WO2016027675A1 - 光電変換素子ならびにそれを用いたイメージセンサ、太陽電池、単色検知センサおよびフレキシブルセンサ - Google Patents
光電変換素子ならびにそれを用いたイメージセンサ、太陽電池、単色検知センサおよびフレキシブルセンサ Download PDFInfo
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- WO2016027675A1 WO2016027675A1 PCT/JP2015/072229 JP2015072229W WO2016027675A1 WO 2016027675 A1 WO2016027675 A1 WO 2016027675A1 JP 2015072229 W JP2015072229 W JP 2015072229W WO 2016027675 A1 WO2016027675 A1 WO 2016027675A1
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- QKTRRACPJVYJNU-UHFFFAOYSA-N thiadiazolo[5,4-b]pyridine Chemical class C1=CN=C2SN=NC2=C1 QKTRRACPJVYJNU-UHFFFAOYSA-N 0.000 description 1
- GZNAASVAJNXPPW-UHFFFAOYSA-M tin(4+) chloride dihydrate Chemical compound O.O.[Cl-].[Sn+4] GZNAASVAJNXPPW-UHFFFAOYSA-M 0.000 description 1
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- JFLKFZNIIQFQBS-FNCQTZNRSA-N trans,trans-1,4-Diphenyl-1,3-butadiene Chemical group C=1C=CC=CC=1\C=C\C=C\C1=CC=CC=C1 JFLKFZNIIQFQBS-FNCQTZNRSA-N 0.000 description 1
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- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/20—Polycyclic condensed hydrocarbons
- C07C15/38—Polycyclic condensed hydrocarbons containing four rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
- C07D307/79—Benzo [b] furans; Hydrogenated benzo [b] furans with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the hetero ring
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- H10K30/20—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising organic-organic junctions, e.g. donor-acceptor junctions
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- H10K39/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic radiation-sensitive element covered by group H10K30/00
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- H10K39/30—Devices controlled by radiation
- H10K39/32—Organic image sensors
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
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- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
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- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
- H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/621—Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide
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- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/623—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing five rings, e.g. pentacene
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- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6574—Polycyclic condensed heteroaromatic hydrocarbons comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/02—Ortho- or ortho- and peri-condensed systems
- C07C2603/40—Ortho- or ortho- and peri-condensed systems containing four condensed rings
- C07C2603/42—Ortho- or ortho- and peri-condensed systems containing four condensed rings containing only six-membered rings
- C07C2603/44—Naphthacenes; Hydrogenated naphthacenes
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/02—Ortho- or ortho- and peri-condensed systems
- C07C2603/52—Ortho- or ortho- and peri-condensed systems containing five condensed rings
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- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/30—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising bulk heterojunctions, e.g. interpenetrating networks of donor and acceptor material domains
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- 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
- Y02E10/549—Organic PV cells
Definitions
- the present invention relates to a photoelectric conversion element that can convert fluorescent light into electrical energy. More specifically, the present invention relates to a photoelectric conversion element that can be used in fields such as solar cells and image sensors.
- a photoelectric conversion element that can convert light into electrical energy can be used for solar cells, image sensors, and the like.
- image sensors that read current generated from incident light by a photoelectric conversion element using a CCD or a CMOS circuit are widely used.
- an image sensor using a photoelectric conversion element has used an inorganic substance as a material constituting the photoelectric conversion film.
- inorganic materials have low color selectivity (absorption of specific wavelengths)
- each color (red, green and blue) in the incident light is selectively transmitted using a color filter, and each photoelectric conversion film is used to transmit each color. It was necessary to absorb the color light.
- a color filter when a fine target is photographed, the pitch of the target interferes with the pitch of the image sensor, and an image (moire defect) different from the original image is generated.
- an optical lens or the like is required, but there is a disadvantage that the light use efficiency and the aperture ratio are lowered by the color filter and the optical lens.
- Patent Document 1 discloses an organic photoelectric material including a compound having a thiophene-containing aromatic group in which an aromatic ring is condensed.
- Patent Document 1 a thiophene compound having a large absorption coefficient (hereinafter, a compound of Patent Document 1) is used. Although the photoelectric conversion element using the compound of this patent document 1 shows a comparatively high photoelectric conversion efficiency, the further improvement of the photoelectric conversion efficiency was calculated
- an object of the present invention is to solve the problems of the prior art and provide a photoelectric conversion element having higher photoelectric conversion efficiency.
- the inventors of the present application paid attention to the charge mobility of the photoelectric conversion element in order to solve the above problems. That is, while the photoelectric conversion element using the compound of Patent Document 1 showed relatively high photoelectric conversion efficiency, the photoelectric conversion element using the other light-absorbing compound did not show sufficient photoelectric conversion efficiency. This is considered because the compound of Patent Document 1 has sufficient charge mobility, and the other light-absorbing compound did not have sufficient charge mobility. Therefore, an attempt was made to increase the charge mobility of the other light-absorbing compound, but it was difficult to design and synthesize a molecule that would increase the charge mobility while maintaining a large absorption coefficient. Thus, the inventors have conceived of improving the photoelectric conversion efficiency of a photoelectric conversion element using the other light-absorbing compound by combining the other light-absorbing compound with a compound having sufficient charge mobility.
- the inventors of the present application first examined naphthacene as a compound having charge mobility. However, with naphthacene, even when combined with the other light-absorbing compounds, high photoelectric conversion efficiency was not obtained.
- the inventors of the present application have further studied and found that a high photoelectric conversion efficiency can be obtained by combining a condensed ring aromatic compound having a specific structure with the other light-absorbing compound. That is, the present invention is as follows.
- a photoelectric conversion element having at least one organic layer between a first electrode and a second electrode, wherein the organic compound has a first compound represented by the following general formula (1) and a wavelength of 400 to 700 nm.
- a photoelectric conversion element comprising a second compound having a maximum absorption coefficient of 5 ⁇ 10 4 cm ⁇ 1 or more.
- R 13 is a group selected from the group consisting of R 14.
- R 13 and R 14 are an aryl group or a heteroaryl group, and adjacent substituents may be bonded to each other to form a ring structure.
- R 5 and R 12 in the general formula (1) are groups represented by the following general formula (2) or the following general formula (3).
- R 15 to R 24 may be the same or different from each other, and hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group , Alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, nitro group, cyano group, silyl group and- It is a group selected from the group consisting of P ( ⁇ O) R 13 R 14 .
- R 13 and R 14 are an aryl group or a heteroaryl group.
- R 16 to R 19 and R 21 to R 24 may form a ring with adjacent substituents.
- X is an oxygen atom, a sulfur atom or —NR 25 .
- R 25 is hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group or a heteroaryl group.
- a photoelectric conversion element having high photoelectric conversion efficiency can be provided.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention The schematic cross section which shows an example of the photoelectric conversion element of this invention.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention The schematic cross section which shows an example of the photoelectric conversion element of this invention.
- the schematic cross section which shows an example of the photoelectric conversion element of this invention The schematic cross section which shows an example of the laminated structure of the photoelectric conversion element in the image sensor of this invention.
- the photoelectric conversion element of the present invention is a photoelectric conversion element in which at least one organic layer exists between the first electrode and the second electrode, and the first organic layer is represented by the following general formula (1).
- R 1 to R 12 may be the same or different, and are hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group.
- Aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, nitro group, cyano group, silyl group and -P ( O)
- R It is a group selected from the group consisting of 13 R 14 .
- R 13 and R 14 are an aryl group or a heteroaryl group. Adjacent substituents may be bonded to each other to form a ring structure.
- R 5 and R 12 in the general formula (1) are groups represented by the following general formula (2) or the following general formula (3).
- R 15 to R 24 may be the same or different from each other, and hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group , Alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, nitro group, cyano group, silyl group and- It is a group selected from the group consisting of P ( ⁇ O) R 13 R 14 .
- R 13 and R 14 are an aryl group or a heteroaryl group.
- R 16 to R 19 and R 21 to R 24 may form a ring with adjacent substituents.
- X is an oxygen atom, a sulfur atom or —NR 25 .
- R 25 is hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group or a heteroaryl group.
- first compound represented by the general formula (1)
- second compound having a maximum absorption coefficient at a wavelength of 400 to 700 nm of 5 ⁇ 10 4 cm ⁇ 1 or more
- 1 to 4 show examples of the photoelectric conversion element of the present invention.
- FIG. 1 is an example of a photoelectric conversion element having a first electrode 10, a second electrode 20, and one organic layer 11 interposed therebetween.
- the organic layer 11 in FIG. 1 is a photoelectric conversion layer 15 that converts light into electrical energy.
- the organic layer in this invention represents the layer containing an organic compound, for example, a photoelectric converting layer, a charge blocking layer, etc. are mentioned.
- a charge blocking layer may be inserted between the cathode and the anode as shown in FIGS.
- This charge blocking layer is a layer having a function of blocking electrons or holes, and is inserted between the electron blocking layer 13 and the anode and the photoelectric conversion layer 15 when inserted between the cathode and the photoelectric conversion layer. When inserted, it functions as a hole blocking layer 17.
- the photoelectric conversion element may include only one of these charge blocking layers (FIGS. 2 and 3) or both (FIG. 4).
- the photoelectric conversion layer when the photoelectric conversion layer is composed of two or more types of photoelectric conversion materials, the photoelectric conversion layer may be a single layer in which two or more types of photoelectric conversion materials are mixed, or each one of one or more types of photoelectric conversion materials. A plurality of layers may be laminated. Furthermore, the structure by which the mixed layer and each single layer were mixed may be sufficient.
- R 1 to R 12 may be the same or different, and are hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group.
- Aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, nitro group, cyano group, silyl group and -P ( O)
- R It is a group selected from the group consisting of 13 R 14 .
- R 13 and R 14 are an aryl group or a heteroaryl group. Adjacent substituents may be bonded to each other to form a ring structure.
- hydrogen may contain deuterium.
- the alkyl group represents, for example, a saturated aliphatic hydrocarbon group such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, or a tert-butyl group, which is a substituent. It may or may not have.
- the additional substituent when it is substituted and examples thereof include an alkyl group, an aryl group, a heteroaryl group, and the like. This point includes the following cycloalkyl groups and heterocyclic groups. The same applies to additional substituents when each substituent is substituted.
- the number of carbon atoms of the alkyl group is not particularly limited, but is usually in the range of 1 to 20 and more preferably 1 to 8 from the viewpoint of availability and cost.
- the carbon number of the additional substituent shall be included in the carbon number of the alkyl group.
- the carbon number of each substituent when each substituent such as the following cycloalkyl group and heterocyclic group is substituted shall also include the carbon number of the additional substituent.
- the cycloalkyl group represents, for example, a saturated alicyclic hydrocarbon group such as cyclopropyl, cyclohexyl, norbornyl, adamantyl, etc., which may or may not have a substituent.
- carbon number of an alkyl group part is not specifically limited, Usually, it is the range of 3-20.
- the heterocyclic group refers to an aliphatic ring having atoms other than carbon, such as a pyran ring, a piperidine ring, and a cyclic amide, in the ring, which may or may not have a substituent. .
- carbon number of a heterocyclic group is not specifically limited, Usually, it is the range of 2-20.
- alkenyl group refers to an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- carbon number of an alkenyl group is not specifically limited, Usually, it is the range of 2-20.
- the cycloalkenyl group refers to an unsaturated alicyclic hydrocarbon group containing a double bond such as a cyclopentenyl group, a cyclopentadienyl group, or a cyclohexenyl group, which may have a substituent. You don't have to. Although carbon number of a cycloalkenyl group is not specifically limited, Usually, it is the range of 2-20.
- the alkynyl group indicates, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- carbon number of an alkynyl group is not specifically limited, Usually, it is the range of 2-20.
- the alkoxy group refers to, for example, a functional group having an aliphatic hydrocarbon group bonded through an ether bond such as a methoxy group, an ethoxy group, or a propoxy group, and the aliphatic hydrocarbon group may have a substituent. It may not have. Although carbon number of an alkoxy group is not specifically limited, Usually, it is the range of 1-20.
- the alkylthio group is a group in which an oxygen atom of an ether bond of an alkoxy group is substituted with a sulfur atom.
- the hydrocarbon group of the alkylthio group may or may not have a substituent. Although carbon number of an alkylthio group is not specifically limited, Usually, it is the range of 1-20.
- An aryl ether group refers to a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and the aromatic hydrocarbon group may or may not have a substituent. Good. Although carbon number of an aryl ether group is not specifically limited, Usually, it is the range of 6-40.
- the aryl thioether group is a group in which an oxygen atom of an ether bond of an aryl ether group is substituted with a sulfur atom.
- the aromatic hydrocarbon group in the aryl ether group may or may not have a substituent. Although carbon number of an aryl ether group is not specifically limited, Usually, it is the range of 6-40.
- An aryl group refers to an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, a biphenyl group, a fluorenyl group, a phenanthryl group, a triphenylenyl group, or a terphenyl group.
- the aryl group may or may not have a substituent. Although carbon number of an aryl group is not specifically limited, Usually, it is the range of 6-40.
- a heteroaryl group is one or more atoms other than carbon such as furanyl, thiophenyl, pyridyl, quinolinyl, pyrazinyl, pyrimidinyl, triazinyl, naphthyridyl, benzofuranyl, benzothiophenyl, indolyl, etc.
- a cyclic aromatic group contained in an individual ring is shown, which may or may not have a substituent.
- carbon number of heteroaryl group is not specifically limited, Usually, it is the range of 2-30.
- Halogen means fluorine, chlorine, bromine and iodine.
- the amino group may or may not have a substituent.
- substituents include an aryl group and a heteroaryl group, and these substituents may be further substituted.
- the silyl group refers to, for example, a functional group having a bond to a silicon atom such as a trimethylsilyl group, which may or may not have a substituent.
- carbon number of a silyl group is not specifically limited, Usually, it is the range of 3-20.
- the number of silicon is usually in the range of 1 to 6.
- —P ( ⁇ O) R 11 R 12 may or may not have a substituent.
- substituents include an aryl group and a heteroaryl group, and these substituents may be further substituted.
- arbitrary adjacent 2 substituents may be bonded to each other to form a conjugated or non-conjugated condensed ring.
- R 1 and R 2 may form a ring to form a total of five condensed rings because charge mobility is improved.
- Benzo [a] naphthacene is particularly preferable as a structure in which five condensed rings are formed in total.
- an element selected from nitrogen, oxygen, sulfur, phosphorus, and silicon may be included in addition to carbon.
- the condensed ring may be further condensed with another ring.
- R 5 and R 12 in the general formula (1) are groups represented by the general formula (2) or the general formula (3).
- R 15 to R 24 may be the same or different from each other, and hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group , Alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, amino group, nitro group, cyano group, silyl group and- It is a group selected from the group consisting of P ( ⁇ O) R 13 R 14 .
- R 13 and R 14 are an aryl group or a heteroaryl group.
- R 16 to R 19 and R 21 to R 24 may form a ring with adjacent substituents.
- X is an oxygen atom, a sulfur atom or —NR 25 .
- R 25 is hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group or a heteroaryl group.
- the compound having the group represented by the general formula (2) has an aryl group, the charge transfer between molecules by ⁇ electrons is smoothly performed and has high charge mobility. Therefore, it greatly contributes to the improvement of external quantum efficiency.
- R 15 is an alkyl group, an alkoxy group, an aryl group or a heteroaryl group in the group represented by the general formula (2), molecular interaction between naphthacene skeletons is suppressed, and high photoelectric conversion efficiency is possible. At the same time, a stable thin film can be formed, which is preferable.
- R 15 is an alkyl group having 1 to 20 carbon atoms, an alkoxy group, an aryl group having 4 to 14 carbon atoms, or a heteroaryl group
- R 17 and R 18 it becomes easy to obtain raw materials and a synthesis process, and the cost can be reduced. Therefore, it is more preferable.
- the compound having a group represented by the general formula (3) has a bicyclic benzoheterocycle, and therefore, a high glass transition temperature (Tg) can be secured, which is preferable in terms of high heat resistance.
- Tg glass transition temperature
- R 20 is an alkyl group, an alkoxy group, an aryl group or a heteroaryl group in the group represented by the general formula (3), molecular interaction between naphthacene skeletons is suppressed, and high photoelectric conversion efficiency is possible. At the same time, a stable thin film can be formed, which is preferable.
- R 20 is an alkyl group having 1 to 20 carbon atoms, an alkoxy group, an aryl group having 4 to 14 carbon atoms, or a heteroaryl group
- the raw materials can be easily obtained and the synthesis process can be facilitated, and the cost can be reduced. Therefore, it is more preferable.
- alkyl group and alkoxy group having 1 to 20 carbon atoms examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, and cyclopentyl.
- n-hexyl group, cyclohexyl group, adamantyl group, methoxy group, ethoxy group, n-propyloxy group, isopropyloxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, n-pentoxy group, cyclo Examples include a pentoxy group, an n-hexyloxy group, and a cyclohexyloxy group. Among them, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl groups, high photoelectric conversion efficiency, thin film stability, and availability of raw materials and ease of synthesis process A methoxy group is preferred.
- Examples of the aryl group and heteroaryl group having 4 to 14 carbon atoms include phenyl group, naphthyl group, phenanthryl group, anthracenyl group, fluorenyl group, furanyl group, thiophenyl group, pyrrolyl group, benzofuranyl group, benzothiophenyl group, indolyl group Benzoxazolyl group, benzothiazolyl group, benzimidazolyl group, pyridyl group, quinolinyl group, quinoxanyl group, cavazolyl group, and venatrolyl group.
- phenyl group is preferred.
- naphthyl group is preferred.
- phenanthryl group is preferred.
- fluorenyl group is preferred.
- benzofuranyl group is preferred.
- benzothiophenyl group is preferred.
- pyridyl group is preferred.
- the aryl group and heteroaryl group may further have a substituent.
- substituents in this case include alkyl groups such as methyl, ethyl, propyl, and tert-butyl groups, alkoxy groups such as methoxy and ethoxy groups, aryl ether groups such as phenoxy groups, phenyl groups, and naphthyl groups.
- An aryl group such as biphenyl group, and a heteroaryl group such as pyridyl group, quinolinyl group, benzofuranyl group, and benzothiophenyl group are preferable.
- a methyl group, a tert-butyl group, and a phenyl group are particularly preferable from the viewpoint of availability of raw materials and a synthesis process.
- X in the general formula (3) is an oxygen atom because higher photoelectric conversion efficiency can be obtained.
- R 1 to R 4 , R 6 to R 11 , R 16 to R 19 , and R 21 to R 24 are hydrogen or deuterium from the viewpoint that vapor deposition becomes easier as the molecular weight of the first compound is lower. It is preferable.
- a known method can be used for the synthesis of the first compound represented by the general formula (1).
- the method for introducing the group represented by the general formula (2) or the general formula (3) into the naphthacene skeleton of the first compound is, for example, a method using a coupling reaction between a naphthoquinone derivative and an organometallic reagent, or a halogenated naphthacene derivative.
- a method using a coupling reaction between a boronic acid reagent and a boronic acid reagent under a palladium or nickel catalyst but are not limited thereto.
- Specific examples of the first compound represented by the general formula (1) include the following.
- the second compound having a maximum absorption coefficient at a wavelength of 400 to 700 nm in the present invention of 5 ⁇ 10 4 cm ⁇ 1 or more will be described.
- the maximum absorption coefficient maximum value is determined.
- the first compound represented by the general formula (1) Since the first compound represented by the general formula (1) has a high charge mobility, it is excellent in the ability to efficiently transport the generated charges to the electrode. There is a small nature. Specifically, the absorption coefficient of the first compound represented by the general formula (1) depends on the type of substituent introduced into the naphthacene skeleton, but is 1 ⁇ 10 4 cm ⁇ 1 to 5 ⁇ 10 4 cm. -1 . This value is almost the same as the absorption coefficient (about 10 4 cm ⁇ 1 ) of an inorganic thin film such as silicon crystal. Therefore, the first compound represented by the general formula (1) alone cannot sufficiently absorb incident light, and most of the light is transmitted to cause optical loss, resulting in a decrease in photoelectric conversion efficiency. .
- the organic layer includes both the first compound represented by the general formula (1) and the second compound having a maximum absorption coefficient of 5 ⁇ 10 4 cm ⁇ 1 or more at a wavelength of 400 to 700 nm.
- the second compound with a large absorption coefficient has a role of light absorption, and both the first compound and the second compound have the role of charge transport, so that both light absorption and charge mobility are compatible. Therefore, photoelectric conversion performance can be expressed.
- these compounds are particularly preferably contained in the photoelectric conversion layer among the organic layers.
- it is not restricted to the structure which contains these compounds only in a photoelectric converting layer.
- these layers may include a first compound and a second compound.
- the electron blocking layer or the hole blocking layer may contain a second compound.
- it is preferably 5 ⁇ 10 4 cm ⁇ 1 or more, more preferably It is 8 ⁇ 10 4 cm ⁇ 1 or more, more preferably 1 ⁇ 10 5 cm ⁇ 1 or more.
- a pigment-based material is preferably mentioned in terms of good light absorption.
- Specific examples include derivatives such as merocyanine, coumarin, nile red, rhodamine, oxazine, acridine, squalium, diketopyrrolopyrrole, pyromethene, pyrene, perylene, thiophene, and phthalocyanine.
- a material having a single peak absorption at a wavelength of 400 to 700 nm is preferably used.
- Specific examples of the material having such a large absorption coefficient of 1 ⁇ 10 5 cm ⁇ 1 or more include thiophene derivatives, pyrene derivatives, and perylene derivatives.
- the thiophene derivative is preferably a compound represented by the general formula (4).
- R 25 to R 28 may be the same or different and are each hydrogen, alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group.
- R 29 and R 30 are an aryl group or a heteroaryl group.
- m is an integer of 1-6.
- at least one of R 25 to R 28 is a group represented by the following general formula (5).
- n is 1 or 2.
- L is an alkenediyl group, an arenediyl group or a heteroarenediyl group.
- L is an alkenetriyl group, an arenetriyl group or a heteroarenetriyl group.
- the compound represented by the general formula (4) is a compound having a high light absorption coefficient and a good color selectivity having a single peak absorption.
- m an integer from 1 to 6, an absorption region is provided in the wavelength range of 400 to 700 nm.
- m is preferably 2 to 4, and m is particularly preferably 3.
- the absorption wavelength can be controlled by appropriately selecting the type of substituents R 25 to R 28 .
- the compound represented by the general formula (4) as the second compound is at least one of R 25 to R 28 represented by the general formula (5). By using the group represented, it functions as an n-type semiconductor material having good electron transport properties.
- the pyrene derivative is preferably a compound represented by the general formula (6).
- R 35 and R 36 are an aryl group or a heteroaryl group.
- at least one of R 31 to R 34 is a group represented by the following general formula (5).
- n is 1 or 2.
- L is an alkenediyl group, an arenediyl group or a heteroarenediyl group.
- L is an alkenetriyl group, an arenetriyl group or a heteroarenetriyl group.
- the compound represented by the general formula (6) is a compound having a single peak absorption and good color selectivity.
- the absorption wavelength can be controlled by appropriately selecting the type of substituent of R 31 to R 34 .
- n has an absorption region in the wavelength range of 400 to 700 nm and has good electron transport properties. This is preferable because it functions as a type semiconductor material.
- the perylene derivative is preferably a compound represented by the general formula (7).
- R 37 and R 38 may be the same or different and each represents hydrogen, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether A group selected from the group consisting of a group, an aryl group, a heteroaryl group, a halogen, an amino group, a cyano group, a silyl group, and —P ( ⁇ O) R 39 R 40 .
- R 39 and R 40 are an aryl group or a heteroaryl group.
- the compound represented by the general formula (7) is a compound having a high light absorption coefficient and good color selectivity.
- the absorption wavelength can be controlled by appropriately setting the type of substituent of R 37 and R 38 . Since the compound represented by the general formula (7) has good electron transport properties, it is preferably used as an n-type semiconductor.
- the absorption coefficient in this specification is a ratio of light absorbed per unit length when traveling through the thin film, and is calculated by substituting into the formula (absorbance) / (film thickness). It is the value.
- an organic compound is deposited on a transparent quartz glass having a thickness of 0.7 mm by a vacuum deposition method at a deposition rate of 1 kg / second to a film thickness of 50 nm, and an ultraviolet / visible spectrophotometer. After measuring the absorbance in the visible region of 400 nm to 700 nm, the absorption coefficient is calculated by dividing the maximum absorbance value by the film thickness (unit: cm) of the organic compound.
- the first compound represented by the general formula (1) can be used as a p-type semiconductor material or an n-type semiconductor material depending on the relative ionization potential and the electron affinity of the second compound. It is preferable to use it as a semiconductor material. In particular, since the first compound represented by the general formula (1) includes a group represented by the general formula (2) or the general formula (3), the hole-transporting property is excellent. It is preferable to use it as a semiconductor material.
- the second compound is preferably an n-type semiconductor material.
- the p-type semiconductor material refers to a hole-transporting semiconductor material that has an electron-donating property and easily emits electrons (low ionization potential).
- the n-type semiconductor material refers to an electron-transporting semiconductor material that has an electron-accepting property and a property of easily receiving electrons (high electron affinity).
- the cathode and the anode have a role for allowing electrons and holes made in the photoelectric conversion element to flow and sufficient current to flow.
- the cathode formed on the substrate is a transparent electrode.
- the cathode may be transparent so that holes can be efficiently extracted from the photoelectric conversion layer and light can enter.
- the cathode material may be a conductive metal oxide such as tin oxide, indium oxide or indium tin oxide (ITO), or a metal such as gold, silver or chromium, copper iodide or copper sulfide.
- Inorganic conductive materials, conductive polymers such as polythiophene, polypyrrole, and polyaniline are preferable.
- ITO glass having ITO on the glass substrate surface or nesa glass having tin oxide on the glass substrate surface is used. It is particularly preferred.
- the resistance of the transparent electrode only needs to allow a current generated by the photoelectric conversion element to flow sufficiently.
- the resistance of the transparent electrode is preferably low.
- an ITO substrate having a resistance of 300 ⁇ / ⁇ or less functions as an element electrode, so that it is particularly preferable to use a low resistance product.
- the thickness of ITO or tin oxide can be arbitrarily selected according to the resistance value, but is usually used in a range of 50 to 300 nm. Further, soda lime glass, non-alkali glass, or the like is used for the glass substrate of ITO glass or Nesa glass. Since the thickness of the glass substrate only needs to be sufficient to maintain the mechanical strength, 0.5 mm or more is sufficient.
- the material of the glass substrate is preferably alkali-free glass because it is better that there are fewer ions eluted from the glass substrate, and soda lime glass with a barrier coating such as SiO 2 can also be used.
- the cathode functions stably, the substrate does not have to be glass.
- the cathode may be formed on a plastic substrate.
- the ITO film forming method is not particularly limited, such as an electron beam method, a sputtering method, or a chemical reaction method.
- the anode is preferably a substance that can efficiently extract electrons from the photoelectric conversion layer.
- Lithium, sodium, potassium, calcium, magnesium, cesium or alloys containing these low work function metals are effective for improving the device characteristics by increasing the electron extraction efficiency.
- these low work function metals are generally unstable in the atmosphere.
- the hole blocking layer is doped with a small amount of lithium, magnesium, or cesium (1 nm or less as indicated by a vacuum deposition thickness gauge).
- a method using a highly stable electrode can be given as a preferred example.
- An inorganic salt such as lithium fluoride can also be used.
- metals such as platinum, gold, silver, copper, iron, tin, aluminum, indium, or alloys using these metals, and inorganic substances such as silica, titania, silicon nitride, polyvinyl alcohol, vinyl chloride, It is preferable to laminate a hydrocarbon polymer or the like. These electrodes are preferably produced by resistance heating, electron beam, sputtering, ion plating, coating or the like.
- the photoelectric conversion element of the present invention When the photoelectric conversion element of the present invention is used as an image sensor, when an electric field is applied between the anode and the cathode, electrons generated in the photoelectric conversion layer are guided to the anode side and holes are guided to the cathode side. As a result, the photoelectric conversion efficiency is improved.
- the applied voltage is preferably 10 5 V / m or more and 10 9 V / m or less.
- the applied voltage is 10 5 V / m or more, the generated charges are easily carried to the electrode efficiently, so that the photoelectric conversion efficiency is hardly lowered. Further, by setting it to 10 9 V / m or less, since the dark current is reduced, the S / N ratio is improved and the probability of occurrence of current leakage is reduced.
- a photoelectric conversion layer is a layer in which photoelectric conversion that absorbs incident light and generates charges occurs. This may be composed of a single photoelectric conversion material, but is preferably composed of a p-type semiconductor material and an n-type semiconductor material. At this time, each of the p-type semiconductor material and the n-type semiconductor material may be single or plural.
- the photoelectric conversion layer after the photoelectric conversion material absorbs light and forms excitons, electrons and holes are separated by an n-type semiconductor material and a p-type semiconductor material, respectively. The separated electrons and holes flow to the both poles through the conduction level and the valence level, respectively, and generate electric energy.
- the configuration of the photoelectric conversion layer is preferably a bulk heterojunction in which the above-described first compound and second compound are mixed in the same layer by a method such as co-evaporation.
- a bulk heterojunction is a structure in which two or more compounds are randomly mixed in one layer and the compounds are joined at the nano level. As a result, it is possible to efficiently separate the charge generated from one of the materials into holes and electrons.
- the absorption coefficient of the mixed film of the first compound and the second compound is preferably 5 ⁇ 10 4 cm ⁇ 1 or more, more preferably 8 ⁇ 10 4 in order to develop high light absorption. cm ⁇ 1 or more, more preferably 1 ⁇ 10 5 cm ⁇ 1 or more.
- the charge mobility of the first compound and the second compound is preferably 1 ⁇ 10 ⁇ 9 cm 2 / Vs or more, more preferably 1 ⁇ 10 ⁇ 8 cm 2 / Vs or more, Preferably, it is 1 ⁇ 10 ⁇ 7 cm 2 / Vs or more.
- the charge mobility is a mobility measured by a space charge limited current method (SCLC method). Funct. Mater, Vol. 16 (2006), page 701, and the like.
- the film thickness of the organic layer is preferably 20 nm or more and 200 nm or less.
- the photoelectric conversion material composing the photoelectric conversion layer may be a material previously known as a photoelectric conversion material in addition to the first compound and the second compound described above. Moreover, when the above-mentioned 1st compound and 2nd compound are used for organic layers other than a photoelectric converting layer, the material conventionally known as a photoelectric converting material can be used individually or as a mixture.
- the absorption wavelength of the photoelectric conversion layer is determined by the light absorption wavelength region of the photoelectric conversion material, it is preferable to use a material having light absorption characteristics corresponding to the color to be used.
- the photoelectric conversion layer is made of a material that absorbs light at 490 nm to 570 nm.
- the photoelectric conversion layer is composed of two or more kinds of materials, if a p-type semiconductor material and an n-type semiconductor material are included, among the carriers generated in the photoelectric conversion layer, holes easily flow through the p-type semiconductor material. Thus, since electrons easily flow through the n-type semiconductor material, holes and electrons can be efficiently separated.
- the photoelectric conversion layer is composed of materials having different energy levels of the p-type semiconductor material and the n-type semiconductor material, and the holes and electrons generated in the photoelectric conversion layer are further reduced.
- the photoelectric conversion layer is made of a material having high charge mobility so that it can move to the electrode side.
- the p-type semiconductor material may be any organic compound as long as it has a relatively small ionization potential, an electron donating property, and a hole transporting compound.
- p-type organic semiconductor materials include compounds having derivatives such as naphthalene, anthracene, phenanthrene, pyrene, chrysene, naphthacene, triphenylene, perylene, fluoranthene, fluorene, indene, derivatives thereof, cyclopentadiene derivatives, furan Derivatives, thiophene derivatives, pyrrole derivatives, benzofuran derivatives, benzothiophene derivatives, indole derivatives, pyrazoline derivatives, dibenzofuran derivatives, dibenzothiophene derivatives, carbazole derivatives, indolocarbazole derivatives, N, N'-dinaphthyl-N, N'-diphenyl- Aromatic amine derivatives such as 4,4′-
- polystyrene resin examples include, but are not limited to, polyphenylene vinylene derivatives, polyparaphenylene derivatives, polyfluorene derivatives, polyvinylcarbazole derivatives, and polythiophene derivatives.
- the n-type semiconductor material may be any material as long as it has a high electron affinity and is an electron transporting compound.
- n-type semiconductor materials include condensed polycyclic aromatic derivatives such as naphthalene, anthracene, naphthacene, styryl aromatic ring derivatives represented by 4,4′-bis (diphenylethenyl) biphenyl, tetraphenylbutadiene derivatives, coumarins Derivative, oxadiazole derivative, pyrrolopyridine derivative, perinone derivative, pyrrolopyrrole derivative, thiadiazolopyridine derivative, aromatic acetylene derivative, aldazine derivative, pyromethene derivative, diketopyrrolo [3,4-c] pyrrole derivative, imidazole, thiazole, Azole derivatives such as thiadiazole, oxazole, oxadiazole, triazole and metal complexes thereof, quinone derivatives
- organic compounds having a nitro group, cyano group, halogen or trifluoromethyl group in the molecule include fullerene derivatives.
- the electron-accepting nitrogen represents a nitrogen atom that forms a multiple bond with an adjacent atom. Since the nitrogen atom has a high electronegativity, the multiple bond has an electron accepting property. Therefore, an aromatic heterocyclic ring containing electron-accepting nitrogen has high electron affinity and is preferable as an n-type semiconductor material.
- heteroaryl ring containing an electron-accepting nitrogen examples include, for example, a pyridine ring, pyrazine ring, pyrimidine ring, quinoline ring, quinoxaline ring, naphthyridine ring, pyrimidopyrimidine ring, benzoquinoline ring, phenanthroline ring, imidazole ring, oxazole ring, Examples thereof include an oxadiazole ring, a triazole ring, a thiazole ring, a thiadiazole ring, a benzoxazole ring, a benzothiazole ring, a benzimidazole ring, and a phenanthrimidazole ring.
- Examples of these compounds having a heteroaryl ring structure include benzimidazole derivatives, benzoxazole derivatives, benzthiazole derivatives, oxadiazole derivatives, thiadiazole derivatives, triazole derivatives, pyrazine derivatives, phenanthroline derivatives, quinoxaline derivatives, quinoline derivatives, benzoins.
- Preferred compounds include quinoline derivatives, oligopyridine derivatives such as bipyridine and terpyridine, quinoxaline derivatives and naphthyridine derivatives.
- imidazole derivatives such as tris (N-phenylbenzimidazol-2-yl) benzene, oxadiazole derivatives such as 1,3-bis [(4-tert-butylphenyl) 1,3,4-oxadiazolyl] phenylene, Triazole derivatives such as N-naphthyl-2,5-diphenyl-1,3,4-triazole, phenanthroline derivatives such as bathocuproine and 1,3-bis (1,10-phenanthroline-9-yl) benzene, 2,2 ′
- a benzoquinoline derivative such as bis (benzo [h] quinolin-2-yl) -9,9′-spirobifluorene, 2,5-bis (6 ′-(2 ′, 2 ′′ -bipyridyl))-1, Bipyridine derivatives such as 1-dimethyl-3,4-diphenylsilole, 1,3-bis (4 ′-(2,2 )
- the above-mentioned material group can be used, but is not particularly limited.
- the charge blocking layer is a layer used to efficiently and stably take out electrons and holes photoelectrically converted in the photoelectric conversion layer from the electrode, and an electron blocking layer that blocks electrons and a hole that blocks holes. And a blocking layer. These may be comprised from the inorganic substance and may be comprised from the organic compound. Furthermore, you may consist of a mixed layer of an inorganic substance and an organic compound.
- the hole blocking layer is a layer for preventing holes generated in the photoelectric conversion layer from flowing to the anode side and recombining with electrons. Depending on the type of material constituting each layer, this layer may be By inserting, recombination of holes and electrons is suppressed, and the photoelectric conversion efficiency is improved. Therefore, the hole blocking material preferably has a HOMO level lower in energy than the photoelectric conversion material. A compound that can efficiently block the movement of holes from the photoelectric conversion layer is preferable.
- quinolinol derivative metal complexes represented by 8-hydroxyquinoline aluminum, tropolone metal complexes, flavonol metal complexes, perylene derivatives, perinone derivatives, Examples include naphthalene derivatives, coumarin derivatives, oxadiazole derivatives, aldazine derivatives, bisstyryl derivatives, pyrazine derivatives, oligopyridine derivatives such as bipyridine and terpyridine, phenanthroline derivatives, quinoline derivatives, and aromatic phosphorus oxide compounds.
- These hole blocking materials are used alone, but may be used by being laminated or mixed with different hole blocking materials.
- the electron blocking layer is a layer for blocking electrons generated in the photoelectric conversion layer from flowing to the cathode side and recombining with holes. Depending on the type of material constituting each layer, this layer may be inserted. By doing so, recombination of holes and electrons is suppressed, and the photoelectric conversion efficiency is improved. Therefore, the electron blocking material preferably has an LUMO level higher in energy than the photoelectric conversion material. A compound that can efficiently block the movement of electrons from the photoelectric conversion layer is preferable.
- the above hole-blocking layer and electron-blocking layer may be used alone or in combination of two or more materials, or polyvinyl chloride, polycarbonate, polystyrene, poly (N-vinylcarbazole), polymethyl methacrylate as a polymer binder.
- Solvent soluble resins such as polybutyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, hydrocarbon resin, ketone resin, phenoxy resin, polysulfone, polyamide, ethyl cellulose, vinyl acetate, ABS resin, polyurethane resin, phenol resin, xylene
- the resin, petroleum resin, urea resin, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin, curable resin such as silicone resin, and the like can also be used by being dispersed.
- the method for forming the organic layer is not particularly limited, such as resistance heating vapor deposition, electron beam vapor deposition, sputtering, molecular lamination method, and coating method, but resistance heating vapor deposition and electron beam vapor deposition are usually preferred in terms of characteristics.
- An image sensor is a semiconductor element that converts an optical image into an electrical signal.
- an image sensor includes the photoelectric conversion element that converts light into electric energy and a circuit that reads the electric energy into an electric signal.
- a plurality of photoelectric conversion elements can be arranged in a one-dimensional straight line or a two-dimensional plane.
- a monocolor image sensor it may be composed of one type of photoelectric conversion element, but in the case of a color image sensor, it is composed of two or more types of photoelectric conversion elements, for example, photoelectric conversion that detects red light.
- the photoelectric conversion elements of the respective colors have a stacked structure, that is, may be stacked in one pixel, or may be configured in a matrix structure side by side.
- a photoelectric conversion element 32 that detects green light, a photoelectric conversion element 33 that detects blue light, and a red light are detected.
- a three-layer structure in which the photoelectric conversion elements 31 are sequentially stacked may be used.
- a photoelectric conversion element 32 for detecting green light is arranged on the entire upper surface, and the photoelectric conversion element 31 for detecting red light and the blue light are detected.
- the photoelectric conversion element 33 to be formed may have a two-layer structure formed in a matrix structure. In this structure, the photoelectric conversion element 32 that detects green light is arranged in a layer closest to the incident light 34.
- the order of stacking the colors is not limited to this, and may be different from that shown in FIG. 5, but the uppermost photoelectric conversion element absorbs a specific color and transmits long-wavelength light and short-wavelength light other than the specific color. From the viewpoint of having a function as a color filter, a configuration in which a green photoelectric conversion element is arranged in the uppermost layer is preferable. When the color selectivity of the blue photoelectric conversion element is excellent, the blue photoelectric conversion element may be arranged in the uppermost layer from the viewpoint of easy detection of a short wavelength.
- a matrix structure In the case of a matrix structure, it can be selected from an array such as a Bayer array, a honeycomb array, a stripe array, or a delta array.
- an organic photoelectric conversion material is used for the photoelectric conversion element that detects green light, and the photoelectric conversion element that detects red light and the photoelectric conversion element that detects blue light are conventionally used inorganic photoelectric conversion materials. Or organic photoelectric conversion materials may be used in appropriate combination.
- the photoelectric conversion element of this invention can be utilized for a solar cell.
- a solar cell is an energy conversion element that absorbs sunlight energy and converts it directly into electricity.
- the principle is the same as that of an image sensor in that it absorbs light and generates electrical energy, the image sensor usually takes out the electric charge generated in the photoelectric conversion layer by applying an electric field from the outside.
- the solar cell is different in that the photoelectric conversion element itself generates a photovoltaic force, and the charge generated in the photoelectric conversion layer is taken out to the outside.
- the photoelectric conversion element of the present invention contains a compound that absorbs light at a wavelength of 400 to 700 nm, it is mainly suitable for converting light in the visible region into electric energy. In order to improve the conversion efficiency of the solar cell, it is preferable to absorb light in a wide wavelength range as much as possible. Therefore, in the second compound having a particularly high light absorption coefficient, light absorption is performed in all regions having a wavelength of 400 to 700 nm. It is preferable to use a compound having properties. Further, even if the light absorption wavelength region is narrow in the photoelectric conversion device of the present invention, photoelectric conversion devices having different light absorption wavelength regions (for example, photoelectric conversion devices that absorb red, green, and blue light) are vertically stacked. A tandem solar cell may be manufactured.
- the photoelectric conversion element of this invention can be utilized for a monochromatic detection sensor.
- it can be suitably used when the photoelectric conversion element has color selectivity and color discrimination and has a high light absorption coefficient.
- the present invention can be applied to a remote controller such as a television or an electric appliance, a light receiving element of a compact disc player, an illuminance sensor, a fluorescent probe sensor, a CCD, a photo register, etc.
- the photoelectric conversion element of this invention can be utilized for a flexible sensor.
- a photoelectric conversion element using an organic compound has lightness and flexibility not found in a photoelectric conversion element using an existing inorganic semiconductor. Taking advantage of this feature, it can be mounted on a curved structure or for imaging of the surface of a living body. Further, since it can be manufactured by a printing process, a sensor with a large area can be manufactured.
- the absorption spectrum was measured using a U-3200 spectrophotometer (manufactured by Hitachi, Ltd.) by vapor deposition on a quartz substrate with a film thickness of 50 nm.
- the absorption coefficient was calculated by Lambert-Beer Law.
- the spectral sensitivity characteristics (external quantum efficiency and maximum sensitivity wavelength) of the photoelectric conversion element were measured using an SM-250 type spectral sensitivity measuring device (manufactured by Spectrometer Co., Ltd.).
- Synthesis example 1 Synthesis Method of Compound [10] A mixed solution of phenylacetylene (10.0 g) and dehydrated tetrahydrofuran (200 ml) was stirred at 0 ° C. under a nitrogen stream. N-Butyllithium (1.6M hexane solution, 62 ml) was added dropwise to the mixed solution, and the mixture was stirred at 0 ° C. for 2 hours. Thereafter, a mixed solution of phenylacetaldehyde (6.0 g) and dehydrated tetrahydrofuran (20 ml) was added dropwise, and the mixture was returned to room temperature and stirred for 4 hours.
- N-Butyllithium 1.6M hexane solution, 62 ml
- the obtained solution was dried over magnesium sulfate, and after filtration, the solvent was distilled off.
- the obtained solid was dissolved in a small amount of dichloromethane, methanol was added, and the mixture was precipitated and filtered.
- the obtained solid was vacuum-dried to obtain 2.8 g of a yellow powder.
- the light absorption property of the compound [10] was as follows. Maximum absorption wavelength: 504 nm (thin film: 50 nm) Half width at maximum absorption wavelength: 23 nm Absorption coefficient at maximum absorption wavelength: 4.72 ⁇ 10 4 cm ⁇ 1 .
- Synthesis example 2 Synthesis Method of Compound [43] A mixed solution of 2-bromoacetophenone (35.0 g), phenol (18.2 g), potassium carbonate (26.7 g), and acetone (700 ml) was refluxed for 5 hours under a nitrogen stream. The reaction solution was returned to room temperature, evaporated to remove the solvent, and extracted with toluene. The resulting solution was dried over magnesium sulfate and then evaporated to remove the solvent. The obtained solid was recrystallized with methanol to obtain 23.0 g of a white powder.
- Synthesis example 3 Synthesis Method of Compound [108] Mixing of 1-bromomethyl-2-dibromomethylnaphthalene (10.0 g), 1,4-naphthoquinone (5.2 g), sodium iodide (25.5 g), dehydrated dimethylformamide (85 ml) The solution was stirred at 70 ° C. for 6 hours under a nitrogen stream. The reaction solution was returned to room temperature and then filtered. The obtained solid was washed with pure water and methanol and then filtered. The obtained solid was vacuum-dried to obtain 4.32 g of a yellow powder.
- Synthesis example 4 Synthesis Method of Compound [7] Under an argon atmosphere, 300 mL of 3N hydrochloric acid was added to 24.5 g of 2,4-diphenylamine, heated to 60 ° C. in an oil bath, stirred for 4 hours, and then hydrochloride (white suspension) I made it. The white suspension was cooled to 5 ° C. or lower with a salt-ice bath, and 60 mL of an aqueous solution containing 8.27 g of sodium nitrite was added dropwise over 30 minutes with stirring. At this time, the liquid temperature was not allowed to exceed 10 ° C. The resulting reddish brown solution was further stirred at 5 ° C. for 1 hour to prepare a diazonium salt solution.
- the 2 L beaker was shielded from light with aluminum foil, 1 L of distilled water was added, and deaerated by flowing an argon stream. The reaction solution was added to this and stirred for 30 minutes. The precipitated yellow powder was filtered off, put into 1 L of distilled water again, and stirred and washed. It was filtered, washed thoroughly with methanol and then vacuum dried. This was heated and washed with 250 mL of acetone deaerated by blowing argon, filtered and vacuum dried to obtain 12.70 g (yield 92.7%) of the target compound [7] orange-yellow powder. .
- the optical properties of the compound [7] were as follows. Maximum absorption wavelength: 506 nm (thin film: 50 nm) Half width at maximum absorption wavelength: 23 nm Absorption coefficient at maximum absorption wavelength: 4.65 ⁇ 10 4 cm ⁇ 1 .
- Example 1 A photoelectric conversion element using the compound [10] was produced as follows.
- the obtained substrate was ultrasonically washed with acetone and “Semicoclean (registered trademark) 56” (manufactured by Furuuchi Chemical Co., Ltd.) for 15 minutes, respectively, and then washed with ultrapure water. Subsequently, it was ultrasonically cleaned with isopropyl alcohol for 15 minutes and then immersed in hot methanol for 15 minutes and dried.
- “Semicoclean (registered trademark) 56” manufactured by Furuuchi Chemical Co., Ltd.
- This substrate was subjected to UV-ozone treatment for 1 hour immediately before producing the photoelectric conversion element, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus became 5 ⁇ 10 ⁇ 5 Pa or less.
- Molybdenum oxide was deposited to 30 nm as an electron blocking layer by a resistance heating method.
- compound [10] which is a p-type semiconductor material
- compound A-1 which is an n-type semiconductor material
- 60 nm of aluminum was vapor-deposited to make a cathode, and a 2 ⁇ 2 mm square photoelectric conversion element was produced.
- the film thickness referred to here is a crystal oscillation type film thickness monitor display value.
- a quartz substrate was placed in the same chamber simultaneously with the deposition of the photoelectric conversion layer to produce a 70 nm thin film.
- the spectral sensitivity characteristics when a bias voltage (-3V) was applied to the photoelectric conversion element were as follows.
- the photoelectric conversion efficiency is evaluated by the external quantum efficiency at the maximum sensitivity.
- Examples 2 to 9 A photoelectric conversion element was produced in the same manner as in Example 1 except that the types of the p-type semiconductor material and the n-type semiconductor material and the deposition rate ratio were as shown in Table 1. Table 1 shows the light absorption characteristics and spectral sensitivity characteristics.
- Examples 10-30 Instead of depositing 30 nm of molybdenum oxide as an electron blocking layer, PEDOT / PSS (CleviosTM PVP AI4083) was applied to 30 nm, and the types of p-type semiconductor material, n-type semiconductor material, and deposition rate ratio are as shown in Table 2.
- a photoelectric conversion element was produced in the same manner as in Example 1 except that. Table 2 shows the light absorption characteristics and spectral sensitivity characteristics.
- Comparative Examples 1-7 A photoelectric conversion element was produced in the same manner as in Example 1 except that only one of a p-type semiconductor material and an n-type semiconductor material was used for the photoelectric conversion layer.
- Table 3 shows the light absorption characteristics and spectral sensitivity characteristics.
- Comparative Example 8 A photoelectric conversion element was produced in the same manner as in Example 1 except that Compound A-4 was used as the n-type semiconductor material. Table 3 shows the light absorption characteristics and spectral sensitivity characteristics. Comparative Examples 9 and 10 A photoelectric conversion element was produced in the same manner as in Comparative Example 7 except that the p-type semiconductor material was changed as shown in Table 3. Table 3 shows the light absorption characteristics and spectral sensitivity characteristics.
- the photoelectric conversion element of the present invention can be applied to fields such as image sensors and solar cells. Specifically, it can be used in fields such as image sensors mounted on mobile phones, smartphones, tablet computers, digital still cameras, and sensing devices such as photovoltaic generators and visible light sensors.
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Abstract
Description
本発明の光電変換素子は、第一電極と第二電極の間に少なくとも一層の有機層が存在する光電変換素子であって、前記有機層に下記一般式(1)で表される第一の化合物と、波長400~700nmにおける吸収係数の極大値が5×104cm-1以上である第二の化合物とを含有するものである。
本発明における一般式(1)で表される第一の化合物について詳細を説明する。
本発明における、波長400~700nmにおける吸収係数の極大値が5×104cm-1以上である第二の化合物について説明する。なお、波長400~700nmにおいて2つ以上の吸収係数の極大値が存在する場合は、それらのうち最大の吸収係数の極大値で判断する。
本発明の光電変換素子において、陰極と陽極は光電変換素子の中で作られた電子及び正孔を流し、十分に電流を流せるための役割を有するものであり、光を入射させるために少なくとも一方は透明または半透明であることが好ましい。通常、基板上に形成される陰極を透明電極とする。
光電変換層とは入射光を吸収して電荷を発生する光電変換が生じる層である。これは単独の光電変換材料で構成されても良いが、p型半導体材料とn型半導体材料とで構成されることが好ましい。この際、p型半導体材料とn型半導体材料はそれぞれ単独でも複数でもよい。光電変換層では光電変換材料が光を吸収し、励起子を形成した後、電子と正孔がそれぞれn型半導体材料とp型半導体材料により、分離される。このように分離された電子と正孔はそれぞれ伝導準位と価電子準位を通して両極まで流され、電気エネルギーを発生させる。
電荷阻止層とは、光電変換層で光電変換された電子および正孔を効率よくかつ安定に電極から取り出すために用いられる層であり、電子を阻止する電子阻止層と正孔を阻止する正孔阻止層とが挙げられる。これらは無機物から構成されても良いし、有機化合物から構成されても良い。さらに、無機物と有機化合物の混合層からなってもよい。
本発明の光電変換素子はイメージセンサに好適に利用できる。イメージセンサは光学的な映像を電気的な信号に変換する半導体素子である。一般的にイメージセンサは光を電気エネルギーに変換する前述の光電変換素子と電気エネルギーを電気信号に読み出す回路で構成される。イメージセンサの用途によって、複数の光電変換素子を一次元直線または二次元平面に配列することができる。また、モノカラーのイメージセンサの場合は1種の光電変換素子で構成されてもよいが、カラーイメージセンサの場合は、2種以上の光電変換素子で構成され、例えば赤色光を検出する光電変換素子、緑色光を検出する光電変換素子、および青色光を検出する光電変換素子で構成される。各色の光電変換素子は積層構造を有する、すなわち一つの画素に積層されていてもよいし、横に並んでマトリクス構造で構成されてもよい。
本発明の光電変換素子は太陽電池に利用できる。太陽電池は、太陽光のエネルギーを吸収して直接電気に変えるエネルギー変換素子である。光を吸収して電気エネルギーを発生させる点ではイメージセンサと原理が共通しているが、イメージセンサは通常外部から電界を印加することにより光電変換層で発生した電荷を取り出しやすくするのに対し、太陽電池は光電変換素子自体が光起電力を発生させ、光電変換層で発生した電荷が外部に取り出されるところが異なる。
本発明の光電変換素子は、単色検知センサに利用できる。特に光電変換素子が色選択性・色識別性を有し、高い光吸収係数を有する場合に好適に利用できる。例えば、テレビや電化製品などのリモコン、コンパクトディスクプレイヤーの受光素子、照度センサ、蛍光プローブセンサ、CCD、フォトレジスタなどに適用できるが、用途はこれに限定されるものではない。
本発明の光電変換素子は、フレキシブルセンサに利用できる。有機化合物を用いた光電変換素子は、既存の無機半導体を用いた光電変換素子には無い軽量さと柔軟性を有している。この特徴を生かし、曲面構造物に実装したり、生体表面の撮像用に実装することが可能である。また、印刷プロセスで作製することが可能であることから、大面積のセンサを作製が可能である。
化合物[10]の合成方法
フェニルアセチレン(10.0g)、脱水テトラヒドロフラン(200ml)の混合溶液を窒素気流下、0℃で攪拌した。この混合溶液にn-ブチルリチウム(1.6Mヘキサン溶液、62ml)を滴下した後、0℃で2時間攪拌した。その後、フェニルアセトアルデヒド(6.0g)、脱水テトラヒドロフラン(20ml)の混合溶液を滴下した後、室温に戻して4時間攪拌した。反応溶液に純水100mlを加えた後、酢酸エチルで抽出した。得られた溶液を硫酸マグネシウムで乾燥し、ろ過後溶媒を留去した。得られた液体をシリカゲルカラムクロマトグラフィーにより精製し、エバポレートして黄色液体9.0gを得た。
1H-NMR(CDCl3(d=ppm)):6.70-7.74(m,26H),8.04-9.09(t,4H),8.19(s,2H)。
最大吸収波長:504nm(薄膜:50nm)
最大吸収波長における半値幅:23nm
最大吸収波長における吸収係数:4.72×104cm-1。
化合物[43]の合成方法
2-ブロモアセトフェノン(35.0g)、フェノール(18.2g)、炭酸カリウム(26.7g)、アセトン(700ml)の混合溶液を窒素気流下、5時間還流した。反応溶液を室温に戻して、エバポレートして溶媒を除去した後、トルエンで抽出した。得た溶液を硫酸マグネシウムで乾燥した後、エバポレートして溶媒を除去した。得られた固体をメタンールで再結晶して白色粉末23.0gを得た。
1H-NMR(CDCl3(d=ppm)):7.06-8.29(m,26H), 8.50(s,2H)
また、化合物[43]の光吸収特性は以下のようであった。
最大吸収波長:512nm(薄膜:50nm)
最大吸収波長における半値幅:103nm
最大吸収波長における吸収係数:2.75×104cm-1。
化合物[108]の合成方法
1-ブロモメチル-2-ジブロモメチルナフタレン(10.0g)、1,4-ナフトキノン(5.2g)、ヨウ化ナトリウム(25.5g)、脱水ジメチルホルムアミド(85ml)の混合溶液を窒素気流下、70℃で6時間攪拌した。反応溶液を室温に戻した後、ろ過した。得られた固体を純水とメタノールで洗浄した後ろ過した。得られた固体を真空乾燥し、黄色粉末4.32gを得た。
1H-NMR(CDCl3(d=ppm)):7.08-7.13(m,7H),7.25-7.51(m,13H),7.69-7.75(m,3H),7.89-7.96(m,2H),8.04-8.08(m,2H),8.34-8.35(m,2H),9.19-9.22(d,1H,d=7.56Hz)
また、化合物[108]の光吸収特性は以下のようであった。
最大吸収波長:492nm(薄膜:50nm)
最大吸収波長における半値幅: 吸収スペクトルの明確なピークが無く、算出不可
最大吸収波長における吸収係数: 3.00×104cm-1。
化合物[7]の合成方法
アルゴン雰囲気下、2,4-ジフェニルアミン24.5gに3N塩酸水300mLを加え、オイルバスにて60℃に加熱し、4時間撹拌して塩酸塩(白色懸濁液)にした。この白色懸濁液を食塩-氷バスにて5℃以下まで冷却し、撹拌下、亜硝酸ナトリウム8.27gを含む水溶液60mLを30分かけて滴下した。この際、液温が10℃を超えないようにした。生成した赤褐色溶液を5℃でさらに1時間撹拌し、ジアゾニウム塩溶液を調製した。ビーカーにヨウ化カリウム60gを含む水溶液180mLを調整し、撹拌下、調製したジアゾニウム塩溶液を30分かけて少しずつ添加した。窒素ガスの発生が収まるまで、さらに30分撹拌した後、塩化メチレン200mLを加えて生成物を溶解した。少量の亜硫酸水素ナトリウムを添加して副生した沃素を分解したのち、有機層を分離し、炭酸ナトリウム水、及び水で洗浄した後、硫酸マグネシウムで乾燥した。溶媒を減圧留去し、カラムクロマトで精製して、2,4-ジフェニルヨウ化ベンゼン29.4g(収率82.5%)を得た。
最大吸収波長:506nm(薄膜:50nm)
最大吸収波長における半値幅:23nm
最大吸収波長における吸収係数:4.65×104cm-1。
化合物[10]を用いた光電変換素子を次のように作製した。ITO透明導電膜を150nm堆積させたガラス基板(旭硝子(株)製、15Ω/□、電子ビーム蒸着品)を30×40mmに切断、エッチングを行った。得られた基板をアセトン、”セミコクリーン(登録商標)56”(フルウチ化学(株)製)で各々15分間超音波洗浄してから、超純水で洗浄した。続いて、イソプロピルアルコールで15分間超音波洗浄してから熱メタノールに15分間浸漬させて乾燥させた。この基板を、光電変換素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-5Pa以下になるまで排気した。抵抗加熱法によって、電子阻止層として酸化モリブデンを30nm蒸着した。次に、光電変換層としてp型半導体材料である化合物[10]とn型半導体材料である化合物A-1を蒸着速度比1:3で70nm共蒸着した。次に、アルミニウムを60nm蒸着して陰極とし、2×2mm角の光電変換素子を作製した。ここで言う膜厚は、水晶発振式膜厚モニター表示値である。
最大吸収波長:525nm
最大吸収波長における半値幅:143nm
最大吸収波長における吸収係数:9.88×104cm-1。
最大感度波長:540nm
最大感度波長における外部量子効率:50%
なお、本発明において、光電変換効率は、最大感度における外部量子効率により評価する。
p型半導体材料、n型半導体材料の種類、および蒸着速度比を表1に示すとおりにした以外は、実施例1と同様にして光電変換素子を作製した。光吸収特性および分光感度特性を表1に示す。
電子阻止層として酸化モリブデンを30nm蒸着するかわりに、PEDOT/PSS(CleviosTM P VP AI4083)を30nm塗布し、p型半導体材料、n型半導体材料の種類、および蒸着速度比を表2に示すとおりにした以外は、実施例1と同様にして光電変換素子を作製した。光吸収特性および分光感度特性を表2に示す。
p型半導体材料、n型半導体材料のいずれか1種類のみを光電変換層に用いた以外は、実施例1と同様にして光電変換素子を作製した。光吸収特性および分光感度特性を表3に示す。
n型半導体材料として化合物A-4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製した。光吸収特性および分光感度特性を表3に示す。
比較例9、10
p型半導体材料を表3に示すとおりにした以外は、比較例7と同様にして光電変換素子を作製した。光吸収特性および分光感度特性を表3に示す。
11 有機層
13 電子阻止層
15 光電変換層
17 正孔阻止層
20 第二電極
31 赤色光を検出する光電変換素子
32 緑色光を検出する光電変換素子
33 青色光を検出する光電変換素子
34 入射光
Claims (18)
- 第一電極と第二電極の間に少なくとも一層の有機層が存在する光電変換素子であって、前記有機層に下記一般式(1)で表される第一の化合物と、波長400~700nmにおける吸収係数の極大値が5×104cm-1以上である第二の化合物とを含有する光電変換素子。
但し、前記一般式(1)のR5およびR12は、下記一般式(2)または下記一般式(3)で表される基である。
- 前記一般式(1)のR5およびR12が一般式(2)で表され、前記一般式(2)のR15がアルキル基、アルコキシ基、アリール基またはヘテロアリール基である請求項1記載の光電変換素子。
- 前記一般式(1)のR5およびR12が一般式(3)で表され、前記一般式(3)のR20がアルキル基、アルコキシ基、アリール基またはヘテロアリール基である請求項1記載の光電変換素子。
- 前記一般式(1)のR5およびR12が一般式(3)で表され、前記一般式(3)のXが酸素原子である請求項1または3記載の光電変換素子。
- 前記第二の化合物が、チオフェン誘導体、ピレン誘導体およびペリレン誘導体の中から選ばれる誘導体である請求項1~4のいずれかに記載の光電変換素子。
- 前記第二の化合物が、下記一般式(4)で表される化合物である請求項5記載の光電変換素子。
- 前記第二の化合物が、下記一般式(6)で表される化合物である請求項5記載の光電変換素子。
- 前記有機層が光電変換層を含み、該光電変換層が前記第一の化合物および前記第二の化合物を含む請求項1~8のいずれかに記載の光電変換素子。
- 前記第一の化合物がp型半導体材料であり、前記第二の化合物がn型半導体材料である請求項1~9のいずれかに記載の光電変換素子。
- 前記第一の化合物と前記第二の化合物の電荷移動度が、いずれも1×10-9cm2/Vs以上である請求項1~10のいずれかに記載の光電変換素子。
- 前記有機層の膜厚が20nm以上200nm以下である請求項1~11のいずれかに記載の光電変換素子。
- 請求項1~12のいずれかに記載の光電変換素子を有するイメージセンサ。
- 2種類以上の光電変換素子で構成され、そのうちの少なくとも1種類の光電変換素子が請求項1~12のいずれかに記載の光電変換素子である請求項13記載のイメージセンサ。
- 前記2種類以上の光電変換素子が積層構造を有する請求項14記載のイメージセンサ。
- 請求項1~12のいずれかに記載の光電変換素子を有する太陽電池。
- 請求項1~12のいずれかに記載の光電変換素子を有する単色検知センサ。
- 請求項1~12のいずれかに記載の光電変換素子を有するフレキシブルセンサ。
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KR1020167034372A KR102325535B1 (ko) | 2014-08-20 | 2015-08-05 | 광전 변환 소자 및 그것을 이용한 이미지 센서, 태양 전지, 단색 검지 센서 및 플렉서블 센서 |
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JP2021093534A (ja) * | 2021-02-03 | 2021-06-17 | ソニーグループ株式会社 | 撮像素子、積層型撮像素子、撮像装置及び電子装置 |
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CN106575708A (zh) | 2017-04-19 |
JPWO2016027675A1 (ja) | 2017-06-01 |
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US20170141320A1 (en) | 2017-05-18 |
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