WO2023037853A1 - ペロブスカイト太陽電池 - Google Patents
ペロブスカイト太陽電池 Download PDFInfo
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- WO2023037853A1 WO2023037853A1 PCT/JP2022/031500 JP2022031500W WO2023037853A1 WO 2023037853 A1 WO2023037853 A1 WO 2023037853A1 JP 2022031500 W JP2022031500 W JP 2022031500W WO 2023037853 A1 WO2023037853 A1 WO 2023037853A1
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- 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
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- 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
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- 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
- H10K30/40—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers
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- 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
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- 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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K39/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic radiation-sensitive element covered by group H10K30/00
- H10K39/10—Organic photovoltaic [PV] modules; Arrays of single organic PV cells
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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
- This invention relates to perovskite solar cells.
- WO2018/052032 describes a structure for sealing the entire side surface of an organic insulating layer covering the entire perovskite solar cell.
- the organic insulating layer is sealed with a barrier layer.
- the problem of water entering from the interface between the barrier layer and the transparent electrode has not been solved.
- One of the purposes of this invention is to provide a highly durable perovskite solar cell.
- the solar cell described in this specification includes a support, a solar cell element provided on the support, an adhesive layer covering the solar cell element, a sealant layer covering the adhesive layer, and a sealing a sealing portion provided at an edge region of the agent layer and covering the edge region.
- the solar cell element includes, in this order, an electrode, a photoelectric conversion layer containing a perovskite compound, and a backside electrode.
- the distance (d1) between the edge of the solar cell element and the edge of the adhesive layer is 0.5 mm or more and 2 cm or less.
- the distance (d2) between the edge of the adhesive layer and the edge of the sealant layer is 0.2 mm or more and 1 cm or less.
- the distance (d3) between the edge of the sealant layer and the edge of the sealing portion is 0.5 mm or more and 1.5 cm or less.
- the above solar cell has an opaque sealing part.
- perovskite solar cells that can prevent water from entering and have high durability.
- FIG. 1 is a conceptual diagram showing an example of a cross-sectional view of the solar cell of the present invention.
- FIG. 2 is a conceptual diagram showing an example of a top view of the solar cell of the present invention.
- FIG. 3 is a conceptual diagram showing an example of a cross-sectional view of the solar cell of the present invention.
- FIG. 4 is a conceptual diagram showing an example of a cross-sectional view of the solar cell of the present invention.
- FIG. 5 is a conceptual diagram showing an example of the structure of a perovskite solar cell element (normal type).
- FIG. 6 is a conceptual diagram showing an example of the structure of a perovskite solar cell element (reverse type).
- FIG. 1 is a conceptual diagram showing an example of a cross-sectional view of the solar cell of the present invention.
- FIG. 2 is a conceptual diagram showing an example of a top view of the solar cell of the present invention.
- FIG. 3 is a conceptual diagram showing an example of a cross-section
- FIG. 7 is a conceptual diagram showing a cross-sectional view of a solar cell of an experimental example.
- FIG. 8 is a conceptual diagram showing a top view of the solar cell of the experimental example.
- FIG. 9 is a conceptual diagram showing an example of a cross-sectional view of a solar cell in an experimental example.
- FIG. 10 is a conceptual diagram showing an example of a cross-sectional view of a solar cell in an experimental example.
- the first invention relates to solar cells. 1, 3, and 4 are cross-sectional views of the solar cell, and FIG. 2 is a conceptual diagram showing the top view of the solar cell shown in FIG.
- the solar cells 1, 2, and 3 include first supports 11, 21, and 31, (perovskite) solar cell elements 12, 22, and 32, and an adhesive layer 13. , 23, 33, sealant layers (body portions) 14, 24, 34 covering the entire adhesive layers, and sealing portions 15, 25, 35.
- first supports 11, 21, and 31, (perovskite) solar cell elements 12, 22, and 32 and an adhesive layer 13. , 23, 33, sealant layers (body portions) 14, 24, 34 covering the entire adhesive layers, and sealing portions 15, 25, 35.
- substrates for organic solar cells and organic EL devices can be appropriately used.
- substrates include glass, plastic plates, plastic films, and inorganic crystals.
- Substrates having at least one film selected from a metal film, a semiconductor film, a conductive film and an insulating film formed on part or all of these surfaces can also be suitably used.
- the support is a flexible substrate.
- a solar cell device means a device having a function of receiving light such as sunlight to generate electricity.
- the solar cell element preferably has a shape in which a perovskite layer (light absorption layer/photoelectric conversion layer) is sandwiched between an electron transport layer and a hole transport layer.
- the perovskite layer is preferably a perovskite layer made of an organic-inorganic hybrid compound.
- FIG. 5 a regular structure in which an electron transport layer 46, a perovskite layer 47, a hole transport layer 48, and a backside electrode 49 are formed from the transparent electrode 40 side may be used.
- any reverse type structure in which a hole transport layer 58, a perovskite layer 57, an electron transport layer 56, and a back electrode 59 are formed from the transparent electrode 50 side may be used.
- the electrode is preferably a transparent electrode in order to transmit light.
- the transparent electrode is a layer that serves as a support for the electron transport layer and also has the function of extracting electrons from the perovskite layer (light absorption layer/photoelectric conversion layer). Electrodes are formed on supports 11 , 21 , 31 .
- the transparent electrode is formed of a conductor, and specific examples thereof include a tin-doped indium oxide (ITO) film, an impurity-doped indium oxide (In 2 O 3 ) film, an impurity-doped zinc oxide (ZnO) film, and a fluorine-doped film.
- ITO tin-doped indium oxide
- In 2 O 3 impurity-doped indium oxide
- ZnO impurity-doped zinc oxide
- a tin dioxide (FTO) film, a laminated film formed by laminating these films, gold, silver, copper, aluminum, tungsten, titanium, chromium, nickel, cobalt, and the like can be used. These may be used singly or as a mixture of two or more, and may be a single layer or a laminate. These films may, for example, function as diffusion barrier layers.
- the thickness of these electrodes is not particularly limited, and it is usually preferable to adjust the sheet resistance to 5 to 15 ⁇ / ⁇ (per unit area).
- the electrodes can be obtained by a known film forming method depending on the material to be formed. Further, these electrodes may be formed in a film shape or in a lattice shape such as a mesh shape.
- a known method is used for forming the electrode on the support, and vacuum film formation such as vacuum deposition or sputtering is preferred.
- a patterned transparent electrode may be used, and examples thereof include a method of immersion in a laser or an etching solution, and a method of patterning using a mask during vacuum film formation. In the present invention, any method may be used. It doesn't matter if there is.
- Electron-transporting layers 46 and 56 are preferably electron-transporting semiconductors such as titanium, tin, zinc, iron, tungsten, zirconium, indium, cerium, yttrium, aluminum, magnesium, vanadium, oxides of niobium, cadmium, zinc, and lead. , silver, antimony, bismuth sulfide, cadmium, lead selenide, cadmium telluride, etc. Among these, oxides are particularly preferred. Among them, zinc oxide, tin oxide and titanium oxide are particularly preferred.
- the electron transport layer may be a single layer or multiple layers, and in the case of multiple layers, it may have a porous shape in which semiconductor fine particles having different particle diameters are coated in multiple layers.
- the particle size of the semiconductor fine particles is preferably 3 to 100 nm, more preferably 5 to 70 nm.
- the film thickness is preferably 5-1000 nm, more preferably 10-500 nm.
- the electron transport layer There are no particular restrictions on the method of forming the electron transport layer. Either vacuum film formation such as sputtering or ion plating or wet film formation such as sol-gel may be used.
- the hole transport layers 48 and 58 are layers having a function of transporting charges.
- a conductor, a semiconductor, an organic hole transport material, or the like can be used for the hole transport layer.
- the material can function as a hole transport material that accepts holes from the perovskite layer (light absorbing layer) and transports the holes.
- the conductors and semiconductors include compound semiconductors containing monovalent copper such as CuI, CuInSe 2 and CuS ; compounds containing metals. Among them, a semiconductor containing monovalent copper is preferable, and CuI is more preferable, from the viewpoint of receiving only holes more efficiently and obtaining higher hole mobility.
- organic hole transport materials include polythiophene derivatives such as poly-3-hexylthiophene (P3HT) and polyethylenedioxythiophene (PEDOT); fluorene derivatives such as -p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD); carbazole derivatives such as polyvinylcarbazole; poly[bis(4-phenyl)(2,4,6-trimethylphenyl ) amine] (PTAA) and other triphenylamine derivatives; diphenylamine derivatives; polysilane derivatives; and polyaniline derivatives.
- polythiophene derivatives such as poly-3-hexylthiophene (P3HT) and polyethylenedioxythiophene (PEDOT); fluorene derivatives such as -p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD); carbazole derivatives such as poly
- triphenylamine derivatives, fluorene derivatives, and the like are preferable, and PTAA, Spiro-OMeTAD, and the like are more preferable, from the viewpoint of receiving only holes more efficiently and obtaining higher hole mobility.
- Lithium bis(trifluoromethylsulfonyl)imide LiTFSI
- silver bis(trifluoromethylsulfonyl)imide silver bis(trifluoromethylsulfonyl)imide, trifluoromethylsulfonyloxysilver , NOSbF6, SbCl5, SbF5, tris(2-(1H-pyrazol-1-yl)-4-tert-butylpyridine) cobalt (III) tri[bis(trifluoromethane)sulfonimide] and other oxidizing agents.
- the hole transport layer may also contain basic compounds such as t-butylpyridine (TBP), 2-picoline, 2,6-lutidine and the like. The contents of the oxidizing agent and the basic compound can be conventionally used amounts.
- the film thickness of the hole transport layer is preferably 50 to 800 nm, more preferably 100 to 600 nm, from the viewpoint of receiving only holes more efficiently and obtaining higher hole mobility.
- a method for forming the hole transport layer is not particularly limited, and can be carried out according to a known method. For example, wet film formation such as dipping, spraying, spin coating, and blade coating, and vacuum film formation such as sputtering may be used.
- Perovskite layer (light absorption layer/photoelectric conversion layer) 47, 57 The perovskite layers (light absorption layer/photoelectric conversion layer) 47 and 57 are layers that perform photoelectric conversion by absorbing light and moving excited electrons and holes.
- the perovskite compound in the present invention is preferably a composite material of an organic compound and an inorganic compound.
- the perovskite compound preferably has a layered perovskite structure in which layers of metal halide and layers of organic cation molecules are alternately laminated, and is represented by the following general formula (1).
- X is a halogen atom
- Y is an alkylamine compound
- M is at least one metal ion selected from lead, tin, indium, antimony, and bismuth
- ⁇ : ⁇ : ⁇ The ratio is 3:1:1 and ⁇ and ⁇ represent integers greater than one.
- X can include halogen atoms such as chlorine, bromine and iodine, and these can be used singly or as a mixture.
- Y can include alkylamine compounds such as methylamine, ethylamine, n-butylamine and formamidine.
- the flatness of the perovskite layer is preferably 50 nm or less (-25 nm to +25 nm) in the horizontal direction of the surface measured by a scanning electron microscope, and the height difference is 40 nm or less ( ⁇ 20 nm to +20 nm). This makes it easier to balance the light absorption efficiency and the exciton diffusion length, and further improves the absorption efficiency of the light reflected by the electrode.
- An example of the method for forming a perovskite layer is a one-step deposition in which a solution in which metal halides and alkylamine halides are dissolved or dispersed in a solvent is coated on the electron-transporting layer or hole-transporting layer and dried.
- method, or a two-step deposition in which a solvent in which metal halides are dissolved or dispersed is coated on the electron-transporting layer or hole-transporting layer, dried, and then immersed in a solution of halogenated alkylamines in a solvent. law, etc.
- the one-step precipitation method it is possible to add a solvent that does not dissolve the perovskite compound before the complete coating to promote crystallization at once.
- a solution in which a halogenated amine compound is dissolved may be applied on the perovskite layer.
- the halogenated amine compound used at this time include phenylethylamine bromide, phenylethylamine iodide, n-hexyltrimethylamine bromide, n-octadecylamine iodide, and 5-ammonium iodide valeric acid. They may be used singly or in combination of two or more.
- Back electrodes 49, 59 Examples of the back electrodes 49 and 59 include metals such as platinum, gold, silver, copper, aluminum, rhodium, nickel, cobalt, iron, palladium, and indium; carbon-based compounds such as graphite, graphene, and carbon nanotubes; Conductive metal oxides such as doped zinc oxide (IZO) and antimony-doped tin oxide (ATO), or conductive polymers such as polythiophene or polyaniline, may be used alone or in combination of two or more. do not have.
- the back electrode may be a transparent electrode.
- the film thickness of the back electrode is not particularly limited, and may be a single film of the above-mentioned materials, or a mixed or laminated film of two or more of them.
- the back electrode can be formed on the hole transport layer by coating, lamination, vacuum deposition, CVD, bonding, or the like depending on the type of material used and the type of the hole transport layer.
- the adhesive layer is a layer covering the solar cell element.
- the adhesive layer may cover the entire solar cell element or may cover a portion of the solar cell element.
- the adhesive layer is a layer that is placed between the support and the sealant layer (body portion).
- the adhesive layer is used for adhering the support and the encapsulant layer, as well as adhering the support-like solar cell element and the encapsulant layer.
- the adhesive layer covers the entire solar cell element, it also has a function of sealing the solar cell element.
- the material of the adhesive is not particularly limited and can be appropriately selected according to the purpose. For example, cured products of acrylic resins and epoxy resins can be used.
- Any known material can be used as the cured acrylic resin, as long as it is a cured monomer or oligomer having an acrylic group in the molecule. Any known material can be used as long as it is a cured monomer or oligomer having a group.
- Epoxy resins include water-dispersed, solvent-free, solid, heat-curing, curing agent mixed, and ultraviolet-curing types. Among these, heat-curing and ultraviolet-curing types are preferred, and ultraviolet-curing types are more preferred. preferable. It should be noted that it is possible to perform heating even in the case of an ultraviolet curing type, and it is preferable to perform heating even after ultraviolet curing.
- Specific examples of epoxy resins include bisphenol A type, bisphenol F type, novolac type, cycloaliphatic type, long-chain aliphatic type, glycidylamine type, glycidyl ether type, glycidyl ester type, and the like. may be used together, or two or more of them may be used in combination.
- Epoxy resin compositions that are already commercially available can be used in the present invention.
- epoxy resin compositions that have been developed and marketed for use in solar cells and organic EL devices, and can be used particularly effectively in the present invention.
- Commercially available epoxy resin compositions include, for example, TB3118, TB3114, TB3124, TB3125F (manufactured by Three Bond Co., Ltd.), World Rock 5910, World Rock 5920, World Rock 8723 (manufactured by Kyoritsu Chemical Sangyo Co., Ltd.), WB90US (P) ( manufactured by MORESCO Corporation) and the like.
- the curing agent is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include amine-based, acid anhydride-based, polyamide-based and other curing agents.
- Amine curing agents include aliphatic polyamines such as diethylenetriamine and triethylenetetramine, and aromatic polyamines such as metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenylsulfone.
- Acid anhydride curing agents include phthalic anhydride.
- curing agents include imidazoles and polymercaptans. These may be used alone or in combination of two or more.
- the additive is not particularly limited and can be appropriately selected according to the purpose. , plasticizers, coloring agents, flame retardant aids, antioxidants, organic solvents, and the like. Among these, fillers, gap agents, curing accelerators, polymerization initiators, and desiccants (hygroscopic agents) are preferred, and fillers and polymerization initiators are more preferred.
- a filler as an additive, it suppresses the infiltration of moisture and oxygen, further reduces volume shrinkage during curing, reduces outgassing during curing or heating, improves mechanical strength, and thermal conductivity and the control of fluidity can be obtained. Therefore, including a filler as an additive is very effective in maintaining stable output in various environments. Additives may be added to the sealant layer or the sealing portion.
- the output characteristics and durability of the solar cell element not only the effects of intruding moisture and oxygen but also the effects of outgassing generated during curing or heating of the sealing member cannot be ignored.
- the effect of outgassing generated during heating has a large effect on output characteristics in high-temperature environment storage.
- fillers, gap agents, and drying agents in the adhesive layer, the sealant layer, and the sealing part these themselves can suppress the infiltration of moisture and oxygen, and the amount of adhesive and sealant used can be reduced, it is possible to obtain the effect of reducing outgassing.
- Incorporating a filler, a gap agent, or a desiccant into the adhesive layer, the sealant layer, and the sealing portion is effective not only during curing but also during storage of the solar cell element in a high-temperature environment.
- the filler is not particularly limited and can be appropriately selected depending on the purpose. Examples include crystalline or amorphous silica, silicate minerals such as talc, alumina, aluminum nitride, silicon nitride, calcium silicate, Examples include inorganic fillers such as calcium carbonate. Among these, hydrotalcite is particularly preferred. Moreover, these may be used alone or in combination of two or more.
- the average primary particle size of the filler is preferably 0.1 ⁇ m or more and 10 ⁇ m or less, more preferably 1 ⁇ m or more and 5 ⁇ m or less.
- the average primary particle size of the filler is within the above preferable range, the effect of suppressing the penetration of moisture and oxygen can be sufficiently obtained, the viscosity becomes appropriate, and the adhesion to the substrate and defoaming properties are improved. It is also effective for controlling the width of the sealing portion and for workability.
- the content of the filler is preferably 10 parts by mass or more and 90 parts by mass or less, more preferably 20 parts by mass or more and 70 parts by mass or less with respect to the entire adhesive layer (100 parts by mass).
- the content of the filler is within the above preferable range, the effect of suppressing penetration of moisture and oxygen is sufficiently obtained, the viscosity becomes appropriate, and the adhesion and workability become good.
- Gap agents are also called gap control agents or spacer agents.
- the gap material As an additive, it becomes possible to control the gap of the sealing portion. For example, when an adhesive layer is applied on the first substrate or the first electrode, and the second substrate is placed on top of it for sealing, the adhesive layer or the sealing material layer does not absorb the gap agent. By mixing, the gap of the sealing portion is made uniform in size of the gap agent, so that the gap of the sealing portion can be easily controlled.
- the gap agent is not particularly limited as long as it is granular, has a uniform particle size, and has high solvent resistance and heat resistance, and can be appropriately selected according to the purpose. As the gap agent, one having a high affinity with the epoxy resin and having a spherical particle shape is preferable.
- the particle diameter of the gap agent can be selected according to the gap of the sealing portion to be set, but is preferably 1 ⁇ m or more and 100 ⁇ m or less, more preferably 5 ⁇ m or more and 50 ⁇ m or less.
- the polymerization initiator is not particularly limited as long as it initiates polymerization using heat or light, and can be appropriately selected according to the purpose. Examples include thermal polymerization initiators and photopolymerization initiators. be done. Thermal polymerization initiators are compounds that generate active species such as radicals and cations by heating, and azo compounds such as 2,2'-azobisbutyronitrile (AIBN) and benzoyl peroxide (BPO) Examples include peroxides. A benzenesulfonic acid ester, an alkylsulfonium salt, or the like is used as the thermal cationic polymerization initiator.
- thermal polymerization initiators are compounds that generate active species such as radicals and cations by heating, and azo compounds such as 2,2'-azobisbutyronitrile (AIBN) and benzoyl peroxide (BPO) Examples include peroxides. A benzenesulfonic acid ester, an alkylsulfonium salt, or the like is used as the
- a photocationic polymerization initiator is preferably used in the case of an epoxy resin.
- a photocationic polymerization initiator is mixed with an epoxy resin and irradiated with light, the photocationic polymerization initiator decomposes to generate acid, which causes the epoxy resin to polymerize and the curing reaction proceeds.
- Photocationic polymerization initiators have effects such as little volume shrinkage during curing, no oxygen inhibition, and high storage stability.
- photocationic polymerization initiators include aromatic diazonium salts, aromatic iodonium salts, aromatic sulfonium salts, metacelone compounds, and silanol/aluminum complexes.
- a photoacid generator having a function of generating an acid upon irradiation with light can also be used.
- the photoacid generator acts as an acid that initiates cationic polymerization, and includes ionic sulfonium salt-based and iodonium salt-based onium salts composed of a cationic part and an anionic part. These may be used alone or in combination of two or more.
- the amount of the polymerization initiator added may vary depending on the material used, but is preferably 0.5 parts by mass or more and 10 parts by mass or less, and 1 part by mass or more and 5 parts by mass with respect to the entire sealing member (100 parts by mass). Part or less is more preferable.
- the amount of addition is within the above preferred range, curing proceeds appropriately, the amount of uncured material remaining can be reduced, and excessive outgassing can be prevented.
- a desiccant (also called a moisture absorber) is a material that has the function of physically or chemically absorbing moisture. can be reduced.
- the desiccant is not particularly limited and can be appropriately selected depending on the purpose. Examples include inorganic water-absorbing materials such as silica gel, molecular sieves, and zeolites. Among these, zeolite is preferable because it absorbs a large amount of moisture. These may be used alone or in combination of two or more.
- Curing accelerators are materials that increase the curing rate and are mainly used in thermosetting epoxy resins.
- the curing accelerator is not particularly limited and can be appropriately selected depending on the purpose.
- tertiary amines or tertiary amine salts such as diazabicyclo(4,3,0)-nonene-5
- imidazoles such as 1-cyanoethyl-2-ethyl-4-methylimidazole and 2-ethyl-4-methylimidazole
- Phosphines such as triphenylphosphine and tetraphenylphosphonium/tetraphenylborate
- phosphonium salts are included. These may be used alone or in combination of two or more.
- the coupling agent is not particularly limited as long as it is a material that has the effect of increasing the molecular bond strength, and can be appropriately selected according to the purpose.
- Examples thereof include silane coupling agents. Specifically, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, N-phenyl- ⁇ -aminopropyltrimethoxysilane, N-(2-aminoethyl)3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)3-aminopropylmethyltrimethoxysilane, 3-aminopropyltrimethoxysilane Silane cups such as ethoxysilane, 3-mercaptopropyltrimethoxysilane, vinyltri
- a sheet adhesive can be used in the present invention.
- the sheet adhesive is a sheet on which a resin layer is formed in advance, and the sheet can be made of glass or a film having a high gas barrier property. Alternatively, the sheet may be formed only of resin. It is also possible to stick a sheet-like adhesive onto the sealing film. It is also possible to form a structure in which a hollow portion is provided on the sealing film and then bond it to the device.
- the distance (d1) between the edge of the solar cell element and the edge of the adhesive layer is preferably 0.5 mm or more and 2 cm or less.
- the edge of the solar cell element means the outer part of the solar cell element. For example, if the solar cell element is square, the edges of the square constitute the ends of the solar cell element.
- the edge of the adhesive layer means the outermost edge of the adhesive layer.
- d1 means the closest distance between the edge of the solar cell element and the end of the adhesive layer (the edge on the side opposite to the solar cell element).
- d1 is preferably 1 mm or more, preferably 2 mm or more. However, d1 may be appropriately adjusted according to the size of the solar cell element. When the solar cell element is a square and the length of the long side is l, d1 may be 0.01 l or more and 0.5 l or less, or 0.05 l or more and 0.2 l or less. may be
- the encapsulant layer (body portion) is formed to cover the adhesive layer and means a layer for preventing water or the like from entering the solar cell element. In this specification, it is described as a sealant layer or a main body part in order to distinguish it from the sealing part.
- the encapsulant layer preferably covers the solar cell element and the adhesive layer.
- the sealant layer is arranged to face the support so as to sandwich the solar cell element including the photoelectric conversion layer and the electrodes.
- the sealant layer may be composed of a sealant film.
- the shape, structure, size and type (material) of the sealant layer are not particularly limited and can be appropriately selected according to the purpose.
- the sealant layer may be thin or film-like.
- the material that constitutes the sealant layer may be the same as that of the adhesive layer.
- Another example of the material for the sealant layer is the one in which a barrier layer is formed on the surface of the resin base material to prevent the passage of moisture and oxygen, and the barrier layer is formed on one or both sides of the base material.
- the material of the resin substrate is not particularly limited, but for example, polyolefin resins such as homopolymers or copolymers such as ethylene, propylene and butene; amorphous polyolefin resins such as cyclic polyolefin; Polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyamide resins such as nylon 6, nylon 66, nylon 12 and copolymerized nylon; ethylene-vinyl acetate copolymer partial hydrolyzate (EVOH) , polyimide resins, polyetherimide resins, polysulfone resins, polyether sulfone resins, polyether ether ketone resins, polycarbonate resins, polyvinyl butyral resins, polyarylate resins, fluorine resins, acrylic resins, A decomposable resin and the like are included.
- polyolefin resins such as homopolymers or copolymers such as ethylene, propylene
- polyester resins are preferred, and polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are particularly preferred.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- the resin base material may be made of one kind of resin material, or may be made of two or more kinds of resin materials.
- the resin base material may contain other materials such as inorganic fillers in order to improve the durability of the solar cell module.
- the inorganic filler is not particularly limited, but examples include silica, mica, talc, clay, bentonite, montmorillonite, kaolinite, wollastonite, calcium carbonate, titanium oxide, alumina, barium sulfate, potassium titanate, glass fiber, etc. is mentioned.
- one type of inorganic filler may be mixed in the resin base material, or two or more types may be used.
- the barrier layer is mainly composed of metal oxides, metals, mixtures of polymers and metal alkoxides, and examples thereof include aluminum oxide, silicon oxide, and aluminum.
- Metal alkoxides include tetraethoxysilane, triisopropoxyaluminum, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanate Propyltriethoxysilane and the like can be mentioned.
- the barrier layer may be transparent or opaque. Moreover, the barrier layer may be a single layer formed by combining the above materials, or may be a layered structure of a plurality of layers. Known methods can be used to form the barrier layer, and coating methods such as vacuum film formation such as sputtering, dipping, roll coating, screen printing, spraying, and gravure printing can be used. can.
- the thickness of the sealing agent layer main body may be within the range generally used in this technology. For example, it can be appropriately set within the range of 0.05 to 1 mm.
- the sealant layer preferably covers the entire adhesive layer. Furthermore, the sealant layer is preferably made larger than the adhesive layer in order to prevent water and oxygen from entering.
- the distance (d2) between the edge of the adhesive layer and the edge of the sealant layer is preferably 0.2 mm or more and 1 cm or less.
- the ends of the adhesive layer are as previously described.
- the edge of the encapsulant layer means the outermost edge of the encapsulant layer.
- the distance between the edge of the adhesive layer and the edge of the sealant layer means the distance that minimizes the distance between the edge of the adhesive layer and the edge of the sealant layer.
- d2 is preferably 0.5 mm or more, more preferably 1 mm or more.
- the upper limit varies depending on the size and application of the solar cell, but if it is too large, the solar cell (device) itself will be too large, and the parts other than the solar cell element will be too large and wasteful. is preferred, 5 mm or less is preferred, and 4 mm or less is more preferred.
- the sealing portions 15, 25, and 35 are portions provided in the end regions of the sealant layer to cover the end regions.
- the edge region of the encapsulant layer means the outer peripheral portion of the encapsulant layer.
- the sealing portion is a portion provided to more firmly shield the outer peripheral portion of the sealant layer from water and oxygen.
- the encapsulant is constructed separately from the encapsulant layer.
- the material of the sealant the same material as the sealant layer may be used, or the same material as the adhesive may be used.
- the shape of the sealing portion is not particularly limited. An example of the shape of the sealing portion is that which is installed so as to cover the contact point between the end portion of the sealing agent layer and the support.
- a known method such as coating can be used depending on the material.
- the sealing portion overlaps and protrudes from the upper portion of the sealing agent layer, and the sealing portion may be as large as possible in order to prevent moisture and oxygen from entering.
- the width of the sealing portion (the distance from the center of the solar cell element toward the outside) is preferably 2 mm or more, more preferably 3 mm or more. Also, it may be 3 cm or less, 2 cm or less, 1.5 cm or less, or 5 mm or less.
- the distance (d3) between the end of the sealant layer and the end of the sealing portion is preferably 0.5 mm or more and 1.5 cm or less.
- the ends of the sealant layer are as previously described.
- the end portion of the sealing portion means an edge portion of the sealing portion on the outer side (the side opposite to the solar cell element side).
- the distance between the edge of the sealing agent layer and the edge of the sealing portion means the closest distance between the edge of the sealing agent layer and the edge of the sealing portion.
- d3 is preferably 1 mm or more, more preferably 1.5 mm or more, so as to prevent moisture and oxygen from entering, and to adhere tightly to the sealant body and prevent peeling.
- the solar cell (device) becomes too large, or if the portion other than the solar cell element becomes too large, it may cause waste. .
- the sealing portion opaque, because it is easy to distinguish from the sealing agent layer (main body portion).
- the method of making opaque in this way is not particularly limited, but includes a method of containing a filler that can be used in the adhesive layer or the sealant layer (main body), or a known pigment or dye. be done.
- the cross-sectional shape of the sealing portion is rounded.
- the cross-sectional shape of the sealing portion may be a flat shape parallel to the support.
- the thickness of the sealing portion may be equal to or less than the thickness of the sealing agent layer.
- a glass substrate with ITO 25 mm ⁇ 24.5 mm, Geomatec was soaked in 2-propanol, acetone, Semico Clean 56 (display cleaning liquid, product name, product of Furuuchi Chemical Co., Ltd.), water, and 2-propanol in that order for 15 minutes each. Ultrasonic cleaning and then plasma treatment were performed.
- 300 ⁇ L of a water-soluble SnO 2 colloidal solution (15% SnO 2 colloidal solution diluted 1:1 with pure water and passed through a PTFE filter) was dropped onto the substrate and spin-coated (3000 rpm, 20 seconds), and dried by heating at 150° C. for 30 minutes.
- This substrate was moved to a glove box, and CsI, MABr (methylammonium bromide, CH5N.HBr), PbBr 2 , PbI 2 , FAI (formamidine hydroiodide, CH4N2.HI) was added as a perovskite precursor solution. , and a mixed solvent of DMF and DMSO (volume ratio 10:3) to prepare a solution with a concentration of 1.05M. After filtering this solution using a PTFE filter, apply 190 ⁇ L onto the above substrate on which the electron transport layer is formed, spin coat (1000 rpm for 10 seconds with a slope of 1 second, and 3000 rpm for 20 seconds with a slope of 5 seconds).
- a one-liquid type epoxy adhesive (Nagase Chemtex UV Resin XNR5516Z-B1) was applied to the outer periphery of this film by screen printing, and cured by UV irradiation to form a sealing portion, as shown in Fig. 1.
- a solar cell device was fabricated. The width of the sealing portion was 3.3 mm (same width in length and width), d1 was 2.0 mm, d2 was 0.3 mm, and d3 was 1.0 mm.
- the solar cell characteristics of this solar cell device were measured using a solar simulator (SM-250PV manufactured by Spectroscopy Instruments Co., Ltd., light intensity: 100 mW/cm 2 ).
- a solar cell device was produced in the same manner as in Example 1, except that the sealing resin was not provided on the outer periphery of the film, and the solar cell characteristics were evaluated. As a result, an open-circuit voltage of 1.10 V, a short-circuit current density of 22.0 mA/cm 2 , a form factor of 0.72, and a conversion efficiency of 17.4% were confirmed. Next, a durability test was performed in a constant temperature and high humidity chamber in the same manner as in Example 1, and when the retention rate after 500 hours was measured, the result was 42%. It was clear that
- first layer an adhesive layer having the same size as the part where the element was formed on the perovskite solar cell element in Example 1
- the upper part was covered with a sealant layer (first layer)
- An adhesive layer was formed so as to cover the entire top again with the same adhesive (second layer), and the upper portion was further covered with the same sealing agent layer as the first layer (second layer).
- a sealing material was applied to the outer periphery of the second layer and cured in the same manner as in Example 1 to fabricate a solar cell device as shown in FIG.
- the width of the sealing portion was 3.4 mm (same width in length and width), and d1 was 1.9 mm, d2 was 0.4 mm, and d3 was 1.1 mm.
- an adhesive layer (first layer) having the same size as the part where the element was formed and an encapsulant layer (first layer) were formed thereon, and was again covered with the same adhesive (second layer), and the upper portion was further covered with the same sealant layer as the first layer (second layer).
- a sealing material was applied to the outer periphery of the film of the second layer and cured to produce a solar cell device as shown in FIG.
- the width of the sealing portion was 3.9 mm (same width in length and width), d1 was 2.0 mm, d2 was 0.7 mm, and d3 was 1.2 mm.
- a solar cell device was produced in the same manner as in Example 2, except that the sealing resin was not provided on the outer periphery of the film, and the solar cell characteristics were evaluated. As a result, an open-circuit voltage of 1.09 V, a short-circuit current density of 22.0 mA/cm 2 , a form factor of 0.72, and a conversion efficiency of 17.3%, which are equivalent to those of Example 2, were confirmed. Next, a durability test was conducted in a constant temperature and high humidity chamber in the same manner as in Example 1, and when the retention rate after 500 hours was measured, the result was 51%. It was clear that [Experimental example 3]
- a solar cell device was produced in the same manner as in Example 3, except that the sealing resin was not provided on the outer periphery of the film, and the solar cell characteristics were evaluated. As a result, an open-circuit voltage of 1.10 V, a short-circuit current density of 22.0 mA/cm 2 , a form factor of 0.71, and a conversion efficiency of 17.2% were confirmed. Next, a durability test was conducted in a constant temperature and high humidity chamber in the same manner as in Example 1, and when the retention rate after 500 hours was measured, the result was 48%. It was clear that
- a solar cell was manufactured in the same manner as in Example 1, except that carbon black was mixed in the sealing portion.
- the sealing part became black, and the sealing part was formed, and it was possible to firmly grasp the state of covering the end of the sealing layer without gaps.
- This invention can be used in fields such as solar cells.
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Abstract
Description
そして,太陽電池素子は,電極と,ペロブスカイト化合物を含む光電変換層と,裏面電極と,をこの順に含む。
最初の発明は,太陽電池に関する。図1,図3,及び図4は,太陽電池の断面図を,図2は図1に示した太陽電池を上方から見た図を示す概念図である。図1~図4に示されるように,この太陽電池1,2,3は,第1の支持体11,21,31と,(ペロブスカイト)太陽電池素子12,22,32と,接着剤層13,23,33と,接着剤層全体を覆う封止剤層(本体部)14,24,34と,封止部15,25,35を有する。
支持体11,21,31として,有機系太陽電池や有機EL素子における公知の基板を適宜用いることができる。基板の例は,ガラス,プラスティック板,プラスティック膜,無機結晶体などが挙げられる。また,これらの表面の一部又は全部の上に,金属膜,半導体膜,導電性膜及び絶縁性膜の少なくとも1種の膜が形成されている基板も好適に用いることができる。特に,薄型化,軽量化のため,支持体は,可撓性基板(フレキシブル基板)であるのが好ましい。
太陽電池素子は,太陽光などの光を受けて発電する機能を有する素子を意味する。太陽電池素子は,電子輸送層とホール輸送層でペロブスカイト層(光吸収層・光電変換層)を挟んだ形状を有するものが好ましい。ペロブスカイト層は,有機無機ハイブリッド化合物からなるペロブスカイト層が好ましい。図5に示されるように,透明電極40側から電子輸送層46,ペロブスカイト層47,正孔(ホール)輸送層48,裏面電極49が形成された順型構造でもよい。また,図6に示されるように,透明電極50側から正孔輸送層58,ペロブスカイト層57,電子輸送層56,裏面電極59が形成された逆型構造の何れであっても構わない。
電極は,光を透過させるため透明電極であることが好ましい。透明電極は,電子輸送層の支持体であるとともに,ペロブスカイト層(光吸収層・光電変換層)より電子を取り出す機能を有する層である。電極は,支持体11,21,31上に形成される。透明電極は,導電体から形成されており,具体例としては,スズドープ酸化インジウム(ITO)膜,不純物ドープの酸化インジウム(In2O3)膜,不純物ドープの酸化亜鉛(ZnO)膜,フッ素ドープ二酸化スズ(FTO)膜,これらを積層してなる積層膜,金,銀,銅,アルミニウム,タングステン,チタン,クロム,ニッケル,コバルトなどが挙げられる。これらは単独でも2種類以上の混合であっても,また,単層でも積層であっても構わない。これらの膜は,例えば拡散防止層として機能するものであってもよい。これら電極の厚みは特に制限されず,通常,シート抵抗が5~15Ω/□(単位面積当たり)となるように調整することが好ましい。電極は,形成する材料に応じ,公知の成膜方法により得ることができる。また,これらの電極は,膜状であっても,メッシュ状のような格子状に形成されていても構わない。支持体上に電極を形成する方法は公知のものを用い,真空蒸着やスパッタリング等の真空製膜が好ましい。また透明電極は,パターニングされたものを用いてもよく,その方法としてはレーザーやエッチング液に浸す方法,真空製膜時にマスクを用いてパターニングする方法が挙げられ,本発明においては何れの方法であっても構わない。
電子輸送層46,56は,電子輸送性の半導体が好ましく,チタン,スズ,亜鉛,鉄,タングステン,ジルコニウム,インジウム,セリウム,イットリウム,アルミニウム,マグネシウム,バナジウム,ニオブの酸化物,カドミウム,亜鉛,鉛,銀,アンチモン,ビスマスの硫化物,カドミウム,鉛のセレン化物,カドミウムのテルル化物等の金属カルコゲニドが挙げられ,これらの中でも酸化物が特に好ましい。その中でも,特に酸化亜鉛,酸化スズ,酸化チタンが特に好ましい。電子輸送層は単層であっても多層であってもよく,多層の場合,粒径の異なる半導体微粒子が多層塗布された多孔質形状であっても構わない。多孔質形状の場合,半導体微粒子の粒径は3~100nmが好ましく,5~70nmがより好ましい。膜厚は5~1000nmが好ましく,10~500nmがより好ましい。
正孔輸送層48,58は,電荷を輸送する機能を有する層である。正孔輸送層には,例えば,導電体,半導体,有機正孔輸送材料等を用いることができる。当該材料は,ペロブスカイト層(光吸収層)から正孔を受け取り,正孔を輸送する正孔輸送材料として,機能し得る。当該導電体及び半導体としては,例えば,CuI,CuInSe2,CuS等の1価銅を含む化合物半導体;GaP,NiO,CoO,FeO,Bi2O3,MoO2,Cr2O3等の銅以外の金属を含む化合物が挙げられる。なかでも,より効率的に正孔のみを受け取り,より高い正孔移動度を得る観点から,1価銅を含む半導体が好ましく,CuIがより好ましい。有機正孔輸送材料としては,例えば,ポリ-3-ヘキシルチオフェン(P3HT),ポリエチレンジオキシチオフェン(PEDOT)等のポリチオフェン誘導体;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)等のフルオレン誘導体;ポリビニルカルバゾール等のカルバゾール誘導体;ポリ[ビス(4-フェニル)(2,4,6-トリメチルフェニル)アミン](PTAA)等のトリフェニルアミン誘導体;ジフェニルアミン誘導体;ポリシラン誘導体;ポリアニリン誘導体等が挙げられる。なかでも,より効率的に正孔のみを受け取り,より高い正孔移動度を得る観点から,トリフェニルアミン誘導体,フルオレン誘導体等が好ましく,PTAA,Spiro-OMeTADなどがより好ましい。
ペロブスカイト層(光吸収層・光電変換層)47,57は,光を吸収し,励起された電子と正孔を移動させることにより,光電変換を行う層である。本発明におけるペロブスカイト化合物は有機化合物と無機化合物の複合物質であることが好ましい。ペロブスカイト化合物は,ハロゲン化金属からなる層と有機カチオン分子が並んだ層が交互に積層した層状ペロブスカイト型構造を示すことが好ましく,以下の一般式(1)にて表わされる。
XαYβMγ ・・・一般式(1)
上記一般式(1)において,Xはハロゲン原子,Yはアルキルアミン化合物,Mは鉛,スズ,インジウム,アンチモン,ビスマスから選ばれた少なくとも1種以上の金属イオンを表し,α:β:γの比率が3:1:1であり,β及びγは1より大きい整数を表わす。Xは塩素,臭素,ヨウ素などのハロゲン原子を挙げることができ,これらは単独または混合物として用いることができる。Yはメチルアミン,エチルアミン,n-ブチルアミン,ホルムアミジン等のアルキルアミン化合物を挙げることができる。
裏面電極49,59としては,例えば,白金,金,銀,銅,アルミニウム,ロジウム,ニッケル,コバルト,鉄,パラジウム,インジウム等の金属,グラファイト,グラフェン,カーボンナノチューブ等の炭素系化合物,ITO,インジウムドープ酸化亜鉛(IZO),アンチモンドープ酸化スズ(ATO)等の導電性金属酸化物又はポリチオフェン若しくはポリアニリン等の導電性高分子等が挙げられ,これらは単独あるいは2種以上の混合であっても構わない。裏面電極は,透明電極であってもよい。裏面電極の膜厚は特に限定されるものではなく,上述の材料の単独膜または2種以上を混合あるいは積層膜であっても良い。裏面電極は,用いられる材料の種類や正孔輸送層の種類により,適宜正孔輸送層上に塗布,ラミネート,真空蒸着,CVD,貼り合わせなどの方法を用いることにより形成可能である。
接着剤層は,太陽電池素子を覆う層である。接着剤層は,太陽電池素子の全体を覆ってもよいし,太陽電池素子の一部を覆ってもよい。接着剤層は,支持体と封止剤層(本体部)の間に配置される層である。接着剤層は,支持体と封止剤層を接着するほか,支持体状の太陽電池素子と封止剤層とを接着するために用いられる。もっとも,接着剤層が,太陽電池素子の全体を覆う場合,太陽電池素子を封止する機能も有する。接着剤の材質としては特に制限はなく,目的に応じて適宜選択することが可能である。例えば,アクリル樹脂やエポキシ樹脂の硬化物などが挙げられる。
アクリル樹脂の硬化物は,分子内にアクリル基を有するモノマーあるいはオリゴマーが硬化したものであれば,公知のいずれの材料でも使用することが可能であり,エポキシ樹脂の硬化物は,分子内にエポキシ基を有するモノマーあるいはオリゴマーが硬化したものであれば,公知のいずれの材料でも使用することが可能である。
ギャップ剤としては,粒状でかつ粒径が均一であり,耐溶剤性や耐熱性が高いものであれば特に制限はなく,目的に応じて適宜選択することができる。ギャップ剤としては,エポキシ樹脂と親和性が高く,粒子形状が球形であるものが好ましい。具体的には,ガラスビーズ,シリカ微粒子,有機樹脂微粒子などが好ましい。これらは,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。
ギャップ剤の粒径としては,設定する封止部のギャップに合わせて選択可能であるが,1μm以上100μm以下が好ましく,5μm以上50μm以下がより好ましい。
熱重合開始剤は,加熱によってラジカルやカチオンなどの活性種を発生する化合物であり,2,2’-アゾビスブチロニトリル(AIBN)のようなアゾ化合物や,過酸化ベンゾイル(BPO)などの過酸化物などが挙げられる。熱カチオン重合開始剤としては,ベンゼンスルホン酸エステルやアルキルスルホニウム塩等が用いられる。
一方,光重合開始剤は,エポキシ樹脂の場合,光カチオン重合開始剤が好ましく用いられる。エポキシ樹脂に光カチオン重合開始剤を混合し,光照射を行うと,光カチオン重合開始剤が分解して,酸が発生し,酸がエポキシ樹脂の重合を引き起こし,硬化反応が進行する。光カチオン重合開始剤は,硬化時の体積収縮が少なく,酸素阻害を受けず,貯蔵安定性が高いといった効果を有する。
乾燥剤としては,特に制限はなく,目的に応じて適宜選択することができるが,粒子状であるものが好ましく,例えば,酸化カルシウム,酸化バリウム,酸化マグネシウム,硫酸マグネシウム,硫酸ナトリウム,塩化カルシウム,シリカゲル,モレキュラーシーブ,ゼオライトなどの無機吸水材料が挙げられる。これらの中でも,吸湿量が多いゼオライトが好ましい。これらは,単独で使用しても,2種以上の併用であってもよい。
硬化促進剤としては,特に制限はなく,目的に応じて適宜選択することができ,例えば,DBU(1,8-ジアザビシクロ(5,4,0)-ウンデセン-7)やDBN(1,5-ジアザビシクロ(4,3,0)-ノネン-5)等の三級アミンあるいは三級アミン塩,1-シアノエチル-2-エチル-4-メチルイミダゾールや2-エチル-4-メチルイミ
ダゾール等のイミダゾール系,トリフェニルホスフィンやテトラフェニルホスホニウム・テトラフェニルボレート等のホスフィンあるいはホスホニウム塩などが挙げられる。これらは,単独で使用しても,2種以上の併用であってもよい。
シート状接着剤とは,シート上に予め樹脂層を形成したもので,シートにはガラスやガスバリア性の高いフィルム等を用いることができる。また,樹脂のみでシートを形成していてもよい。シート状接着剤を,封止フィルム上に貼り付けることも可能である。封止フィルム上に,中空部を設けた構造にしてからデバイスと貼り合せることも可能である。
封止剤層(本体部)は,接着剤層を覆うように形成され,太陽電池素子に水などが侵入することを防止するための層を意味する。封止部と区別する意味で,この明細書では封止剤層や本体部と表記している。封止剤層は,太陽電池素子及び接着剤層を覆うものが好ましい。封止剤層は,例えば,光電変換層と電極を含む太陽電池素子を挟むように支持体と対向して配置される。封止剤層は封止剤フィルムにより構成されていてもよい。 封止剤層は,その形状,構造,大きさ,種類(材質)については,特に制限はなく,目的に応じて適宜選択することができる。封止剤層は薄膜状,又はフィルム状であってもよい。
接着剤層の端部と,封止剤層の端部との距離(d2)が,0.2mm以上1cm以下であることが好ましい。接着剤層の端部は先に説明した通りである。封止剤層の端部は,封止剤層のうち最も外側の縁部を意味する。接着剤層の端部と,封止剤層の端部との距離とは,接着剤層の端部と封止剤層の端部との距離が最も小さくなる距離を意味する。d2は,0.5mm以上が好ましく,1mm以上がより好ましい。また,太陽電池の大きさや用途によって,上限は異なるが,あまり大きすぎても太陽電池(デバイス)自体が大きくなりすぎたり,太陽電池素子以外の部分が大きくなりすぎて無駄になるので,1cm以下が好ましく,5mm以下が好ましく,4mm以下がより好ましい。
封止部15,25,35は,封止剤層の端部領域に設けられ,端部領域を覆う部位である。封止剤層の端部領域は,封止剤層の外縁部分を意味する。封止部は,封止剤層の外周部を水や酸素からより強固に遮断するために設ける部分である。封止部は,封止剤層とは別個に構成される。封止剤の材質としては,封止剤層と同一のものを用いてもよく,接着剤と同一のものを用いてもよい。封止部の形状は,特に限定されない。封止部の形状の例は,封止剤層の端部と,支持体との接触点を覆うように設置されるものである。封止部の形成方法は,材質によって,塗布など,既知の方法を用いることができる。
なお,断面図では,封止部の断面形状が,丸みを帯びている。しかし,封止部の断面形状は,支持体と平行なフラット形状でも構わない。封止部の厚みは封止剤層の厚み以下でも構わない。
この太陽電池デバイスを,ソーラーシミュレーター(分光計器社製SM-250PV,光量:100mW/cm2)を用いて,太陽電池特性を測定した。その結果,開放電圧1.10V,短絡電流密度22.1mA/cm2,形状因子0.72,変換効率17.5%を得ることができた。
次に,この太陽電池デバイスを,60℃,90%RHの恒温恒湿試験器に入れて,耐久性試験を行った。500時間後の初期特性に対する維持率は91%であった。
[実験例1]
この第二層の外周部に,実施例1と同様にして封止材を塗布,硬化して図3に示されるような太陽電池デバイスを作製した。
封止部の幅は3.4mm(縦横同幅)であり,d1が1.9mm,d2が0.4mm,d3が1.1mmであった。
このデバイスの太陽電池特性を測定したところ,開放電圧1.09V,短絡電流密度22.2mA/cm2,形状因子0.72,変換効率17.4%を得ることができた。次に,実施例1と同様にして恒温高湿器での耐久性試験を行い,500時間後の維持率を測定したところ,92%という結果であり,本発明のデバイス構造が耐久性に優れていることが明らかであった。
この第二層のフィルム外周部に,実施例1と同様にして封止材を塗布,硬化して図4に示されるような太陽電池デバイスを作製した。
封止部の幅は3.9mm(縦横同幅)であり,d1が2.0mm,d2が0.7mm,d3が1.2mmであった。
このデバイスの太陽電池特性を測定したところ,開放電圧1.09V,短絡電流密度22.1mA/cm2,形状因子0.72,変換効率17.3%を得ることができた。次に,実施例1と同様にして恒温高湿器での耐久性試験を行い,500時間後の維持率を測定したところ,93%という結果であり,本発明のデバイス構造が耐久性に優れていることが明らかであった。
[実験例2]
[実験例3]
4,5 ペロブスカイト太陽電池素子
11,21,31,61,71,81 支持体
12,22,32,62,72,82 ペロブスカイト太陽電池素子
13,23,33,63,73,83 接着剤層
14,24,34,64,74,84 封止剤層
15,25,35 封止部
40,50 透明電極
46,56 電子輸送層
47,57 光電変換層(ペロブスカイト層)
48,58 正孔輸送層
49,59 裏面電極
Claims (5)
- 支持体と,
前記支持体上に設けられた太陽電池素子と,
前記太陽電池素子を覆う接着剤層と,
前記接着剤層を覆う封止剤層と,
前記封止剤層の端部領域に設けられ,前記端部領域を覆う封止部と,を含み,
前記太陽電池素子は,
電極と,
ペロブスカイト化合物を含む光電変換層と,
裏面電極と,をこの順に含む,
太陽電池。 - 請求項1に記載の太陽電池であって,
前記太陽電池素子の端部と,前記接着剤層の端部との距離(d1)が,0.5mm以上2cm以下である,太陽電池。 - 請求項1に記載の太陽電池であって,
前記接着剤層の端部と,前記封止剤層のうち前記接着剤層を覆う部分の端部との距離(d2)が,0.2mm以上1cm以下である,太陽電池。 - 請求項1に記載の太陽電池であって,
前記封止剤層の端部と,前記封止部の端部との距離(d3)が,0.5mm以上1.5cm以下である,太陽電池。 - 請求項1に記載の太陽電池であって,
前記封止部は,不透明である,太陽電池。
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| EP22867175.6A EP4401528A4 (en) | 2021-09-07 | 2022-08-22 | PEROVSKITE SOLAR CELL |
| US18/579,372 US20240349524A1 (en) | 2021-09-07 | 2022-08-22 | Perovskite solar cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024211896A3 (en) * | 2023-04-07 | 2025-04-03 | Alliance For Sustainable Energy, Llc | Bilayer electrodes for perovskite solar cells |
| WO2025148538A1 (zh) * | 2024-01-08 | 2025-07-17 | 西安天交新能源有限公司 | 一种钙钛矿太阳能电池组件的封装结构及其应用 |
| WO2025197889A1 (ja) * | 2024-03-22 | 2025-09-25 | マクセル株式会社 | ボタン形電池 |
| WO2025241459A1 (zh) * | 2024-05-24 | 2025-11-27 | 西安天交新能源有限公司 | 一种钙钛矿光伏组件及其制备方法和应用 |
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| WO2025062932A1 (ja) * | 2023-09-22 | 2025-03-27 | 富士フイルム株式会社 | 太陽電池の製造方法 |
| JP2026003986A (ja) * | 2024-06-25 | 2026-01-14 | 株式会社アイシン | 太陽電池モジュール |
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