WO2018181744A1 - 太陽電池、及びその製造方法 - Google Patents
太陽電池、及びその製造方法 Download PDFInfo
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- WO2018181744A1 WO2018181744A1 PCT/JP2018/013318 JP2018013318W WO2018181744A1 WO 2018181744 A1 WO2018181744 A1 WO 2018181744A1 JP 2018013318 W JP2018013318 W JP 2018013318W WO 2018181744 A1 WO2018181744 A1 WO 2018181744A1
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- Prior art keywords
- layer
- organic
- halide
- perovskite
- solar cell
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- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
- H10K30/88—Passivation; Containers; Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/24—Lead compounds
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/50—Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/10—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising heterojunctions between organic semiconductors and inorganic semiconductors
- H10K30/15—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2
- H10K30/151—Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2 the wide bandgap semiconductor comprising titanium oxide, e.g. TiO2
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/50—Photovoltaic [PV] devices
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a solar cell in which a photoelectric conversion layer contains an organic-inorganic perovskite compound, and a method for manufacturing the solar cell.
- Such a solar cell generally includes a cathode and an anode, and a photoelectric conversion layer including an organic-inorganic perovskite compound disposed between the two electrodes.
- a photoelectric conversion layer including an organic-inorganic perovskite compound disposed between the two electrodes.
- an inorganic layer and a barrier layer having a predetermined water vapor transmission rate are provided on either the cathode or the anode. Those arranged in order are also known.
- the photoelectric conversion layer containing the organic / inorganic perovskite compound is significantly deteriorated by moisture, the moisture deterioration of the photoelectric conversion layer may not be sufficiently suppressed by the inorganic layer and the barrier layer provided on the electrode.
- a photoelectric conversion layer containing an organic / inorganic perovskite compound may be deteriorated due to moisture intrusion from the side surface.
- the present inventors have found that at least one selected from a metal halide (B1) and an organic metal halide (B2) or an organic halide (B2) on the outer peripheral side of the perovskite layer constituting the photoelectric conversion layer ( It has been found that the above problems can be solved by providing a side surface protective layer containing C), and the following invention has been completed. That is, the present invention provides the following [1] to [9].
- a perovskite layer At least one selected from the group consisting of a metal halide (B1) and an organic metal halide (B2) provided on the outer peripheral side of the perovskite layer so as to cover at least a part of the side surface of the perovskite layer. Or a side surface protective layer containing an organic halide (C).
- B1 metal halide
- B2 organic metal halide
- C organic halide
- [6] forming a first electrode; On the first electrode, at least one selected from the group consisting of a metal halide (B1) and an organic metal halide (B2) is attached, and an organic halide (C) is attached to thereby form a perovskite.
- a metal halide (B1) and an organic metal halide (B2) is attached, and an organic halide (C) is attached to thereby form a perovskite.
- the region to which at least one selected from the group consisting of the metal halide (B1) and the organic metal halide (B2) adheres overlaps the region to which the organic halide (C) adheres, and the outer periphery of the region
- the region that protrudes outside at least a part or adheres to the organic halide (C) is a region to which at least one selected from the group consisting of the metal halide (B1) and the organic metal halide (B2) adheres.
- the region to which at least one selected from the group consisting of the metal halide (B1) and the organic metal halide (B2) is attached extends from the outer periphery to the entire periphery of the region to which the organic halide (C) is attached.
- the region to which the organic halide (C) is attached extends from the outer periphery of the region to which at least one selected from the group consisting of the metal halide (B1) and the organic metal halide (B2) is attached to the entire periphery.
- the method for producing a solar cell according to [6] which protrudes.
- At least one selected from the group consisting of the metal halide (B1) and the organic metal halide (B2) is attached, and then the organic halide (C) is attached. 7] or the method for producing a solar cell according to [8].
- the present invention it is possible to provide a solar cell having high durability against deterioration due to moisture intrusion from the side surface of the photoelectric conversion layer.
- the solar cell of the present invention includes a first and second electrodes, one of which is a cathode and the other is an anode, a perovskite layer disposed between the first and second electrodes, and an outer peripheral side of the perovskite layer And a side surface protective layer provided to cover the side surface of the perovskite layer.
- the perovskite layer is a layer containing an organic / inorganic perovskite compound (A) and serves as a photoelectric conversion layer.
- the side surface protective layer is a layer containing at least one selected from the metal halide (B1) and the organic metal halide (B2) or the organic halide (C).
- the photoelectric conversion layer (perovskite layer) is prevented from being deteriorated due to moisture intrusion from the side surface.
- the organic / inorganic perovskite compound (A) may be omitted and simply referred to as “component (A)”. The same applies to other compounds.
- An organic inorganic perovskite compound (A) is a compound represented by the following general formula (1).
- RMX 3 (1) In the formula (1), R is an organic molecule, M is a metal atom, and X is a halogen atom.
- the photoelectric conversion efficiency of a solar cell can be made favorable by making the perovskite layer which is a photoelectric converting layer contain the organic inorganic perovskite compound (A) shown by General formula (1). Note that the solar cell using the organic / inorganic perovskite compound (A) for the photoelectric conversion layer is also referred to as an organic / inorganic hybrid solar cell.
- R is an organic molecule, and is preferably represented by C 1 N m H n (l, m, and n are all positive integers). Specifically, R represents, for example, methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, ethylmethylamine, methylpropylamine.
- Ion e.g., ammonium (CH 3 NH 3), phenethyl ammonium, etc.
- alkylamine and its ions are preferable, and primary alkylamines such as methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine and these ions are preferable, and methylamine, Ethylamine, propylamine and their ions are more preferred, and methylamine and its ions are even more preferred.
- the organic molecule represented by R may be used alone or in combination of two or more.
- M is a metal atom, for example, lead, tin, zinc, titanium, antimony, bismuth, nickel, iron, cobalt, silver, copper, gallium, germanium, magnesium, calcium, indium, aluminum , Manganese, chromium, molybdenum, europium and the like.
- metal atoms may be used alone or in combination of two or more.
- lead, tin, germanium, indium, antimony, and bismuth are preferable and lead is more preferable from the viewpoint of improving the photoelectric conversion efficiency of the solar cell.
- X is a halogen atom.
- X include chlorine, bromine and iodine. These halogen atoms may be used alone or in combination of two or more.
- An organic inorganic perovskite compound becomes soluble in an organic solvent by containing a halogen atom, and can be applied to an inexpensive printing method or the like.
- an iodine is more preferable. When iodine is used, the energy band gap of the organic-inorganic perovskite compound (A) is narrowed, and the photoelectric conversion efficiency is easily improved.
- the organic / inorganic perovskite compound (A) preferably has a cubic structure in which a metal atom is arranged at the body center, an organic molecule is arranged at each vertex, and a halogen atom is arranged at the face center.
- a metal atom is arranged at the body center
- an organic molecule is arranged at each vertex
- a halogen atom is arranged at the face center.
- the organic / inorganic perovskite compound (A) constituting the perovskite layer is a reaction product of at least one selected from the metal halide (B1) and the organic metal halide (B2) and the organic halide (C). Is preferred.
- the organic / inorganic perovskite compound (A) is a reaction product, at least one of the components (B1) and (B2) and the component (C) are attached to the same region, and these are reacted in the region.
- a perovskite layer can be formed.
- At least one of the components (B1) and (B2) is attached, but the region where the component (C) is not attached or the component (C) is attached, but at least one of the components (B1) and (B2) is attached.
- a side protective layer containing at least one of components (B1) and (B2) or component (C) can be formed in that region.
- Metal halide (B1) and organometallic halide (B2) At least one of the metal halide (B1) and the organometallic halide (B2) is one of the components that can constitute the side surface protective layer. Moreover, it reacts with the organic halide (C) to produce the organic / inorganic perovskite compound (A). In the present invention, it is possible to appropriately prevent moisture permeation into the perovskite layer by using at least one of the metal halide (B1) and the organometallic halide (B2) for the side surface protective layer. .
- the metal halide (B1) and the organic metal halide (B2) are also used as the raw material (precursor) of the organic inorganic perovskite compound (A) as described above, and these are used as the raw material of the perovskite layer. This facilitates formation of the side surface protection layer and the perovskite layer.
- the metal halide (B1) and the organometallic halide (B2) contained in the side surface protective layer are organic inorganic perovskite compounds contained in the perovskite layer. It is preferable that it is the same compound as what is used as a precursor of (A).
- the metal halide (B1) is not particularly limited as long as it can react with the organic halide (C) to produce the organic / inorganic perovskite compound (A), and is represented by the following general formula (2).
- a compound is preferred.
- MX k (2) (However, M and X are respectively synonymous with M and X in Formula (1).
- K is an integer of 1 to 3.)
- k is preferably 2.
- detailed description of M and X in the metal halide (B1) is the same as described above, and will be omitted.
- the metal halide (B1) include lead chloride (PbCl 2 ), lead bromide (PbBr 2 ), lead iodide (PbI 2 ), tin chloride (SnCl 2 ), tin bromide (SnBr 2 ). , Tin iodide (SnI 2 ), indium chloride (InCl), indium bromide (InBr), and indium iodide (InI).
- lead chloride, lead bromide, and lead iodide are more preferable, and lead iodide is more preferable.
- various monovalent metal halides such as a monovalent indium halide, what is necessary is just to mix and use various trivalent metal halides.
- the organometallic halide (B2) is a complex formed by coordinating a polar organic molecule to a metal halide.
- the organometallic halide (B2) comprises the above-described metal halide (B1) and a compound capable of forming a complex with the metal halide (B1) (hereinafter sometimes simply referred to as compound (B3)).
- the compound (B3) include sulfoxide compounds and amide compounds.
- the solvent used by mixing with the metal halide (B1) is also a compound (B3) capable of forming a complex with the metal halide (B1) depending on the type of the metal halide (B1). Sometimes you get.
- Examples of the sulfoxide compound include compounds represented by the general formula YS ( ⁇ O) —Y ′.
- Y and Y ′ represent an optionally substituted hydrocarbon group having 1 to 18 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, Peptyl group, octyl group, decyl group, dodecyl group, methylene group, phenyl group, naphthyl group, biphenyl group, methoxy group, ethoxy group, propoxy group, butoxy group and the like can be mentioned.
- a methyl group, an ethyl group, a propyl group, an n-butyl group, a t-butyl group, and a phenyl group are preferable, and a methyl group is particularly preferable.
- Y and Y ′ may be the same as or different from each other.
- the compound (B3) is preferably a sulfoxide compound, and more preferably dimethyl sulfoxide (DMSO).
- DMSO dimethyl sulfoxide
- generation method of an organometallic halide (B2) is not specifically limited, The method etc. which mix a metal halide (B1) and a compound (B3) are mentioned.
- the metal halide (B1) and the organic metal halide (B2) one kind selected from these may be used alone, or two or more kinds may be used in combination.
- Organic halide (C) is one of the components that can constitute the side surface protective layer.
- the organic halide (C) for the side surface protective layer, the moisture entering the perovskite layer is absorbed by the organic halide (C), so that it is difficult for the moisture to reach the perovskite layer.
- the organic halide (C) is also used as a raw material (precursor) of the organic / inorganic perovskite compound (A) as described above, and by using these as a raw material for the perovskite layer, Formation of a perovskite layer is facilitated.
- the organic halide (C) reacts with at least one of the metal halide (B1) and the organic metal halide (B2) to produce the organic inorganic perovskite compound (A).
- the organic halide (C) is preferably a compound represented by the following general formula (3). RX (3) (However, R and X are respectively synonymous with R and X in Formula (1).) The detailed description of R and X in the organic halide (C) is the same as described above, and will be omitted.
- the organic halide (C) is more preferably an alkyl ammonium halide, particularly preferably a primary alkyl ammonium halide.
- Specific examples of the organic halide (C) include the halide of the organic molecule represented by R described above.
- the perovskite layer may be composed of the organic / inorganic perovskite compound (A), but may contain other components in addition to the organic / inorganic perovskite compound (A) as long as the effects of the present invention are not impaired.
- the content of the organic / inorganic perovskite compound (A) is generally 50% by mass or more, preferably 70 to 100% by mass, and more preferably 80 to 100% by mass in the perovskite layer.
- Examples of components other than the organic / inorganic perovskite compound (A) contained in the perovskite layer include at least either an organic semiconductor or an inorganic semiconductor.
- the raw material unreacted material for example, (B1), (B2) and (C) component), etc.
- organic inorganic perovskite compound (A) when forming an organic inorganic perovskite compound (A) may be contained.
- the organic semiconductor include a compound having a thiophene skeleton such as poly (3-alkylthiophene).
- conductive polymers having a polyparaphenylene vinylene skeleton, a polyvinyl carbazole skeleton, a polyaniline skeleton, a polyacetylene skeleton, and the like can be given.
- compounds having a porphyrin skeleton such as a phthalocyanine skeleton, a naphthalocyanine skeleton, a pentacene skeleton, a benzoporphyrin skeleton, a spirobifluorene skeleton, etc.
- carbon-containing materials such as carbon nanotubes, graphene, and fullerene that may be surface-modified Can be mentioned.
- the inorganic semiconductor examples include titanium oxide, zinc oxide, indium oxide, tin oxide, gallium oxide, tin sulfide, indium sulfide, zinc sulfide, CuSCN, Cu 2 O, MoO 3 , V 2 O 5 , WO 3 , MoS 2, MoSe 2, Cu 2 S , and the like.
- the perovskite layer includes at least one of an organic semiconductor and an inorganic semiconductor
- it may be a composite film in which at least one of the organic semiconductor part and the inorganic semiconductor part and the organic / inorganic perovskite compound part are combined.
- at least one of the organic semiconductor and the inorganic semiconductor may be formed as an organic semiconductor layer or an inorganic semiconductor layer, may form a stacked structure with the perovskite layer, and may have a function of a photoelectric conversion layer together with the perovskite layer.
- these organic semiconductor layers or inorganic semiconductor layers may serve as an electron transport layer or a hole transport layer described later.
- the side protective layer contains a compound selected from the metal halide (B1) and the organometallic halide (B2)
- the side protective layer is within the range not impairing the effects of the present invention, and the metal halide (B1) and Components other than the organometallic halide (B2) may be included.
- the total content of the metal halide (B1) and the organic metal halide (B2) is generally 50% by mass or more, preferably 70 to 100% by mass, more preferably 80 to 100% by mass in the side surface protective layer. %.
- Examples of components other than the metal halide (B1) and the organic metal halide (B2) contained in the side surface protective layer include the above-described organic semiconductors and inorganic semiconductors.
- the side protective layer may contain components other than the organic halide (C) as long as the effects of the present invention are not impaired.
- components other than the organic halide (C) contained in the side surface protective layer include the organic semiconductors and inorganic semiconductors described above.
- the solar cell of the present invention includes first and second electrodes, a perovskite layer disposed between the first and second electrodes, and a side surface protective layer disposed on the outer peripheral side of the perovskite layer.
- a layer other than the first and second electrodes, the perovskite layer, and the side surface protective layer may be included as long as the effects of the present invention are not impaired.
- an electron transport layer may be provided between the cathode (first or second electrode) and the perovskite layer, or a hole transport layer may be provided between the anode (first or second electrode) and the perovskite layer. May be.
- the solar cell may be provided with a barrier layer, and moisture intrusion along the thickness direction may be protected by the barrier layer.
- the barrier layer may be provided on the side opposite to the side on which one or both of the first and second electrodes are provided.
- the barrier layer may be bonded to the first or second electrode via an adhesive layer, for example.
- an inorganic semiconductor layer, an organic semiconductor layer, or the like may be provided so as to be stacked on the perovskite layer.
- the solar cell preferably has a substrate, and a laminate having the first and second electrodes, the perovskite layer, the side surface protective layer, and other layers provided as necessary may be provided on the substrate. .
- FIG. 1 shows an embodiment of the solar cell of the present invention.
- a solar cell 10 according to an embodiment of the present invention includes a substrate 11, and further, on the substrate 11, a first electrode 12 serving as a cathode, an electron transport layer 13, The perovskite layer 14 and the side surface protective layer 15, the hole transport layer 16, the second electrode 17, the adhesive layer 18, and the barrier layer 19 are formed in this order.
- FIG. 2 is a schematic perspective view showing an embodiment of the structure of the side surface protective layer and the perovskite layer according to the present invention.
- the side surface protective layer 15 is provided on the outer peripheral side of the perovskite layer 14 so as to be continuous with the perovskite layer 14 and covers the side surface of the perovskite layer 14. Thereby, the side surface of the perovskite layer 14 is prevented from being exposed by the side surface protective layer 15, and moisture intrusion from the side surface is prevented.
- the side surface protective layer 15 provided on the outer peripheral side of the perovskite layer 14 is provided so as to surround the perovskite layer 14 over the entire periphery, as shown in FIG. In this case, the entire periphery of the side surface of the perovskite layer 14 is covered with the side surface protective layer 15, and it is possible to effectively prevent moisture from entering from the side surface.
- the side surface protective layer 15 may contain a compound selected from a metal halide (B1) and an organic metal halide (B2), or may contain an organic halide (C).
- the side surface protective layer 15 includes a compound selected from the metal halide (B1) and the organometallic halide (B2), it is possible to prevent moisture from entering from the side surface more effectively.
- the side surface protective layer 15 contains an organic halide (C)
- the color of the side surface protective layer to be formed is white, so that there is an advantage that the design property is high.
- the side protective layer contains the metal halide (B1) and the organometallic halide (B2), for example, when the lead atom is contained, the side protective layer turns yellow, so that the viewpoint from the viewpoint of appearance and appearance Is not preferable.
- the side surface of the perovskite layer 14 does not need to be covered with the side surface protective layer 15 over the entire circumference, and only a part of the side surface may be covered with the side surface protective layer 15. Specifically, the side surface of the perovskite layer 14 may be covered by 20% or more of the entire periphery, preferably 45% or more of the entire periphery, and 70% or more of the entire periphery. Is more preferable, but 100% of the entire circumference, that is, it is most preferable that the side surface is covered over the entire circumference.
- the perovskite layer 14 has a quadrangular shape in plan view, it is most preferable that all four sides are covered with the side surface protective layer 15 as shown in FIG. Only two sides or only three sides may be covered with the side protective layer 15.
- the shape of the perovskite layer 14 in plan view is not limited to a quadrangle, and may be a polygonal shape other than a quadrangle such as a triangle, pentagon, or hexagon, or a shape having a curve such as a circle or an ellipse.
- the width W of the side surface protective layer 15 is preferably 0.5 mm or more from the outer periphery to the outer side of the perovskite layer 14.
- the width W means the shortest distance from the outer periphery of the perovskite layer 14 to the outer periphery of the side surface protective layer 15.
- the side protection layer 15 can appropriately protect the perovskite layer 14.
- the width W is more preferably 0.9 mm or more, and still more preferably 1.8 mm or more.
- the width W is not particularly limited, but is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less from the viewpoint of not reducing the effective photoelectric conversion area.
- the side protective layer 15 is preferably formed on the same surface as the perovskite layer 14.
- the phrase “formed on the same surface” means that the perovskite layer 14 and the side surface protective layer 15 are formed on the same surface of the same layer.
- the perovskite layer 14 is formed on the electron transport layer 13 as shown in FIG. 1, it means that the side surface protective layer 15 is also formed on the electron transport layer 13.
- the electron transport layer 13 is omitted and the perovskite layer is formed directly on the first electrode 12, this means that the side surface protective layer 15 is also formed directly on the first electrode 12.
- the side surface protective layer 15 and the perovskite layer 14 are formed on the same surface, the side surface of the perovskite layer 14 is easily protected by the side surface protective layer 15.
- the side surface protective layer 15 is simultaneously formed by the process for forming the perovskite layer 14 in the manufacturing method described later, it is easily formed by such a manufacturing method.
- the side surface protection layer 15 covers the side surface of the perovskite layer 14, the side surface protection layer 15 and the perovskite layer 14 are not necessarily formed on the same surface.
- the perovskite layer 14 is formed on the surface of the electron transport layer 13.
- the side surface protection layer 15 may be formed on the surface of the first electrode 12 or the substrate 11.
- the thickness of the side protective layer and the perovskite layer is preferably 5 to 5000 nm. When the thickness is 5 nm or more, light can be sufficiently absorbed by the perovskite layer, and the photoelectric conversion efficiency is increased. If the thickness is 5000 nm or less, generation of a region where charge separation cannot be performed in the perovskite layer can be suppressed, leading to improvement in photoelectric conversion efficiency.
- the thickness of the perovskite layer and the side surface protective layer is more preferably 10 to 1000 nm, and still more preferably 20 to 500 nm.
- the side protective layer and the perovskite layer may have the same thickness or different thicknesses. However, the thickness of the perovskite layer can be protected by the side surface protection layer, and the thicknesses of the layers should be the same or different even if they are different.
- One of the first and second electrodes used in the solar cell of the present invention is a cathode and the other is an anode.
- the material constituting the cathode include FTO (fluorine-doped tin oxide), sodium, sodium-potassium alloy, lithium, magnesium, aluminum, magnesium-silver mixture, magnesium-indium mixture, aluminum-lithium alloy, Al / Al 2 Examples thereof include an O 3 mixture and an Al / LiF mixture. These materials may be used alone or in combination of two or more.
- the thickness of the cathode is not particularly limited, and is, for example, 1 nm to 10 ⁇ m, preferably 10 to 5000 nm.
- Examples of materials constituting the anode include metals such as gold and silver, CuI, ITO (indium tin oxide), SnO 2 , AZO (aluminum zinc oxide), IZO (indium zinc oxide), and GZO (gallium zinc). Conductive transparent materials such as oxides) and conductive transparent polymers. These materials may be used alone or in combination of two or more.
- the thickness of the anode is not particularly limited, and is, for example, 1 nm to 10 ⁇ m, preferably 10 to 2000 nm.
- the first and second electrodes may be formed in layers or may be appropriately patterned.
- the electron transport layer may be disposed between the cathode and the photoelectric conversion layer (perovskite layer) in the solar cell of the present invention.
- the material of the electron transport layer is not particularly limited, and for example, an N-type conductive polymer, an N-type low molecular organic semiconductor, an N-type metal oxide, an N-type metal sulfide, an alkali metal halide, an alkali metal, a surface activity Agents and the like.
- examples include compounds, fluoro group-containing phthalocyanines, titanium oxide, zinc oxide, indium oxide, tin oxide, gallium oxide, tin sulfide, indium sulfide, and zinc sulfide.
- the electron transport layer may consist of only a non-porous thin film electron transport layer, but preferably includes a porous electron transport layer, on the non-porous thin film electron transport layer, More preferably, a porous electron transport layer is formed.
- a perovskite layer is preferably formed on the porous electron transport layer.
- the electron transport layer may contain an additive as appropriate.
- the thickness of the electron transport layer is preferably 1 to 2000 nm. If the thickness is 1 nm or more, holes can be blocked. Moreover, if thickness is 2000 nm or less, the resistance in the case of electron transport will become low, and a photoelectric conversion efficiency will become high.
- the thickness of the electron transport layer is more preferably 3 to 1000 nm, still more preferably 5 to 800 nm.
- a hole transport layer may be arrange
- the material of the hole transport layer is not particularly limited, and examples thereof include a P-type conductive polymer, a P-type low molecular organic semiconductor, a P-type metal oxide, a P-type metal sulfide, a surfactant, and the like. Examples thereof include a compound having a thiophene skeleton such as a polystyrenesulfonic acid adduct of polyethylene dioxythiophene and a carboxyl group-containing polythiophene.
- a phthalocyanine skeleton such as phthalocyanine
- a porphyrin skeleton such as porphyrin
- 2,2 ′, 7,7′-tetrakis N, N-di-p-methoxyphenylamine
- -9,9′-spirobifluorene Spiro- And compounds having a spirobifluorene skeleton such as OMeTAD.
- the hole transport layer may contain additives as appropriate.
- the thickness of the hole transport layer is preferably 1 to 2000 nm. If the thickness is 1 nm or more, electrons can be blocked. Moreover, if thickness is 2000 nm or less, the resistance in the case of hole transport will become small, and a photoelectric conversion efficiency will become high.
- the thickness is more preferably 3 to 1000 nm, still more preferably 5 to 800 nm.
- a barrier layer may be provided on the side opposite to the side on which one or both of the first and second electrodes are provided.
- a barrier layer it is preferable that a first electrode, a perovskite layer, a side surface protective layer, a second electrode, and a barrier layer are provided in this order on a substrate.
- the barrier layer is a layer for preventing moisture intrusion along the thickness direction of the solar cell.
- the barrier layer can protect the solar cell from foreign matters and the like.
- money, silver, copper, iron, titanium, nickel may be sufficient, for example, glass, a ceramic substrate, a plastic substrate etc. may be sufficient.
- an inorganic layer such as a metal oxide, metal nitride, or metal oxynitride, or a resin formed of various resins such as polyethylene terephthalate, polyethylene naphthalate, polycycloolefin, polyisobutylene, and acrylic resin.
- a layer may be sufficient, and these laminated bodies may be sufficient.
- the thickness of the barrier layer is not particularly limited, but is preferably 10 nm to 200 ⁇ m, and more preferably 50 nm to 100 ⁇ m.
- an adhesive layer may be provided, and the barrier layer may be adhered to the first or second electrode via the adhesive layer. Examples of the adhesive layer include various adhesives such as a rubber adhesive, an acrylic adhesive, and a silicone adhesive. Moreover, it is preferable to use an adhesive with high barrier property as an adhesive used for an adhesive layer.
- the substrate used in the solar cell of the present invention is not particularly limited, and a transparent base material is suitable.
- a transparent glass substrate such as soda lime glass and non-alkali glass
- a ceramic substrate such as soda lime glass and non-alkali glass
- a transparent plastic substrate such as soda lime glass and non-alkali glass
- the method for producing a solar cell of the present invention includes, for example, the following steps (a) to (c). Step (a): forming a first electrode; Step (b): forming a perovskite layer and a side surface protective layer on the first electrode; Step (c): forming a second electrode on the perovskite layer
- the method for forming the first electrode in the step (a) is not particularly limited.
- the electrode may be formed on the substrate by a conventional method.
- an electron transport layer, an organic semiconductor layer, an inorganic semiconductor layer, or the like may be appropriately formed over the first electrode before forming the perovskite layer.
- a process (b) is performed after a process (a).
- the step (b1) of attaching at least one selected from the metal halide (B1) and the organic metal halide (B2) and the step (b2) of attaching the organic halide (C) are performed.
- At least a perovskite layer is formed.
- the perovskite layer is a layer containing an organic-inorganic perovskite compound (A). Either step (b1) or step (b2) may be performed first.
- the method for attaching at least one selected from the components (B1) and (B2) is not particularly limited, but the first method includes at least one of the components (B1) and (B2). What is necessary is just to apply by applying a coating liquid.
- the first coating liquid further contains a solvent, and the components (B1) and (B2) contained in the first coating liquid are preferably dissolved in the solvent.
- the solvent used in the first coating solution is not particularly limited as long as it can dissolve the components (B1) and (B2).
- N, N-dimethylformamide (DMF), ⁇ -butyllactone, 2 -Methoxyethanol, dimethyl sulfoxide (DMSO) or the like can be used.
- a solvent may be used individually by 1 type and may be used in mixture of 2 or more types. When two or more kinds are mixed, for example, even if one kind alone is a solvent having low solubility in the components (B1) and (B2), the solid content is within a range in which a required film thickness can be formed. Such a solvent may be used as long as the concentration can be adjusted.
- the first coating liquid may contain components other than the components (B1) and (B2) and the solvent, if necessary, and includes, for example, the above-described organic semiconductor, inorganic semiconductor, and the like. Also good.
- the first coating liquid may be dried by heating or the like as appropriate.
- the method for attaching the organic halide (C) in the step (b2) is not particularly limited, but may be performed by applying a second coating liquid containing the component (C).
- the second coating liquid further contains a solvent, and the component (C) is preferably dissolved in the solvent.
- the solvent used for preparing the second coating liquid is not limited as long as it can dissolve the component (C), and examples thereof include protic solvents such as isopropyl alcohol (IPA) and ethanol.
- a solvent may be used individually by 1 type and may be used in mixture of 2 or more types.
- solid content concentration can be adjusted in the range which can form the required film thickness, for example.
- the second coating liquid may contain a component other than the component (C) and the solvent, and may contain, for example, the above-described organic semiconductor and inorganic semiconductor.
- the second coating liquid may be dried by heating or the like as appropriate.
- the coating method of the first and second coating liquids is not particularly limited, and examples thereof include a die coating method, a spin coating method, and a casting method. A printing method such as a roll-to-roll method can also be employed.
- the components (B1) and (B2) and the component (C) may be directly attached on the first electrode, but a layer other than the electrode such as an electron transport layer is provided on the first electrode. If formed, it may be deposited on the layer.
- the component (C) is preferably attached to the region where the perovskite layer is formed.
- the component (C) is preferably attached to a region where the perovskite layer and the side surface protective layer are formed in the solar cell.
- at least one of the components (B1) and (B2) is preferably attached to the region where the perovskite layer is formed.
- the region to which at least one of the components (B1) and (B2) is used for the side surface protective layer is the region to which the component (C) is attached. It overlaps and protrudes outside at least a part of the outer periphery of the region.
- the region to which the component (C) adheres overlaps the region to which at least one of the components (B1) and (B2) adheres, and the outer periphery of the region It will protrude beyond at least a part.
- the organic inorganic perovskite compound (A) is produced by the reaction, and a perovskite layer is formed.
- (C) component is not adhered and at least one of (B1) and (B2) components is adhered, (B1) and (B2) components remain as they are, and (B1) and (B1) component A side surface protective layer is formed by at least one of them.
- the component (C) When the component (C) is used for the side surface protective layer, in a region where both of the components (B1) and (B2) and the component (C) are attached, the organic inorganic perovskite compound (A) is reacted with each other. And a perovskite layer is formed. In the region where at least one of the components (B1) and (B2) is not adhered and the component (C) is adhered, the component (C) remains as it is, and a side surface protective layer is formed.
- the component (C) is attached to the region to which at least one of the components (B1) and (B2) is attached.
- the region to which the component (C) is attached is outside at least a part of the outer periphery of the region to which at least one of the components (B1) and (B2) is attached although it should just protrude, it is preferable to protrude outside from the outer periphery of the region to which at least one of the components (B1) and (B2) is attached.
- the side surface protective layer is formed so as to surround the perovskite layer as shown in FIG.
- the length of the region where the component (B1) and (B2) or the component (C) is adhered to the outside of the region where the other component is adhered is as described above. Corresponds to the width W.
- the protruding length is preferably 0.5 mm or more, more preferably 0.9 mm or more, and further preferably 1.8 mm or more. Further, the protruding length is preferably 20 mm or less, more preferably 10 mm or less, and further preferably 5 mm or less.
- the order in which at least one of the components (B1) and (B2) and the component (C) are attached is not particularly limited, but the component (C) is added after attaching at least one of the components (B1) and (B2). It is preferable to make it adhere.
- the component (C) is attached to the layer. Since the metal halide (B1) and the organic metal halide (B2) can be easily formed as a single film compared to the organic halide (C), the perovskite can be obtained by attaching the components (B1) and (B2) first. The film formability when forming the layer is improved.
- the component for example, (C) component
- the component which adheres later with respect to the layer formed by the component (for example, at least any one of (B1) and (B2) component) adhering previously.
- the perovskite layer is formed so as to be impregnated inside. Therefore, the thickness of the side surface protective layer and the perovskite layer is substantially the same, and it is considered that the side surface of the perovskite layer is appropriately protected by the side surface protective layer.
- a process (c) is performed after a process (b).
- a second electrode is formed on the perovskite layer.
- a method for forming the second electrode is not particularly limited, and may be performed by a sputtering method, an evaporation method, or the like.
- a hole transport layer, an organic semiconductor layer, an inorganic semiconductor layer, or the like may be appropriately formed over the perovskite layer before forming the second electrode.
- a barrier layer may be further formed on the second electrode. The barrier layer may be adhered on the second electrode by an adhesive layer, for example.
- Example 1 An FTO film having a thickness of 1000 nm was formed as a first electrode serving as a cathode on a glass substrate, and ultrasonic cleaning was performed for 10 minutes each using pure water, acetone, and methanol in this order, followed by drying. On the surface of the FTO film, an ethanol solution of titanium isopropoxide adjusted to 2% was applied by spin coating, and then baked at 400 ° C. for 10 minutes to form a thin-film electron transport layer having a thickness of 20 nm.
- a titanium oxide paste containing polyisobutyl methacrylate as an organic binder and titanium oxide (a mixture of an average particle size of 10 nm and 30 nm) is applied onto the thin film electron transport layer by a spin coat method, and then heated to 500 ° C. Was fired for 10 minutes to form a porous electron transport layer having a thickness of 500 nm.
- a solution obtained by mixing lead iodide (PbI 2 ) and N, N-dimethylformamide (DMF) at a molar ratio of 1:10 was applied to the porous electron transport layer.
- the coating was performed using a desktop die coater (Daimon Co., Ltd., trade name “New Table Die S”). Thereafter, DMF as a solvent was dried to adhere lead iodide on the electron transport layer, thereby forming a lead iodide layer.
- the lead iodide layer was formed on a square area (50 ⁇ 50 mm).
- a solution obtained by mixing methylammonium iodide (MAI) and isopropyl alcohol (IPA) at a molar ratio of 1:30 (second coating solution) was placed on the above-mentioned tabletop Daiko on the lead iodide layer.
- the coating was carried out using a sprayer and dried to attach MAI.
- the second coating liquid was applied in a square shape, and all four sides were applied to a narrow area 0.5 mm inward from the outer periphery of the lead iodide layer.
- a 10% by weight cyclohexane solution of a pressure-sensitive adhesive (manufactured by BASF, trade name “OPPANOL B50”) is applied to a thickness of 10 ⁇ m on a 50 ⁇ m-thick aluminum foil used as a barrier layer.
- the solvent was dried to obtain a laminate comprising an adhesive layer / barrier layer.
- the first electrode / electron transport layer / perovskite layer-side surface protective layer / A solar cell was obtained in which the layers were laminated in the order of hole transport layer / second electrode / adhesive layer / barrier layer.
- Example 2 A solar cell was obtained in the same manner as in Example 1 except that the second coating liquid was applied to a region 1.0 mm narrower from the outer periphery to the inner side of the lead iodide layer.
- Example 3 A solar cell was obtained in the same manner as in Example 1 except that the second coating solution was applied to a region 2.0 mm narrower from the outer periphery to the inner side of the lead iodide layer.
- Example 4 A solar cell was obtained in the same manner as in Example 2 except that glass was used instead of aluminum foil as the barrier layer.
- Example 5 A solar cell was obtained in the same manner as in Example 2 except that OPPANOL B80 (trade name, manufactured by BASF) was used as the adhesive instead of OPPANOL B50.
- OPPANOL B80 trade name, manufactured by BASF
- Example 6 A solar cell was obtained in the same manner as in Example 2 except that OPPANOL B100 (trade name, manufactured by BASF) was used instead of OPPANOL B50 as an adhesive.
- OPPANOL B100 trade name, manufactured by BASF
- Example 7 a solution in which lead iodide (PbI 2 ), dimethyl sulfoxide (DMSO) and N, N-dimethylformamide (DMF) are mixed at a molar ratio of 1: 1: 10 (first coating solution) ) was coated on the electron transport layer, and then a solar cell was obtained in the same manner as in Example 2 except that a layer made of lead iodide / DMSO complex was formed by drying DMF as a solvent.
- PbI 2 lead iodide
- DMSO dimethyl sulfoxide
- DMF N-dimethylformamide
- Example 8 The second coating solution was applied in a square shape such that three sides protruded 1.0 mm inward from the outer periphery of the rectangular lead iodide layer and the remaining one side protruded 1.0 mm outward from the outer periphery. Except for this, a solar cell was obtained in the same manner as in Example 1.
- Example 9 The second coating solution was applied in a square shape so that two sides protruded 1.0 mm inward from the outer periphery of the rectangular lead iodide layer and the other two sides protruded 1.0 mm outward from the outer periphery. Except for this, a solar cell was obtained in the same manner as in Example 1.
- Example 10 A solar cell was obtained in the same manner as in Example 8, except that OPPANOL B80 (trade name, manufactured by BASF) was used instead of OPPANOL B50 as the adhesive.
- OPPANOL B80 trade name, manufactured by BASF
- Example 11 A solar cell was obtained in the same manner as in Example 8 except that glass was used instead of aluminum foil as the barrier layer.
- Example 12 A solar cell was obtained in the same manner as in Example 1 except that the second coating solution was coated in a square shape so that all four sides protruded 0.7 mm outward from the outer periphery of the lead iodide layer.
- Example 13 The second coating solution was applied in a square shape so that one side protrudes from the outer periphery of the rectangular lead iodide layer to a 0.7 mm narrow area and the remaining three sides protrude 1.5 mm from the outer periphery to the outer side. Except for this, a solar cell was obtained in the same manner as in Example 1.
- Example 14 The second coating solution was carried out except that three sides were made to be 1.5 mm narrow from the outer periphery of the rectangular lead iodide layer to the inside and the other side was made to coincide with the region where the lead iodide layer was formed.
- a solar cell was obtained in the same manner as in Example 1.
- Example 15 The second coating solution was carried out except that two sides were made narrower by 2.0 mm inward from the outer periphery of the rectangular lead iodide layer, and the remaining two sides were made to coincide with the region where the lead iodide layer was formed.
- a solar cell was obtained in the same manner as in Example 1.
- Example 1 The region where the solution (second coating solution) in which methylammonium iodide (MAI) and isopropyl alcohol (IPA) are mixed at a molar ratio of 1:30 is made to coincide with the region where the lead iodide layer is formed.
- MAI methylammonium iodide
- IPA isopropyl alcohol
- the durability test was conducted by placing the solar cell under conditions of 85% relative humidity and 85 ° C. for 200 hours.
- a power source (made by KEITHLEY, 236 model) is connected between the electrodes of the solar cell before and after the durability test, and the photoelectric conversion efficiency is measured using a solar simulator (made by Yamashita Denso Co., Ltd.) at an intensity of 100 mW / cm 2.
- the ratio of the photoelectric conversion efficiency after the durability test to the previous photoelectric conversion efficiency was calculated as a percentage. When the value was 80% or more, it was evaluated as “A”, 30% or more and less than 80% as “B”, and less than 30% as “C”.
- the evaluation results of the durability test are shown in Table 1.
- the number of sides covered by the outer periphery represents the number of sides covered by the side surface protective layer among the four outer sides of the perovskite layer.
- the outer peripheral width represents the shortest distance from the outer periphery of the region coated with the first coating liquid on each side to the outer periphery of the region coated with the second coating liquid.
- Examples 1 to 15 by providing a side surface protective layer on the outer peripheral side of the perovskite layer, it is possible to prevent moisture from entering the perovskite layer from the side surface as compared with Comparative Example 1 in which the side surface protective layer is not provided. The durability of the solar cell could be improved. Further, as shown in Examples 1 to 13, when the side surface protective layer is provided so as to be connected to the outer peripheral four sides of the perovskite layer so that the side surface protective layer surrounds the perovskite layer, durability can be further improved. did it.
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Abstract
Description
本発明は、以上の事情に鑑みてなされたものであり、光電変換層の側面からの水分浸入による劣化に対して、高い耐久性を有する太陽電池を提供することを課題とする。
[1]第1及び第2の電極と、
前記第1及び第2の電極の間に配置されるとともに、一般式RMX3(ただし、Rは有機分子、Mは金属原子、Xはハロゲン原子である)で表される有機無機ペロブスカイト化合物(A)を含むペロブスカイト層と、
前記ペロブスカイト層の外周側に、前記ペロブスカイト層の側面の少なくとも一部を被覆するように設けられ、かつ金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つ又は有機ハロゲン化物(C)を含む側面保護層と
を備える太陽電池。
[2]前記側面保護層が、前記ペロブスカイト層を全周にわたって取り囲むように設けられる上記[1]に記載の太陽電池。
[3]前記有機無機ペロブスカイト化合物(A)が、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つと、有機ハロゲン化物(C)との反応生成物である上記[1]又は[2]に記載の太陽電池。
[4]前記有機ハロゲン化物(C)が、ハロゲン化アルキルアンモニウムである上記[3]に記載の太陽電池。
[5]前記側面保護層は、前記ペロブスカイト層の外周から外側に0.5mm以上の幅を有する上記[1]~[4]のいずれか1項に記載の太陽電池。
[6]第1の電極を形成する工程と、
前記第1の電極上において、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つを付着させるとともに、有機ハロゲン化物(C)を付着させることにより、ペロブスカイト層を少なくとも形成する工程と、
前記ペロブスカイト層の上に第2の電極を形成する工程とを備え、
前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域は、前記有機ハロゲン化物(C)が付着する領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出る又は
前記有機ハロゲン化物(C)が付着する領域は、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出る太陽電池の製造方法。
[7]前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域は、前記有機ハロゲン化物(C)が付着する領域の外周より全周にわたってはみ出る上記[6]に記載の太陽電池の製造方法。
[8]前記有機ハロゲン化物(C)が付着する領域は、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域の外周より全周にわたってはみ出る上記[6]に記載の太陽電池の製造方法。
[9]前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つを付着させた後に、前記有機ハロゲン化物(C)を付着させる上記[6]、[7]又は[8]に記載の太陽電池の製造方法。
本発明の太陽電池は、いずれか一方が陰極、他方が陽極となる第1及び第2の電極と、これら第1及び第2の電極の間に配置されるペロブスカイト層と、ペロブスカイト層の外周側に配置され、かつペロブスカイト層の側面を被覆するように設けられる側面保護層とを備える。
ペロブスカイト層は、有機無機ペロブスカイト化合物(A)を含む層であり、光電変換層となるものである。また、側面保護層は、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)から選択される少なくとも1つ又は有機ハロゲン化物(C)を含む層である。本発明においては、ペロブスカイト層の外周側に側面保護層を設けることで、側面からの水分浸入によって、光電変換層(ペロブスカイト層)が劣化するのを防止する。
なお、以下の説明では、有機無機ペロブスカイト化合物(A)を省略して単に“(A)成分”ということがある。他の化合物についても同様である。
有機無機ペロブスカイト化合物(A)は、以下の一般式(1)で表される化合物である。
RMX3 ・・・(1)
(ただし、式(1)において、Rは有機分子、Mは金属原子、Xはハロゲン原子である。)
光電変換層であるペロブスカイト層に一般式(1)で示される有機無機ペロブスカイト化合物(A)を含有させることにより、太陽電池の光電変換効率を良好にすることができる。なお、光電変換層に有機無機ペロブスカイト化合物(A)を利用した太陽電池は、有機無機ハイブリッド型太陽電池とも呼ばれる。
Rの有機分子は、上記した中でも、アルキルアミン及びそのイオンが好ましく、中でもメチルアミン、エチルアミン、プロピルアミン、ブチルアミン、ペンチルアミン、ヘキシルアミンなどの1級アルキルアミン及びこれらのイオンが好ましく、メチルアミン、エチルアミン、プロピルアミン及びそのイオンがより好ましく、メチルアミン及びそのイオンがさらに好ましい。
Rで示される有機分子は、1種単独で使用してもよいし、2種以上を併用してもよい。
金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)の少なくともいずれかは、側面保護層を構成しうる成分の1つである。また、有機ハロゲン化物(C)と反応して有機無機ペロブスカイト化合物(A)を生成するものである。本発明においては、側面保護層に、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)の少なくともいずれかを使用することで、ペロブスカイト層への水分浸入を適切に防止することが可能である。また、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)は、上記のように有機無機ペロブスカイト化合物(A)の原料(前駆体)にもなるものであり、これらをペロブスカイト層の原料として使用することで、側面保護層とペロブスカイト層の形成が容易になる。
また、側面保護層及びペロブスカイト層の形成を容易にする観点から、側面保護層に含有される金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)は、ペロブスカイト層に含有される有機無機ペロブスカイト化合物(A)の前駆体として使用されるものと同一の化合物であることが好ましい。
MXk ・・・(2)
(ただし、M、及びXはそれぞれ、式(1)におけるM、及びXと同義である。kは1~3の整数である。)
式(2)において、kは2であることが好ましい。なお、金属ハロゲン化物(B1)におけるM、Xの詳細な説明は上記と同様であるので省略する。
なお、1価ハロゲン化インジウムなどの各種の1価金属ハロゲン化物を使用する場合には、各種の3価金属ハロゲン化物と混合して使用すればよい。
化合物(B3)としては、スルホキシド化合物、アミド化合物等が挙げられる。また、後述するように金属ハロゲン化物(B1)に混合して使用する溶媒も、金属ハロゲン化物(B1)の種類によっては、金属ハロゲン化物(B1)と錯体を形成し得る化合物(B3)になり得ることもある。
上記スルホキシド化合物としては、一般式Y-S(=O)-Y’で表される化合物が挙げられる。ここで、Y及びY’は、置換基を有していてもよい炭素数1~18の炭化水素基を表し、例えば、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ペプチル基、オクチル基、デシル基、ドデシル基、メチレン基、フェニル基、ナフチル基、ビフェニル基、メトキシ基、エトキシ基、プロポキシ基、ブトキシ基等が挙げられる。これらの中では、メチル基、エチル基、プロピル基、n-ブチル基、t-ブチル基、フェニル基が好ましく、特にメチル基が好ましい。なお、YとY’は互いに同一であってもよく異なっていてもよい。
化合物(B3)としては、これらの中では、スルホキシド化合物が好ましく、より好ましくはジメチルスルホキシド(DMSO)である。
有機金属ハロゲン化物(B2)の生成方法は、特に限定されないが、金属ハロゲン化物(B1)と、化合物(B3)とを混合する方法などが挙げられる。
金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)は、これらから選択される1種を単独で用いてもよいし、2種以上を併用してもよい。
有機ハロゲン化物(C)は、側面保護層を構成しうる成分の1つである。本発明においては、側面保護層に、有機ハロゲン化物(C)を使用することで、ペロブスカイト層へ浸入する水分が有機ハロゲン化物(C)に吸収されることから、ペロブスカイト層まで水分が到達し難くなり、ペロブスカイト層の劣化を防止することが可能である。また、有機ハロゲン化物(C)は、上記のように有機無機ペロブスカイト化合物(A)の原料(前駆体)にもなるものであり、これらをペロブスカイト層の原料として使用することで、側面保護層とペロブスカイト層の形成が容易になる。
RX ・・・(3)
(ただし、R、及びXはそれぞれ、式(1)におけるR及びXと同義である。)
なお、有機ハロゲン化物(C)におけるR、Xの詳細な説明は上記と同様であるので省略する。
有機ハロゲン化物(C)の具体例は、上記したRで示される有機分子のハロゲン化物が挙げられる。中でも、塩化メチルアンモニウム、臭化メチルアンモニウム、ヨウ化メチルアンモニウム、塩化エチルアンモニウム、臭化エチルアンモニウム、ヨウ化エチルアンモニウム、塩化プロピルアンモニウム、臭化プロピルアンモニウム、ヨウ化プロピルアンモニウム、塩化ブチルアンモニウム、臭化ブチルアンモニウム、ヨウ化ブチルアンモニウム、塩化ペンチルアンモニウム、臭化ペンチルアンモニウム、ヨウ化ペンチルアンモニウム、塩化ヘキシルアンモニウム、臭化ヘキシルアンモニウム、ヨウ化ヘキシルアンモニウムが好ましく、ヨウ化メチルアンモニウム、ヨウ化エチルアンモニウム、ヨウ化プロピルアンモニウムがより好ましく、ヨウ化メチルアンモニウムが特に好ましい。
有機ハロゲン化物は、1種単独で用いてもよく、2種以上を併用してもよい。
ペロブスカイト層に含まれる有機無機ペロブスカイト化合物(A)以外の成分としては、有機半導体及び無機半導体の少なくともいずれが挙げられる。また、有機無機ペロブスカイト化合物(A)を形成するときの原料の未反応物(例えば、(B1)、(B2)及び(C)成分)などが含まれていてもよい。
有機半導体としては、例えば、ポリ(3-アルキルチオフェン)等のチオフェン骨格を有する化合物等が挙げられる。また、例えば、ポリパラフェニレンビニレン骨格、ポリビニルカルバゾール骨格、ポリアニリン骨格、ポリアセチレン骨格等を有する導電性高分子等も挙げられる。更に、例えば、フタロシアニン骨格、ナフタロシアニン骨格、ペンタセン骨格、ベンゾポルフィリン骨格等のポルフィリン骨格、スピロビフルオレン骨格等を有する化合物、表面修飾されていてもよいカーボンナノチューブ、グラフェン、フラーレン等のカーボン含有材料も挙げられる。
また、無機半導体としては、例えば、酸化チタン、酸化亜鉛、酸化インジウム、酸化スズ、酸化ガリウム、硫化スズ、硫化インジウム、硫化亜鉛、CuSCN、Cu2O、MoO3、V2O5、WO3、MoS2、MoSe2、Cu2S等が挙げられる。
また、上記有機半導体及び無機半導体の少なくともいずれかは、有機半導体層、無機半導体層として形成され、ペロブスカイト層と積層構造を形成して、ペロブスカイト層とともに光電変換層の機能を有してもよい。また、これら有機半導体層又は無機半導体層は、後述する電子輸送層又はホール輸送層の役割を果たすこともある。
側面保護層に含まれる金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)以外の成分としては、上記した有機半導体、無機半導体などが挙げられる。
本発明の太陽電池は、第1及び第2の電極と、これら第1及び第2の電極の間に配置されるペロブスカイト層と、ペロブスカイト層の外周側に配置される側面保護層とを備えるものであるが、本発明の効果を損なわない範囲において、第1及び第2の電極、ペロブスカイト層、及び側面保護層以外の層を有していてもよい。
例えば、陰極(第1又は第2の電極)とペロブスカイト層の間に電子輸送層が設けられてもよいし、陽極(第1又は第2の電極)とペロブスカイト層の間にホール輸送層が設けられてもよい。
また、太陽電池にはバリア層が設けられ、厚さ方向に沿う水分浸入などがバリア層によって保護されてもよい。バリア層は、第1及び第2の電極の一方又は両方のペロブスカイト層が設けられる側とは反対側に設けられるとよい。また、バリア層は、例えば、接着層を介して第1又は第2の電極に接着されるとよい。さらに、上記したように、ペロブスカイト層に積層するように、無機半導体層、有機半導体層などが設けられてもよい。
また、太陽電池は、基板を有することが好ましく、第1及び第2の電極、ペロブスカイト層、側面保護層、及び必要に応じて設けられるその他の層を有する積層体が基板上に設けられるとよい。
図2は、本発明に係る側面保護層及びペロブスカイト層の構造の一実施形態を示す模式的な斜視図である。以下、図2を参照しつつ、側面保護層及びペロブスカイト層の構造についてより詳細に説明する。
図2に示すように、側面保護層15は、ペロブスカイト層14に連続するようにペロブスカイト層14の外周側に設けられ、ペロブスカイト層14の側面を被覆する。これにより、ペロブスカイト層14は、側面保護層15によって側面が露出することが防止され、側面からの水分浸入等が防止される。
本発明の一実施形態において、ペロブスカイト層14の外周側に設けられた側面保護層15は、図2に示すように、ペロブスカイト層14を全周にわたって取り囲むように設けられる。この場合、ペロブスカイト層14の側面は、全周が側面保護層15によって被覆され、側面からの水分浸入を効果的に防ぐことが可能になる。
なお、ペロブスカイト層14を平面視した形状は、四角形に限定されず、三角形、五角形、六角形などの四角形以外の多角形形状、円形、楕円形などの曲線を有する形状であってもよい。
このように、側面保護層15とペロブスカイト層14が同一表面上に形成されると、ペロブスカイト層14の側面が、側面保護層15によって保護されやすくなる。また、側面保護層15は、後述する製造方法ではペロブスカイト層14を形成するための工程によって同時に形成されるが、そのような製造方法によって形成されやすくなる。
ただし、側面保護層15がペロブスカイト層14の側面を被覆する限り、側面保護層15とペロブスカイト層14は必ずしも同一表面上に形成される必要はなく、例えば、ペロブスカイト層14が電子輸送層13の表面上に形成される一方で、側面保護層15が第1の電極12又は基板11の表面上に形成されてもよい。
側面保護層及びペロブスカイト層の厚さは、互いに同一であってもよいが、異なってもよい。ただし、側面保護層によってペロブスカイト層の側面を保護できるように、互いの厚さは同一であるか、また異なっていてもその差はできる限り小さいほうがよい。
本発明の太陽電池で使用される第1及び第2の電極は、いずれか一方が陰極、他方が陽極となるものである。陰極を構成する材料としては、例えば、FTO(フッ素ドープ酸化スズ)、ナトリウム、ナトリウム-カリウム合金、リチウム、マグネシウム、アルミニウム、マグネシウム-銀混合物、マグネシウム-インジウム混合物、アルミニウム-リチウム合金、Al/Al2O3混合物、Al/LiF混合物等が挙げられる。これらの材料は単独で用いられてもよく、2種以上が併用されてもよい。
陰極の厚さは、特に限定されず、例えば、1nm~10μm、好ましくは10~5000nmである。
陽極を構成する材料としては、例えば、金、銀等の金属、CuI、ITO(インジウムスズ酸化物)、SnO2、AZO(アルミニウム亜鉛酸化物)、IZO(インジウム亜鉛酸化物)、GZO(ガリウム亜鉛酸化物)等の導電性透明材料、導電性透明ポリマー等が挙げられる。これらの材料は単独で用いられてもよく、2種以上が併用されてもよい。
陽極の厚さは、特に限定されず、例えば、1nm~10μm、好ましくは10~2000nmである。
第1及び第2の電極は、層状に形成されていてもよいし、適宜パターニングされていてもよい。
上記したように、本発明の太陽電池において陰極と光電変換層(ペロブスカイト層)の間には、電子輸送層が配置されてもよい。電子輸送層の材料は、特に限定されず、例えば、N型導電性高分子、N型低分子有機半導体、N型金属酸化物、N型金属硫化物、ハロゲン化アルカリ金属、アルカリ金属、界面活性剤等が挙げられる。具体的には例えば、シアノ基含有ポリフェニレンビニレン、ホウ素含有ポリマー、バソクプロイン、バソフェナントレン、ヒドロキシキノリナトアルミニウム、オキサジアゾール化合物、ベンゾイミダゾール化合物、ナフタレンテトラカルボン酸化合物、ペリレン誘導体、ホスフィンオキサイド化合物、ホスフィンスルフィド化合物、フルオロ基含有フタロシアニン、酸化チタン、酸化亜鉛、酸化インジウム、酸化スズ、酸化ガリウム、硫化スズ、硫化インジウム、硫化亜鉛等が挙げられる。
電子輸送層は、非多孔質の薄膜状の電子輸送層のみからなってもよいが、多孔質状の電子輸送層を含むことが好ましく、非多孔質の薄膜状の電子輸送層の上に、多孔質状の電子輸送層が形成されることがより好ましい。そして、その多孔質状の電子輸送層上にペロブスカイト層が形成されることが好ましい。また、電子輸送層には適宜添加剤が含有されていてもよい。
また、本発明の太陽電池においては、陽極と光電変換層(ペロブスカイト層)との間に、ホール輸送層が配置されてもよい。ホール輸送層の材料は特に限定されず、例えば、P型導電性高分子、P型低分子有機半導体、P型金属酸化物、P型金属硫化物、界面活性剤等が挙げられ、具体的には例えば、ポリエチレンジオキシチオフェンのポリスチレンスルホン酸付加物、カルボキシル基含有ポリチオフェン等のチオフェン骨格を有する化合物等が挙げられる。また、フタロシアニンなどのフタロシアニン骨格、ポルフィリン等のポルフィリン骨格、2,2’,7,7’-テトラキス(N,N-ジ-p-メトキシフェニルアミン)-9,9’-スピロビフルオレン(Spiro-OMeTAD)などのスピロビフルオレン骨格等を有する化合物等が挙げられる。さらには、酸化モリブデン、酸化バナジウム、酸化タングステン、酸化ニッケル、酸化銅、酸化スズ、硫化モリブデン、硫化タングステン、硫化銅、硫化スズ、CuSCN、CuI、フルオロ基含有ホスホン酸、カルボニル基含有ホスホン酸、表面修飾されていてもよいカーボンナノチューブ、グラフェン等のカーボン含有材料等が挙げられる。また、ホール輸送層には適宜添加剤が含有されていてもよい。
太陽電池では、第1及び第2の電極の一方又は両方のペロブスカイト層が設けられる側とは反対側に、バリア層が設けられてもよい。太陽電池は、バリア層が設けられる場合、基板の上に、第1の電極、ペロブスカイト層及び側面保護層、第2の電極、並びにバリア層がこの順に設けられることが好ましい。
バリア層は、太陽電池の厚さ方向に沿う水分浸入を防止するための層である。また、バリア層により、異物等から太陽電池を保護することもできる。バリア層としては、例えば、アルミニウム、金、銀、銅、鉄、チタン、ニッケルなどの各種金属であってもよいし、ガラス、セラミック基板、プラスチック基板などであってもよい。また、金属酸化物、金属窒化物、金属酸窒化物などの無機層であってもよいし、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリシクロオレフィン、ポリイソブチレン、アクリル樹脂等の各種樹脂によって形成された樹脂層であってもよいし、これらの積層体であってもよい。
バリア層の厚さは、特に限定されないが、10nm~200μmであることが好ましく、50nm~100μmがより好ましい。
また、接着層を設けて、バリア層を接着層を介して第1又は第2の電極に接着させてもよい。接着層としては、ゴム系粘着剤、アクリル系粘着剤、シリコーン系粘着剤などの各種粘着剤が挙げられる。また、接着層に使用する粘着剤としてはバリア性が高い粘着剤を用いることが好ましい。
本発明の太陽電池に使用される基板は、特に限定されず、透明な基材が好適であり、例えば、ソーダライムガラス、無アルカリガラス等の透明ガラス基板、セラミック基板、透明プラスチック基板等が挙げられる。
次に、本発明の太陽電池の製造方法について説明する。
本発明の太陽電池の製造方法は、例えば、以下の工程(a)~(c)を備えるものである。
工程(a):第1の電極を形成する工程と、
工程(b):前記第1の電極上において、ペロブスカイト層及び側面保護層を形成する工程と、
工程(c):前記ペロブスカイト層の上に、第2の電極を形成する工程
工程(a)にて第1の電極を形成する方法は、特に限定されないが、例えば、基板の上に常法により電極を形成すればよい。また、第1の電極の上には、ペロブスカイト層を形成する前に、電子輸送層、有機半導体層、無機半導体層などを適宜形成してもよい。
本製造方法では、工程(a)の後に、工程(b)を行う。工程(b)では、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)から選択される少なくとも1つを付着させる工程(b1)と、有機ハロゲン化物(C)を付着させる工程(b2)により少なくともペロブスカイト層を形成する。ペロブスカイト層は、上述したように、有機無機ペロブスカイト化合物(A)を含む層である。上記工程(b1)と上記工程(b2)はどちらを先に行ってもよい。
また、第1の塗工液を塗工した後、適宜加熱等して第1の塗工液を乾燥してもよい。
また、第2の塗工液を塗工した後、適宜加熱等して第2の塗工液を乾燥してもよい。
第1及び第2の塗工液の塗工方法は特に限定されず、ダイコート法、スピンコート法、キャスト法等が挙げられる。また、ロールtoロール法等の印刷法も採用することができる。
なお、(B1)及び(B2)成分、及び(C)成分は、第1の電極の上に直接付着させてもよいが、第1の電極の上に電子輸送層などの電極以外の層が形成されていればその層上に付着させればよい。
すなわち、(B1)及び(B2)成分の少なくともいずれかを側面保護層に用いる場合、(B1)及び(B2)成分の少なくともいずれかが付着する領域は、(C)成分が付着される領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出ることになる。また、(C)成分を側面保護層に用いる場合、(C)成分が付着する領域は、(B1)及び(B2)成分の少なくともいずれかが付着される領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出ることになる。これにより、(B1)及び(B2)成分の少なくともいずれかを側面保護層に用いる場合、(B1)及び(B2)成分の少なくともいずれかと、(C)成分の両方が付着した領域では、これらが反応して有機無機ペロブスカイト化合物(A)が生成し、ペロブスカイト層が形成される。また、(C)成分が付着されず(B1)及び(B2)成分の少なくともいずれかが付着された領域では、(B1)、(B2)成分がそのまま残り、(B1)及び(B1)成分の少なくともいずれかにより側面保護層が形成される。(C)成分を側面保護層に用いる場合、(B1)及び(B2)成分の少なくともいずれかと、(C)成分の両方が付着した領域では、これらが反応して有機無機ペロブスカイト化合物(A)が生成し、ペロブスカイト層が形成される。また、(B1)及び(B2)成分の少なくともいずれかが付着されず(C)成分が付着された領域では、(C)成分がそのまま残り、側面保護層が形成される。
また、(B1)及び(B2)成分の少なくともいずれか又は(C)成分が付着される領域が、他方の成分が付着される領域の外周より外側にはみ出す長さ(はみ出し長さ)は、上記した幅Wに対応する。そのため、はみ出し長さは、好ましくは0.5mm以上、より好ましくは0.9mm以上、さらに好ましくは1.8mm以上である。また、はみ出し長さは、20mm以下が好ましく、10mm以下がより好ましく、5mm以下がさらに好ましい。
また、本製造方法では、先に付着した成分(例えば、(B1)及び(B2)成分の少なくともいずれか)により形成された層に対して、後で付着する成分(例えば、(C)成分)が内部に含浸するようにしてペロブスカイト層が形成される。そのため、側面保護層とペロブスカイト層の厚さは、実質的に同一となり、ペロブスカイト層の側面が側面保護層により適切に保護されると考えられる。
本製造方法では、工程(b)の後、工程(c)を行う。工程(c)においては、ペロブスカイト層の上に第2の電極を形成する。第2の電極を形成する方法は、特に限定されず、スパッタ法、蒸着法等により行うとよい。
また、第2の電極を形成する前に、ペロブスカイト層の上に、ホール輸送層、有機半導体層、無機半導体層などを適宜形成してもよい。さらに、第2の電極の上には、さらにバリア層を形成してもよい。バリア層は、例えば、接着層によって第2の電極の上に接着させてもよい。
ガラス基板上に、陰極となる第1の電極として厚さ1000nmのFTO膜を形成し、純水、アセトン、メタノールをこの順に用いて各10分間超音波洗浄した後、乾燥させた。FTO膜の表面上に、2%に調整したチタンイソプロポキシドのエタノール溶液をスピンコート法により塗布した後、400℃で10分間焼成し、厚さ20nmの薄膜状の電子輸送層を形成した。更に、薄膜状の電子輸送層上に、有機バインダとしてのポリイソブチルメタクリレートと酸化チタン(平均粒子径10nmと30nmとの混合物)とを含有する酸化チタンペーストをスピンコート法により塗布した後、500℃で10分間焼成し、厚さ500nmの多孔質状の電子輸送層を形成した。
ヨウ化鉛とMAIがいずれも付着した領域では、ヨウ化鉛とヨウ化メチルアンモニウムが反応して、組成式(CH3NH3PbI3)で表される有機無機ペロブスカイト化合物が生成され、ペロブスカイト層が形成された。また、MAIが付着されないが、ヨウ化鉛が付着した領域には、ヨウ化鉛層からなる側面保護層が形成された。したがって、ペロブスカイト層の側面は、図2に示すように、4辺とも側面保護層に被覆されており、側面保護層により取り囲まれる状態となった。ペロブスカイト層及び側面保護層の厚さは、それぞれ400nmであった。
第2の塗工液を、ヨウ化鉛層の外周から内側に1.0mm狭い領域に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
第2の塗工液を、ヨウ化鉛層の外周から内側に2.0mm狭い領域に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
バリア層としてアルミ箔の代わりにガラスを用いたこと以外は実施例2と同一の方法で太陽電池を得た。
粘着剤として、OPPANOL B50の代わりにOPPANOL B80(商品名.BASF社製)を用いたこと以外は実施例2と同一の方法で太陽電池を得た。
粘着剤として、OPPANOL B50の代わりに、OPPANOL B100(商品名.BASF社製)を用いたこと以外は実施例2と同一の方法で太陽電池を得た。
ヨウ化鉛層の代わりに、ヨウ化鉛(PbI2)とジメチルスルホキシド(DMSO)とN,N-ジメチルホルムアミド(DMF)をモル比1:1:10で混合した溶液(第1の塗工液)を電子輸送層上に塗工した後、溶剤であるDMFを乾燥させることでヨウ化鉛・DMSO錯体からなる層を形成したこと以外は実施例2と同一の方法で太陽電池を得た。
第2の塗工液を、3辺は四角形状のヨウ化鉛層の外周から内側に1.0mm狭い領域に、残り1辺は外周から外側に1.0mmはみ出るように四角形状に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
第2の塗工液を、2辺は四角形状のヨウ化鉛層の外周から内側に1.0mm狭い領域に、残り2辺は外周から外側に1.0mmはみ出るように四角形状に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
粘着剤として、OPPANOL B50の代わりに、OPPANOL B80(商品名.BASF社製)を用いたこと以外は実施例8と同一の方法で太陽電池を得た。
バリア層としてアルミ箔の代わりにガラスを用いたこと以外は実施例8と同一の方法で太陽電池を得た。
第2の塗工液を、4辺ともヨウ化鉛層の外周から外側に0.7mmはみ出るように四角形状に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
第2の塗工液を、1辺は四角形状のヨウ化鉛層の外周から内側に0.7mm狭い領域に、残り3辺は外周から外側に1.5mmはみ出るように四角形状に塗工したこと以外は実施例1と同一の方法で太陽電池を得た。
第2の塗工液を3辺は四角形状のヨウ化鉛層の外周から内側に1.5mm狭い領域に、残り1辺はヨウ化鉛層が形成された領域に一致させたこと以外は実施例1と同一の方法で太陽電池を得た。
第2の塗工液を2辺は四角形状のヨウ化鉛層の外周から内側に2.0mm狭い領域に、残り2辺はヨウ化鉛層が形成された領域に一致させたこと以外は実施例1と同一の方法で太陽電池を得た。
ヨウ化メチルアンモニウム(MAI)とイソプロピルアルコール(IPA)をモル比1:30で混合した溶液(第2の塗工液)を塗工する領域を、ヨウ化鉛層が形成された領域に一致させた以外は、実施例1と同様に実施した。
実施例及び比較例で得られた太陽電池について、以下の評価を行った。
[耐久性評価]
太陽電池を相対湿度85%、温度85℃の条件下に200時間置いて耐久試験を行った。耐久試験前後の太陽電池の電極間に電源(KEITHLEY社製、236モデル)を接続し、強度100mW/cm2でソーラシミュレータ(山下電装株式会社製)を用いて光電変換効率を測定し、耐久試験前の光電変換効率に対する耐久試験後の光電変換効率の比を百分率で算出した。また、その値が80%以上である場合は、“A”、30%以上80%未満を“B”、30%未満を“C”と評価した。耐久性試験の評価結果を表1に示す。
11 基板
12 第1の電極
13 電子輸送層
14 ペロブスカイト層
15 側面保護層
16 ホール輸送層
17 第2の電極
18 接着層
19 バリア層
Claims (9)
- 第1及び第2の電極と、
前記第1及び第2の電極の間に配置されるとともに、一般式RMX3(ただし、Rは有機分子、Mは金属原子、Xはハロゲン原子である)で表される有機無機ペロブスカイト化合物(A)を含むペロブスカイト層と、
前記ペロブスカイト層の外周側に、前記ペロブスカイト層の側面の少なくとも一部を被覆するように設けられ、かつ金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つ又は有機ハロゲン化物(C)を含む側面保護層と
を備える太陽電池。 - 前記側面保護層が、前記ペロブスカイト層を全周にわたって取り囲むように設けられる請求項1に記載の太陽電池。
- 前記有機無機ペロブスカイト化合物(A)が、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つと、有機ハロゲン化物(C)との反応生成物である請求項1又は2に記載の太陽電池。
- 前記有機ハロゲン化物(C)が、ハロゲン化アルキルアンモニウムである請求項3に記載の太陽電池。
- 前記側面保護層は、前記ペロブスカイト層の外周から外側に0.5mm以上の幅を有する請求項1~4のいずれか1項に記載の太陽電池。
- 第1の電極を形成する工程と、
前記第1の電極上において、金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つを付着させるとともに、有機ハロゲン化物(C)を付着させることにより、ペロブスカイト層を少なくとも形成する工程と、
前記ペロブスカイト層の上に第2の電極を形成する工程とを備え、
前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域は、前記有機ハロゲン化物(C)が付着する領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出る
又は前記有機ハロゲン化物(C)が付着する領域は、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域に重なり、かつその領域の外周の少なくとも一部より外側にはみ出る太陽電池の製造方法。 - 前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域は、前記有機ハロゲン化物(C)が付着する領域の外周より全周にわたってはみ出る請求項6に記載の太陽電池の製造方法。
- 前記有機ハロゲン化物(C)が付着する領域は、前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つが付着する領域の外周より全周にわたってはみ出る請求項6に記載の太陽電池の製造方法。
- 前記金属ハロゲン化物(B1)及び有機金属ハロゲン化物(B2)からなる群から選択される少なくとも1つを付着させた後に、前記有機ハロゲン化物(C)を付着させる請求項6、7又は8に記載の太陽電池の製造方法。
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