、開放電圧Voc(mV)の標準偏差を算出した。
開放電圧Voc(mV)の標準偏差は0.015以上を合格とした。
耐久性として、色素増感太陽電池の耐熱性を開放電圧Voc(mV)の低下率で評価した。
上記のように作製した色素増感太陽電池(セルA)を上記のようにして開放電圧Voc(mV)を測定した後、耐久性として80℃、300時間暗所で経時後に開放電圧Voc(mV)を測定し、低下率(%)を求めた。低下率(%)は、〔(初期の開放電圧-暗所経時後の開放電圧)/初期の開放電圧〕×100により求めた。
低下率8.0%以下を合格とした。
- 脱着速度 -
金属錯体色素の酸化チタン表面への吸着力の評価として、金属錯体色素の酸化チタン表面からの脱着速度を指標とした。
金属錯体色素の脱着速度はQuartz Crystal microbalance with Dissipation monitoring(QCM-D)分子間相互作用測定装置E1(メイワフォーシス株式会社製)により算出した。
QCM-Dに用いる金センサー(メイワフォーシス株式会社製)にペースト2(アナターゼ、平均粒径:25nm)をスクリーン印刷により印刷した(膜厚:20μm)。印刷した金センサーを空気中、450℃で1時間焼成することにより半導体層が吸着した金センサーを作製した。
作製したセンサーをQCM-D分子間相互作用測定装置にセットし、0.2mMの色素溶液(DMF/t-BuOH=1/1)を流すことにより半導体層へ色素を所定値(200μg/cm2)となるように吸着させた。色素吸着量は水晶振動子の共振周波数シフト(△F)から下記のSauerbreyの式により算出した。
脱着速度が15μg/cm2・hr以下を合格とした。
- λmaxシフト -
FTO基板の上にスクリーン印刷により半導体層として前記酸化チタンペースト2を5μmの膜厚で印刷したものを1.0mMの色素溶液にそれぞれ30分~12時間の間で浸し色素を吸着させ、色素吸着量を定量した。色素吸着量は1規定の水酸化テトラブチルアンモニウムメタノール溶液で脱着させ、高速液体クロマトグラフィーで定量した。ここで各色素において70μg/cm2および140μg/cm2の色素吸着密度になる条件下において、別途作製したセルをこの透過スペクトルを測定し、スペクトル形状変化およびλmaxの波長シフトを観察した。測定は分光光度計(U-4100、日立ハイテク社製)を用いて行った。
使用機器:システムコントローラー SCL-10AVP
カラムオーブン CTO-10ASVP
検出器 SPD-10AVVP
デガッサ DGU-14AM
送液ユニット LC-10ADVP(商品名 島津社製)
カラム :YMC-Pack ODS-AM、型番AM-312、
サイズ150×6.0mmI.D.(YMC Co.,Ltd.Japan製)
流量 :0.75mL/min
溶離液 :MeOH/水=80/20(0.02%テトラブチルアンモニウムヒドロキシド含有)
温度 :40℃
検出波長:254nm
λmax2/λmax1が0.9以上を合格とした。
前記電池特性試験によって得られた短絡電流密度Jsc(mA/cm2)を下記の基準で評価した。
短絡電流密度Jsc(mA/cm2)は18.0mA/cm2以上を合格とした。
- 溶液安定性 -
マグネシウムエトキシドで脱水した無水エタノールを溶媒として、下記表4に記載の金属錯体色素を34μMに調整した各色素溶液を調製した。これらの各色素溶液を密閉可能なセルに封入し、メリーゴランド型耐光性試験機(III(N)-500W、イーグルエンジニアリング社製)を用いて70,000Lxの光を照射し、経時でのλmaxの減衰を観察し、色素安定性を以下のようにして評価した。
光照射前の0.1mM溶液をλmaxが吸光度(Abs.)=1になるように一定量の溶媒を加え希釈した。これを色素残存率100%とし、200時間照射後のサンプルに同量の溶媒を加え希釈した際のλmaxの吸光度(Abs.)に100を掛けた値をその時点での色素残存率とした。測定は分光光度計(U-4100(商品名)、日立ハイテク社製)を用いて行った。
色素残存率が70%以上を合格とした。
- 吸着速度 -
金属錯体色素の二酸化チタン表面への吸着速度を以下のようにして測定した。
脱着速度の測定で作製した半導体層が吸着した金センサーを使用し、前記のQCM-D分子間相互作用測定装置にセットし、0.2mMの色素溶液(DMF/t-BuOH=1/1)を流すことにより半導体層へ色素を所定値(0.20mg/cm2)となるように吸着させた。色素吸着量は前記のSauerbreyの式により算出した。色素吸着量が所定値になるまでの時間から色素の吸着速度を求めた。
吸着速度が15μg/cm2・hr以上を合格とした。
ここで、脱着速度は、本発明の金属錯体色素は、いずれも比較の金属錯体色素よりも遅く、なかでもD-15~D-18、D-33、D-82が0.5μg/(cm2・hr)以下で最も好ましく、D-7、D-8、D-12、D-13、D-23、D-26、D-30、D-77、D-79、D-84が1.0~2.0μg/(cm2・hr)の範囲であり、左記に次いで遅く好ましい。
また、吸着速度も、本発明の金属錯体色素は、いずれも比較の金属錯体よりも速く、なかでも、D-61、D-64、D-92~D-99が、特に良好な結果を示した。
このように、本発明の金属錯体色素は、半導体微粒子表面に対する吸着力(吸着速度)に優れ、しかも脱着しにくいため、この点が耐久性の向上に関係するものと思われる。
一方、λmaxシフトの結果から、本発明の金属錯体色素は半導体微粒子上で、色素吸着量が増量してもλmaxの変化が小さく、非効率な会合を起こしにくい色素構造であると推定され、これによって半導体微粒子への電子注入が効率よく進行し、短絡電流密度Jsc(mA/cm2)が向上したものと推測できる。本発明の金属錯体色素のなかでも特にD-9とD-40はλmaxの減少はほとんど起こらなかった。
以下に示す手順により、特開2010-218770号公報に記載の図1に示されているものと同様の構成を有する色素増感太陽電池を作成した。具体的な構成は本願の図面に添付の図3に示した。本願の図3では、51が透明基板、52が透明導電膜、53がバリア層、54がn型半導体電極、55がp型半導体層、56がp型半導体膜、57が対極(57aが対極の突起部)である。
次に、Ti[OCH(CH3)2]4と水とを容積比4:1で混合した溶液5mlを、塩酸塩でpH1に調整されたエチルアルコール溶液40mlと混合し、TiO2前駆体の溶液を調製した。そして、この溶液を、TCOガラス基板上に1000rpmでスピンコートし、ゾル-ゲル合成を行った後、真空下で78℃、45分間加熱し、450℃、30分間のアニーリングを行い、酸化チタン薄膜からなるバリア層53を形成した。
次に、エタノールに、粘度調整剤としてのエチルセルロースを濃度が10質量%となるように溶解させた溶液と、アルコール系有機溶媒(ターピネオール)とを上記で調製した酸化チタンのスラリーに添加し、再度、ホモジナイザーで均質に分散させた。この後、ターピネオール以外のアルコールをエバポレータで除去し、ミキサーで混合して、ペースト状の酸化チタン粒子含有組成物を調製した。なお、調製した酸化チタン粒子含有組成物の組成は、酸化チタン粒子含有組成物を100質量%として、酸化チタン粒子が20質量%、粘度調整剤が5質量%であった。
以下の方法で、光電極にCdSe量子ドット化処理を行い、コバルト錯体を用いた電解液を使用して、図4に示す色素増感太陽電池を作成した。
セレナイド(Se2-)はArやN2雰囲気下、0.068gのNaBH4(0.060Mの濃度となる様に)を0.030MのSeO2エタノール溶液に加えることによって系内で調整した。
同様にして、実施例1と同様のヨウ素及びヨウ化リチウムを含むヨウ素系レドックス溶液を用いて色素増感太陽電池(セルB)を作製した。
電解液に加えたコバルト錯体はChemical Communications,46巻,8788~8790頁(2010年)に記載の方法で調整した。
共存させる共吸着剤として下表7に記載のものを用いた以外は実施例1と同様にして光電変換素子を作成し、同様にして性能の評価を行った。なお、共吸着剤は金属錯体色素の総量1モルに対して20モルを添加した。この共吸着剤を共存させた場合の光電変換効率(η)とこの共吸着剤を含有させない場合の光電変換効率(η’)から光電変換効率の上昇率を、〔(η-η’)/η’〕×100により求めた。
共吸着剤による改良効果を下記のランクで評価した。
A :40%以上60%未満の上昇が見られたもの
B :0%以上40%未満の上昇が見られたもの
C :性能の下降が見られたもの
この結果を下記表7に示した。
特開2004-146425号公報の図2に示されているセルを利用した太陽電池、特開2004-152613号公報の図1に示されている光電極を利用した太陽電池、特開2000-90989号公報に記載の実施例1と同様に作成したタンデムセルを利用した太陽電池、特開2003-217688号公報の図1に示されている色素増感太陽電池を作製して上記と同様の試験を行った。その結果、本発明の金属錯体色素は、いずれも良好な性能が得られることを確認した。
2 感光体層
21 色素
22 半導体微粒子
23 CdSe量子ドット
3 電荷移動体層
4 対極
5 受光電極
6 回路
10 光電変換素子
100 光電気化学電池を利用したシステム
M 電動モーター(扇風機)
40 光電極
41 透明電極
42 半導体電極
43 透明導電膜
44 基板
45 半導体層
46 光散乱層
CE 対極
E 電解質
S スペーサー
51 透明基板
52 透明導電膜
53 バリア層
54 n型半導体電極
55 p型半導体層
56 p型半導体膜
57 対極
57a 突起部
61a 環状の基
62 半導体微粒子表面
Claims (31)
- 導電性支持体上側に、色素が吸着された半導体微粒子の層を有する感光体層と、電解質を含む電荷移動体層と、対極とを有する光電変換素子であって、該色素が、酸性基を少なくとも1つ有する3座の配位子を少なくとも1つ有し、金属原子Mに配位する配位子の少なくとも1つがsp2炭素原子を有し、該sp2炭素原子に、環状の基が結合しており、該sp2炭素原子と直結する該環状の基の原子から炭素原子でつながる環状の位置において、該sp2炭素原子と直結する該環状の基の原子に対してα位またはβ位の原子に、直鎖もしくは分岐のアルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリールオキシ基、アルキルチオ基、シクロアルキルチオ基、アリールチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、シリル基またはシリルオキシ基から選択される置換基Rが置換され、該置換基Rが結合したα位またはβ位の原子をG1とし、該原子G1に直接結合する上記置換基Rの原子をG2とした場合、上記原子G1を中心にした、上記金属原子M、上記原子G1および上記原子G2の成す角θ(∠MG1G2)が150°以下である光電変換素子。
- 前記sp2炭素原子が、環を構成する炭素原子または芳香環と共役したエチレン構造における炭素原子である請求項1に記載の光電変換素子。
- 前記原子G1と、前記置換基Rの連結を通じて最も遠い位置に存在する原子を結ぶ連結鎖の連結鎖数(結合数)のうちの最大の連結鎖数NRが、前記金属原子Mから前記原子G1とを結ぶ連結鎖の連結鎖数(結合数)のうちの最小の連結鎖数NM-G1の1/2倍より多い請求項1または2に記載の光電変換素子。
- 前記最大の連結鎖数NRが、前記最小の連結鎖数NM-G1の1倍より多い請求項3に記載の光電変換素子。
- 前記角θが鋭角であり、かつ前記置換基Rが前記環状の基のα位に結合する請求項1~4のいずれか1項に記載の光電変換素子。
- 前記金属錯体色素が、下記式(I)で表される請求項1~5のいずれか1項に記載の光電変換素子。
M(LD)m1(LA)m2(X)m3・CI・・・式(I)
(式中、MはRuまたはOsを表し、LDは下記式(A)で表される2座または3座の配位子を表し、LAは下記式(B)で表される3座の配位子を表し、Xは単座配位子を表し、CIは電荷を中和させるのに対イオンが必要な場合の対イオンを表す。m1は1または2を表し、m2は1を表し、m3は0または1を表す。)
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
n1は0~3の整数を表し、n2は0~4の整数を表し、n3は1または2を表し、r1は1~3の整数を表し、r2は0~2の整数を表し、l1は0または1を表す。)
Q1~Q3は各々独立に、孤立電子対を有する窒素原子、アニオンを有する窒素原子またはアニオンを有する炭素原子を表す。
D1~D4は各々独立に、炭素原子または窒素原子を表す。) - 前記式(A)において、前記Cyが前記式(A-1)で表される請求項6または7に記載の光電変換素子。
- 前記式(B)が、下記式(B1)~(B8)のいずれかで表される請求項6~9のいずれか1項に記載の光電変換素子。
Zdはベンゼン環、ナフタレン環、アントラセン環、フェナントレン環、ピレン環、ペリレン環、ピロール環、インドール環、イミダゾール環、ベンゾイミダゾール環、ピラゾール環、ピラジン環、ピリミジン環、ベンゾピリミジン環、ピリダジン環、ベンゾピリダジン環、トリアゾール環、ベンゾトリアゾール環、テトラゾール環、インダゾール環、トリアジン環、プリン環、キノリン環、イソキノリン環、キナゾリン環、チアゾール環、ベンゾチアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ベンゾオキサゾール環、フラン環、ベンゾ[b]フラン環、チオフェン環、ベンゾ[b]チオフェン環、ピロリジン環、ピペリジン環、モルホリン環、ピペラジン環、テトラヒドロフラン環、テトラヒドロピラン環、4H-ピラン環、1,4-ジヒドロピリジン環、テトラデヒドロモルホリン環またはテトラデヒドロチオモルホリン環を形成するのに必要な原子群を表す。
Ze~Zgは、ピリジン環以外の5もしくは6員環を形成するのに必要な原子群を表す。
Aは酸性基を表す。
Raはアリール基、ヘテロアリール基、アルキル基、シクロアルキル基、アルコキシ基またはシクロアルコキシ基を表す。ただし、該アルキル基は第3級もしくは第4級炭素原子を有し、該アルコキシ基が第3級もしくは第4級炭素原子を有するか、または該アルコキシ基の酸素原子に直接結合する炭素原子が第2級もしくは第3級炭素原子である。
REWGは電子吸引性基を表す。
RbおよびRcは置換基を表す。
a0は0~2の整数を表す。ただし式(B1)、式(B2)の各々において、a0の少なくとも1つは1または2である。
a1は1または2の整数を表す。
a2は1~4の整数を表し、a3は0~3の整数を表し、a4は0~4の整数を表す。ここで、a2とa3の和は1~4の整数である。
ただし、式(B5)~(B8)においては、少なくとも1つの酸性基を有する。) - 前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B1)である請求項10に記載の光電変換素子。
- 前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B2)である請求項10に記載の光電変換素子。
- 前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B3)または(B4)である請求項10に記載の光電変換素子。
- 前記式(I)において前記LDが、前記式(A-3)であり、かつ前記LAが、前記式(B5)~(B8)のいずれかである請求項10に記載の光電変換素子。
- 前記LDが下記式(A-4)で表される配位子である請求項6~14のいずれか1項に記載の光電変換素子。
Rdは、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アルキルチオ基、シクロアルキルチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、ハロゲン原子、シアノ基、アルコキシカルボニル基、シクロアルコキシカルボニル基または芳香族性基を表す。
b1は0~2の整数を表す。b1が2のとき、2個のRd同士が互いに結合して環を形成してもよい。) - 前記LDが下記式(A-5)で表される配位子である請求項6~14のいずれか1項に記載の光電変換素子。
Rdは、アルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アルキルチオ基、シクロアルキルチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、ハロゲン原子、シアノ基、アルコキシカルボニル基、シクロアルコキシカルボニル基または芳香族性基を表す。
b1は0~2の整数を表す。b1が2のとき、2個のRd同士が互いに結合して環を形成してもよい。) - 前記環Aまたは環Bが、チオフェン環またはベンゼン環である請求項7~16のいずれか1項に記載の光電変換素子。
- 前記半導体微粒子に、さらに、酸性基を1つ以上有する共吸着剤が担持されている請求項1~17のいずれか1項に記載の光電変換素子。
- 前記電解質中に含有するレドックス系化合物がコバルト錯体である請求項1~19のいずれか1項に記載の光電変換素子。
- 請求項1~20のいずれか1項に記載の光電変換素子を含有する色素増感太陽電池。
- 酸性基を少なくとも1つ有する3座の配位子を少なくとも1つ有し、金属原子Mに配位する配位子の少なくとも1つがsp2炭素原子を有し、該sp2炭素原子に、環状の基が結合しており、該sp2炭素原子と直結する該環状の基の原子から炭素原子でつながる環状の位置において、該sp2炭素原子と直結する該環状の基の原子に対してα位またはβ位の原子に、直鎖もしくは分岐のアルキル基、シクロアルキル基、アルコキシ基、シクロアルコキシ基、アリールオキシ基、アルキルチオ基、シクロアルキルチオ基、アリールチオ基、アミノ基、アルキルアミノ基、シクロアルキルアミノ基、アリールアミノ基、ヘテロ環アミノ基、シリル基またはシリルオキシ基から選択される置換基Rが置換され、該置換基Rが結合したα位またはβ位の原子をG1とし、該原子G1に直接結合する上記置換基Rの原子をG2とした場合、上記原子G1を中心にした、上記金属原子M、上記原子G1および上記原子G2の成す角θ(∠MG1G2)が150°以下である金属錯体色素。
- 下記式(I)で表される金属錯体色素。
M(LD)m1(LA)m2(X)m3・CI・・・式(I)
(式中、MはRuまたはOsを表し、LDは下記式(A)で表される2座または3座の配位子を表し、LAは下記式(B)で表される3座の配位子を表し、Xは単座配位子を表し、CIは電荷を中和させるのに対イオンが必要な場合の対イオンを表す。m1は1または2を表し、m2は1を表し、m3は0または1を表す。)
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
n1は0~3の整数を表し、n2は0~4の整数を表し、n3は1または2を表し、r1は1~3の整数を表し、r2は0~2の整数を表し、l1は0または1を表す。)
Q1~Q3は各々独立に、孤立電子対を有する窒素原子、アニオンを有する窒素原子またはアニオンを有する炭素原子を表す。
D1~D4は各々独立に、炭素原子または窒素原子を表す。) - 前記LDが下記式(A-3)であり、前記LAが下記式(B1)~(B8)のいずれかである請求項23に記載の金属錯体色素。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
l1は0または1を表し、n1は0~3の整数を表し、n2は0~4の整数を表し、r2は0~2の整数を表す。R1が複数存在する場合は、互いに結合して縮環してもよい。
環Aは、5員環または6員環の環状の基を表す。ただし、RおよびR1が結合して環を形成することはない。ここで、上記基の結合手の原子からRが結合する位置の間に記載されている破線は、この部分が単結合であっても二重結合であってもよいことを意味する。)
Zdはベンゼン環、ナフタレン環、アントラセン環、フェナントレン環、ピレン環、ペリレン環、ピロール環、インドール環、イミダゾール環、ベンゾイミダゾール環、ピラゾール環、ピラジン環、ピリミジン環、ベンゾピリミジン環、ピリダジン環、ベンゾピリダジン環、トリアゾール環、ベンゾトリアゾール環、テトラゾール環、インダゾール環、トリアジン環、プリン環、キノリン環、イソキノリン環、キナゾリン環、チアゾール環、ベンゾチアゾール環、イソチアゾール環、オキサゾール環、イソオキサゾール環、ベンゾオキサゾール環、フラン環、ベンゾ[b]フラン環、チオフェン環、ベンゾ[b]チオフェン環、ピロリジン環、ピペリジン環、モルホリン環、ピペラジン環、テトラヒドロフラン環、テトラヒドロピラン環、4H-ピラン環、1,4-ジヒドロピリジン環、テトラデヒドロモルホリン環またはテトラデヒドロチオモルホリン環を形成するのに必要な原子群を表す。
Ze~Zgは、ピリジン環以外の5もしくは6員環を形成するのに必要な原子群を表す。
Aは酸性基を表す。
Raはアリール基、ヘテロアリール基、アルキル基、シクロアルキル基、アルコキシ基またはシクロアルコキシ基を表す。ただし、該アルキル基は第3級もしくは第4級炭素原子を有し、該アルコキシ基が第3級もしくは第4級炭素原子を有するか、または該アルコキシ基の酸素原子に直接結合する炭素原子が第2級もしくは第3級炭素原子である。
REWGは電子吸引性基を表す。
RbおよびRcは置換基を表す。
a0は0~2の整数を表す。ただし式(B1)、式(B2)の各々において、a0の少なくとも1つは1または2である。
a1は1または2の整数を表す。
a2は1~4の整数を表し、a3は0~3の整数を表し、a4は0~4の整数を表す。ここで、a2とa3の和は1~4の整数である。
ただし、式(B5)~(B8)においては、少なくとも1つの酸性基を有する。) - 請求項22~24のいずれか1項に記載の金属錯体色素を溶解してなる色素溶液。
- 有機溶媒中に、前記金属錯体色素を0.001~0.1質量%含有させ、水を0.1質量%以下に抑えてなる請求項25に記載の色素溶液。
- 前記色素溶液が、さらに共吸着剤を含有する請求項25または26に記載の色素溶液。
- 下記式(A-3)で表される化合物。
Ar1およびAr2は各々独立にアニオンを有する炭素環芳香族基、孤立電子対を有する含窒素芳香族基、またはアニオンを有する含窒素芳香族基を表す。
Lは、エテニレン基、エチニレン基、アリーレン基またはヘテロアリーレン基を表す。
l1は0または1を表し、n1は0~3の整数を表し、n2は0~4の整数を表し、r2は0~2の整数を表す。
環Aは、5員環または6員環の環状の基を表す。ただし、RおよびR1が結合して環を形成することはない。ここで、上記基の結合手の原子からRが結合する位置の間に記載されている破線は、この部分が単結合であっても二重結合であってもよいことを意味する。)
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US20140290746A1 (en) | 2014-10-02 |
US9564274B2 (en) | 2017-02-07 |
TWI598409B (zh) | 2017-09-11 |
KR101930982B1 (ko) | 2018-12-19 |
CN103988362B (zh) | 2016-05-04 |
EP2793311A1 (en) | 2014-10-22 |
EP2793311B1 (en) | 2019-06-19 |
KR20140105517A (ko) | 2014-09-01 |
TW201634595A (zh) | 2016-10-01 |
TW201326318A (zh) | 2013-07-01 |
TWI609054B (zh) | 2017-12-21 |
EP2793311A4 (en) | 2015-07-29 |
CN103988362A (zh) | 2014-08-13 |
JP5881578B2 (ja) | 2016-03-09 |
JP2013229285A (ja) | 2013-11-07 |
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