WO2015064688A1 - Composition encapsulante à conversion de longueur d'onde, couche encapsulante à conversion de longueur d'onde, et module de pile solaire - Google Patents

Composition encapsulante à conversion de longueur d'onde, couche encapsulante à conversion de longueur d'onde, et module de pile solaire Download PDF

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WO2015064688A1
WO2015064688A1 PCT/JP2014/078895 JP2014078895W WO2015064688A1 WO 2015064688 A1 WO2015064688 A1 WO 2015064688A1 JP 2014078895 W JP2014078895 W JP 2014078895W WO 2015064688 A1 WO2015064688 A1 WO 2015064688A1
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wavelength
solar cell
light
sealing material
wavelength conversion
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PCT/JP2014/078895
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English (en)
Japanese (ja)
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正孝 上田
久成 尾之内
達也 北原
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日東電工株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/055—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • 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
    • Y02E10/52—PV systems with concentrators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/542—Dye sensitized solar cells

Definitions

  • the present invention relates to a wavelength-converting encapsulant composition particularly suitable for solar cell applications, a wavelength-converting encapsulant layer containing the same, and a solar cell module using the wavelength-converting encapsulant layer About. More specifically, a solar cell module capable of increasing power generation efficiency by wavelength conversion of light in a wavelength region that does not contribute to power generation into light in a wavelength region that contributes to power generation, a wavelength conversion type sealing material composition used therefor, and The present invention relates to a wavelength conversion type sealing material layer.
  • a solar cell having a wavelength conversion function that converts a wavelength (for example, an ultraviolet region) of incident light that does not contribute to photoelectric conversion into a wavelength that contributes to photoelectric conversion has been studied (for example, , See Patent Document 2).
  • a method for forming a light-emitting panel by mixing phosphor powder with a resin raw material has been proposed.
  • the degree of wavelength conversion (the efficiency of wavelength conversion and the shift width of the wavelength before and after the conversion) is not sufficient.
  • the wavelength absorption characteristics of the wavelength conversion media itself are different from those of other wavelength conversion media and It has been found that even the wavelength that the solar cell has absorbed and photoelectrically converted is absorbed, and as a result, a negative effect that the photoelectric conversion efficiency hardly improves or decreases can be exhibited.
  • the present invention is highly durable and advantageous in terms of cost, and wavelength conversion of light in a wavelength region that does not contribute to power generation into light in a wavelength region that contributes to power generation is performed. It aims at providing the wavelength conversion type sealing material composition for solar cells which can improve a photoelectric conversion efficiency.
  • an object of this invention is to provide the wavelength conversion type sealing material layer formed with the said wavelength conversion type sealing material composition, and a solar cell module using the same.
  • the present inventors have achieved the above object by using the wavelength conversion type sealing material composition, the wavelength conversion type sealing material layer shown below, and a solar cell module using the same. The inventors have found that this can be achieved and have completed the present invention.
  • the wavelength conversion type sealing material composition of the present invention absorbs ultraviolet light and absorbs light having a wavelength longer than that of the first organic material, and converts the light to light having a wavelength longer than the absorbed light.
  • a wavelength-converting encapsulant composition comprising a second organic substance that converts light having a longer wavelength than the absorbed light, An index C 1 represented by the product of the weight part P 1 , molar extinction coefficient ⁇ 1 , and reciprocal of molecular weight Mw 1 of the first organic substance in the wavelength conversion type sealing material;
  • the ratio of the second organic substance to the index C 2 represented by the product of the reciprocal of the weight part P 2 , molar extinction coefficient ⁇ 2 , and molecular weight Mw 2 in the wavelength conversion type sealing material (formula (1) )But, 0.001 ⁇ C 2 / C 1 ⁇ 0.5.
  • C 2 / C 1 [(P 2 ⁇ ⁇ 2 ) / Mw 2 ] / [(P 1 ⁇ ⁇ 1 )
  • the wavelength-converting encapsulant composition of the present invention By using the wavelength-converting encapsulant composition of the present invention, light that can effectively contribute to power generation by converting light in a shorter wavelength region to a longer wavelength side that has been lost without contributing to power generation. Can be used more effectively. Furthermore, for example, when a plurality of layers of wavelength conversion media are simply combined, or when a plurality of wavelength conversion media are simply mixed and mixed in a single layer, the light in the short wavelength region that the cell wants to absorb or the wavelength after conversion is different. In the present invention, the photoelectric conversion efficiency can be greatly improved without being absorbed by the wavelength conversion medium.
  • the molar absorption coefficient in this invention described also in the Example means the molar absorption coefficient at the time of irradiating the light of the maximum absorption wavelength of the said compound.
  • the present invention has the above-described configuration, so that the light emitted from the first organic substance (organic dye) is further emitted by the second organic substance (organic dye) used for excitation. It is presumed that the light can be converted into visible light having a further distant wavelength than when one kind of organic dye is converted.
  • the wavelength of sunlight that is photoelectrically converted by the solar cell is limited to a specific wavelength range.
  • an ultraviolet absorber is added to most solar cell encapsulants for the purpose of preventing deterioration of the members.
  • ultraviolet rays that have not been able to contribute to power generation can be effectively utilized by combining organic dyes with a specific ratio.
  • the organic dye absorbs even the wavelength region that is originally absorbed by the solar cell and should be photoelectrically converted, the negative effect that the photoelectric conversion efficiency is reduced (negative influence by the combined use) may also occur. It was found that it developed. Therefore, by controlling the concentration of the second organic substance (organic dye) that absorbs visible light as the configuration of the present invention so that the organic dye does not absorb the wavelength range to be photoelectrically converted, the above negative effect is generated. I guess that it is possible to prevent.
  • the light emission quantum yield (phi) 1 of the said 1st organic substance is 85% or more.
  • the photoelectric conversion efficiency can be improved more reliably.
  • the light emission quantum yield in this invention means the ratio of the number of emitted photons with respect to the number of absorbed photons when irradiated with the light of maximum excitation wavelength.
  • the light emission quantum yield (phi) 2 of the said 2nd organic substance is 85% or more.
  • the photoelectric conversion efficiency can be improved more reliably.
  • the maximum absorption wavelength ⁇ 1abs of the first organic material is 300 to 400 nm.
  • the first organic material By using the first organic material, light in the ultraviolet region that is difficult (or cannot be used) for photoelectric conversion in a normal solar battery cell is converted to a longer wavelength side, and the photoelectric conversion efficiency can be further improved.
  • the maximum absorption wavelength in the present invention refers to a wavelength at which the amount of light absorbed by the compound is maximum. More specifically, the maximum absorption wavelength ⁇ 1abs in the present invention refers to a wavelength at which the amount of light absorbed by the first organic substance is maximum.
  • the maximum excitation wavelength ⁇ 2ex of the second organic material is 330 to 500 nm.
  • the second organic material By using the second organic material, light in the short wavelength region of visible light that is difficult (or cannot be used) for photoelectric conversion in a normal solar battery cell is converted to a longer wavelength side, and the photoelectric conversion efficiency is further improved. be able to.
  • the light converted by the first organic material to the longer wavelength side may also be converted to the longer wavelength side to further improve the photoelectric conversion efficiency.
  • the maximum excitation wavelength in this invention means the wavelength of the light absorption amount of what contributes to light emission among the light which the said compound absorbs. More specifically, the maximum excitation wavelength ⁇ 2ex in the present invention refers to a wavelength at which the light absorption amount of the light absorbed by the second organic material has a maximum value.
  • the first organic material is selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative. It can be included at least.
  • the second organic substance is one selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative. It can be included at least.
  • the wavelength conversion type sealing material composition of the present invention has the wavelength conversion characteristics as described above, it is particularly preferably used for solar cell applications.
  • the wavelength conversion type sealing material layer of the present invention is characterized by being formed using the wavelength conversion type sealing material composition.
  • a wavelength conversion type sealing material layer having desirable optical characteristics is obtained.
  • the wavelength conversion type sealing material layer contains the first organic substance and the second organic substance so that the ratio of the above-described formula (1) falls within a specific range. It is possible to effectively convert light in a shorter wavelength region that has been lost without contributing to power generation to the long wavelength side and effectively use it as light that can contribute to power generation.
  • the wavelength conversion type sealing material layer of the present invention accepts at least one photon having the first wavelength as an input, and at least one photon having a second wavelength longer (larger) than the first wavelength. As an output, a function as a wavelength conversion type sealing material layer is expressed in this process.
  • the said wavelength conversion type sealing material layer is especially suitable for a solar cell use.
  • the solar cell module of the present invention includes a wavelength conversion type sealing material layer formed using the wavelength conversion type sealing material composition. Since the said solar cell module has the said wavelength conversion type sealing material layer, it becomes a solar cell module which has desirable optical characteristics (high quantum yield etc.).
  • the solar cell module of the present invention is preferably arranged so that incident light passes through the wavelength conversion type sealing material layer before reaching the solar cell.
  • the solar cell is a crystalline silicon solar cell, an amorphous silicon solar cell, a microcrystalline silicon solar cell, a thin film silicon solar cell, a heterojunction solar cell, a multijunction solar cell, a sulfide.
  • the said solar cell module can improve photoelectric conversion efficiency more effectively by using it for the solar cell module which laminates
  • silicon solar cells have a problem that the photoelectric conversion efficiency is low in the ultraviolet region. In the solar cell module, light can be used more effectively in this wavelength region.
  • the example of the solar cell module using the wavelength conversion type sealing material layer of this invention is shown.
  • the example of the solar cell module using the wavelength conversion type sealing material layer of this invention is shown.
  • the wavelength conversion type sealing material composition of the present invention absorbs ultraviolet light and absorbs light having a wavelength longer than that of the first organic material, and converts the light to light having a wavelength longer than the absorbed light.
  • a wavelength-converting encapsulant composition comprising a second organic substance that converts light having a longer wavelength than the absorbed light, An index C 1 represented by the product of the weight part P 1 , molar extinction coefficient ⁇ 1 , and reciprocal of molecular weight Mw 1 of the first organic substance in the wavelength conversion type sealing material;
  • the ratio of the second organic substance to the index C 2 represented by the product of the reciprocal of the weight part P 2 , molar extinction coefficient ⁇ 2 , and molecular weight Mw 2 in the wavelength conversion type sealing material (formula (1) )But, 0.001 ⁇ C 2 / C 1 ⁇ 0.5.
  • C 2 / C 1 [(P 2 ⁇ ⁇ 2 ) / Mw 2 ] / [(P 1 ⁇ ⁇ 1 )
  • the wavelength conversion type sealing material composition of the present invention absorbs ultraviolet light and absorbs light having a wavelength longer than that of the first organic material, and converts the light to light having a wavelength longer than the absorbed light. And a second organic substance that converts light having a longer wavelength than the absorbed light.
  • the first organic substance in the present invention is an organic substance that absorbs ultraviolet light and converts it into light having a longer wavelength than the absorbed light.
  • an organic material that can accept at least one photon having a first wavelength as an input and provide at least one photon having a second wavelength longer (larger) than the first wavelength as an output.
  • the organic substance may include not only an organic compound but also, for example, an organometallic complex, an organic-inorganic hybrid material, an oligomer compound containing a dye moiety, and a polymer compound containing a dye moiety.
  • the emission quantum yield ⁇ 1 of the first organic material is preferably 85% or more, more preferably 90% or more, and further preferably 93% or more.
  • the maximum absorption wavelength ⁇ 1abs of the first organic material is preferably 300 to 400 nm, 300 to 360 nm, or 330 to 350 nm.
  • the maximum emission wavelength ⁇ 1em of the first organic material is preferably 350 to 450 nm, may be 380 to 440 nm, and may be 400 to 420 nm.
  • the photoelectric conversion efficiency can be further improved.
  • the maximum emission wavelength ⁇ 1em refers to the wavelength of the maximum amount of light emitted from the light emitted from the first organic material.
  • an organic fluorescent compound is mentioned as said 1st organic substance.
  • the organic fluorescent compound known organic dye compounds (organic dyes, organic fluorescent dyes, etc.) can be used.
  • the organic fluorescent compound include perylene derivatives, pyrene derivatives, benzoxazole derivatives, benzothiazole derivatives, benzothiadiazole derivatives, benzotriazole derivatives, benzimidazole derivatives, benzimidazoline derivatives, benzopyrazole derivatives, indole derivatives, isoindole derivatives, purines Derivatives, pyrimidine derivatives, pyrazine derivatives, triazine derivatives, aromatic imide derivatives, benzoxazoyl derivatives, coumarin derivatives, styrene biphenyl derivatives, pyrazolone derivatives, bis (triazinylamino) stilbene disulfonic acid derivatives, bisstyryl biphenyl derivatives, bisbenzo Oxazolylthiophene derivative
  • the first organic material includes at least one selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative.
  • organic fluorescent compound more specifically, for example, naphthalimide, perylene, anthraquinone, coumarin, benzocoumarin, xanthene, phenoxazine, benzo [a] phenoxazine, benzo [b] phenoxazine, benzo [C] Phenoxazine, naphthalimide, naphtholactam, azlactone, methine, oxazine, thiazine, diketopyrrolopyrrole, quinacridone, benzoxanthene, thioepindrine, lactamimide, diphenylmaleimide, acetoacetamide, imidazothiazine, benzanthrone, Perylene monoimide, phthalimide, benzotriazole, benzothiadiazole, benzoxazole, pyrimidine, pyrazine, triazole, dibenzofuran, triazine, and their
  • an organometallic complex can be given.
  • the organometallic complex a known rare earth metal organic complex or the like can be used.
  • the organometallic complex there is no particular limitation on the rare earth element of the central metal element, for example, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, Examples include ytterbium and lutetium. Of these, europium or samarium is preferable. In particular, from the viewpoint of wavelength conversion efficiency, at least one of a europium complex or a samarium complex is preferable.
  • the ligand constituting the organic complex is not particularly limited and can be appropriately selected according to the metal used. Especially, it is preferable that it is a ligand which can form a complex with at least 1 sort (s) of europium or samarium.
  • the ligand is at least one selected from carboxylic acid, nitrogen-containing organic compound, nitrogen-containing aromatic heterocyclic compound, ⁇ -diketone, and phosphine oxide, which are neutral ligands. preferable.
  • carboxylic acid examples include aliphatic carboxylic acids such as butyric acid, stearic acid, oleic acid, coconut oil fatty acid, t-butyl carboxylic acid, and succinic acid, and aromatic carboxylic acids such as benzoic acid, naphthoic acid, and quinoline carboxylic acid. Etc.
  • nitrogen-containing organic compound examples include aromatic amines such as alkylamines and anilines, nitrogen-containing aromatic heterocyclic compounds, and specifically, 1,10-phenanthroline or bipyridyl. it can.
  • aromatic amines such as alkylamines and anilines
  • nitrogen-containing aromatic heterocyclic compounds and specifically, 1,10-phenanthroline or bipyridyl. it can.
  • imidazole, triazole, pyrimidine, pyrazine, aminopyridine, pyridine and derivatives thereof, nucleobases such as adenine, thymine, guanine and cytosine, and derivatives thereof can also be used.
  • ⁇ -diketones include 1,3-diphenyl-1,3-propanedione, acetylacetone, benzoylacetone, dibenzoylacetone diisobutyromethane, dibiparoylmethane, 3-methylpentane-2,4dione, 2, 2-dimethylpentane-3,5-dione, 2-methyl-1,3-butanedione, 1,3-butanedione, 3-phenyl-2.4-pentanedione, 1,1,1-trifluoro2,4-pentanedione, 1, 1,1-trifluoro 5,5-dimethyl-2,4-hexanedione, 2,2,6,6-tetramethyl-3,5-heptanedione, 3-methyl-2,4-pentanedione, 2-acetylcyclopentanone, 2-acetylcyclohexanone, 1-heptafluoropropyl-3-tert-butyl
  • examples of the first organic substance include an oligomer compound containing a dye moiety and a polymer compound containing a dye moiety.
  • an oligomer compound and the polymer compound an oligomer compound and a polymer compound containing a structure of a known organic dye compound (organic dye, organic fluorescent dye, etc.) in the molecule as a dye moiety can be used.
  • oligomer compound and the polymer compound examples include perylene derivatives, pyrene derivatives, benzoxazole derivatives, benzothiazole derivatives, benzothiadiazole derivatives, benzotriazole derivatives, benzimidazole derivatives, benzimidazoline derivatives, benzopyrazole derivatives, indole derivatives, Indole derivatives, purine derivatives, pyrimidine derivatives, pyrazine derivatives, triazine derivatives, aromatic imide derivatives, benzoxazoyl derivatives, coumarin derivatives, styrene biphenyl derivatives, pyrazolone derivatives, bis (triazinylamino) stilbene disulfonic acid derivatives, bisstyryl biphenyl Derivatives, bisbenzoxazolylthiophene derivatives, pentacene derivatives, fluorescene derivatives, rhodamine derivatives, Oligomer compound or polymer compound containing one molecular structure selected
  • the first organic substance is an oligomeric compound containing in its molecule one molecular structure selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative as a dye moiety.
  • a high molecular compound is preferable.
  • the molecular structure may be contained alone in the same oligomeric compound or polymer compound, or two or more kinds may be mixed and used.
  • the said oligomer compound and the said high molecular compound may be used independently, and may mix and use 2 or more types.
  • the main chain structure of the oligomer compound and the polymer compound is preferably an optically transparent resin skeleton.
  • the main chain structure include polyolefins such as polyethylene terephthalate, poly (meth) acrylate, polyvinyl acetate, polyethylene tetrafluoroethylene, polyimide, amorphous polycarbonate, siloxane sol-gel, polyurethane, polystyrene, and polyethersulfone. And polyarylate, epoxy resin, and silicone resin. These main chain structures may be used alone or in admixture of two or more.
  • the blending amount of the first organic material is preferably 0.001 to 0.5 parts by weight, and 0.001 to 0 parts per 100 parts by weight of the matrix resin of the wavelength conversion type sealing material composition. It may be 3 parts by weight or 0.005 to 0.2 parts by weight.
  • the second organic substance in the present invention is an organic substance that absorbs ultraviolet light and converts it into light having a longer wavelength than the absorbed light.
  • an organic material that can accept at least one photon having a first wavelength as an input and provide at least one photon having a second wavelength longer (larger) than the first wavelength as an output.
  • the organic substance may include not only an organic compound but also, for example, an organometallic complex, an organic-inorganic hybrid material, an oligomer compound containing a dye moiety, and a polymer compound containing a dye moiety.
  • the emission quantum yield ⁇ 2 of the second organic material is preferably 85% or more, more preferably 90% or more, and further preferably 93% or more.
  • the maximum excitation wavelength ⁇ 2ex of the second organic substance is preferably 330 to 500 nm, and may be 340 to 450 nm.
  • the maximum emission wavelength ⁇ 2em of the second organic material is preferably 400 to 550 nm, and may be 410 to 530 nm.
  • the photoelectric conversion efficiency can be further improved.
  • the maximum excitation wavelength ⁇ 2em refers to a wavelength having the maximum light emission amount among the light emitted from the compound (the second organic material).
  • an organic fluorescent compound is mentioned as said 2nd organic substance.
  • the organic fluorescent compound known organic dye compounds (organic dyes, organic fluorescent dyes, etc.) can be used.
  • the organic fluorescent compound include perylene derivatives, pyrene derivatives, benzoxazole derivatives, benzothiazole derivatives, benzothiadiazole derivatives, benzotriazole derivatives, benzimidazole derivatives, benzimidazoline derivatives, benzopyrazole derivatives, indole derivatives, isoindole derivatives, purines Derivatives, pyrimidine derivatives, pyrazine derivatives, triazine derivatives, aromatic imide derivatives, benzoxazoyl derivatives, coumarin derivatives, styrene biphenyl derivatives, pyrazolone derivatives, bis (triazinylamino) stilbene disulfonic acid derivatives, bisstyryl biphenyl derivatives, bisbenzo Oxazolylthiophene derivatives
  • the second organic material includes at least one selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative.
  • organic fluorescent compound more specifically, for example, naphthalimide, perylene, anthraquinone, coumarin, benzocoumarin, xanthene, phenoxazine, benzo [a] phenoxazine, benzo [b] phenoxazine, benzo [C] Phenoxazine, naphthalimide, naphtholactam, azlactone, methine, oxazine, thiazine, diketopyrrolopyrrole, quinacridone, benzoxanthene, thioepindrine, lactamimide, diphenylmaleimide, acetoacetamide, imidazothiazine, benzanthrone, Perylene monoimide, phthalimide, benzotriazole, benzothiadiazole, benzoxazole, pyrimidine, pyrazine, triazole, dibenzofuran, triazine, and their
  • an organometallic complex is mentioned as said 2nd organic substance.
  • the organometallic complex a known rare earth metal organic complex or the like can be used.
  • the organometallic complex there is no particular limitation on the rare earth element of the central metal element, for example, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, Examples include ytterbium and lutetium. Of these, europium or samarium is preferable. In particular, from the viewpoint of wavelength conversion efficiency, at least one of a europium complex or a samarium complex is preferable.
  • the ligand constituting the organic complex is not particularly limited and can be appropriately selected according to the metal used. Especially, it is preferable that it is a ligand which can form a complex with at least 1 sort (s) of europium or samarium.
  • the ligand is at least one selected from carboxylic acid, nitrogen-containing organic compound, nitrogen-containing aromatic heterocyclic compound, ⁇ -diketone, and phosphine oxide, which are neutral ligands. preferable.
  • carboxylic acid examples include aliphatic carboxylic acids such as butyric acid, stearic acid, oleic acid, coconut oil fatty acid, t-butyl carboxylic acid, and succinic acid, and aromatic carboxylic acids such as benzoic acid, naphthoic acid, and quinoline carboxylic acid. Etc.
  • nitrogen-containing organic compound examples include aromatic amines such as alkylamines and anilines, nitrogen-containing aromatic heterocyclic compounds, and specifically, 1,10-phenanthroline or bipyridyl. it can.
  • aromatic amines such as alkylamines and anilines
  • nitrogen-containing aromatic heterocyclic compounds and specifically, 1,10-phenanthroline or bipyridyl. it can.
  • imidazole, triazole, pyrimidine, pyrazine, aminopyridine, pyridine and derivatives thereof, nucleobases such as adenine, thymine, guanine and cytosine, and derivatives thereof can also be used.
  • ⁇ -diketones include 1,3-diphenyl-1,3-propanedione, acetylacetone, benzoylacetone, dibenzoylacetone diisobutyromethane, dibiparoylmethane, 3-methylpentane-2,4dione, 2, 2-dimethylpentane-3,5-dione, 2-methyl-1,3-butanedione, 1,3-butanedione, 3-phenyl-2.4-pentanedione, 1,1,1-trifluoro2,4-pentanedione, 1, 1,1-trifluoro 5,5-dimethyl-2,4-hexanedione, 2,2,6,6-tetramethyl-3,5-heptanedione, 3-methyl-2,4-pentanedione, 2-acetylcyclopentanone, 2-acetylcyclohexanone, 1-heptafluoropropyl-3-tert-butyl
  • examples of the second organic substance include an oligomer compound containing a dye moiety and a polymer compound containing a dye moiety.
  • an oligomer compound and the polymer compound an oligomer compound and a polymer compound containing a structure of a known organic dye compound (organic dye, organic fluorescent dye, etc.) in the molecule as a dye moiety can be used.
  • oligomer compound and the polymer compound examples include perylene derivatives, pyrene derivatives, benzoxazole derivatives, benzothiazole derivatives, benzothiadiazole derivatives, benzotriazole derivatives, benzimidazole derivatives, benzimidazoline derivatives, benzopyrazole derivatives, indole derivatives, Indole derivatives, purine derivatives, pyrimidine derivatives, pyrazine derivatives, triazine derivatives, aromatic imide derivatives, benzoxazoyl derivatives, coumarin derivatives, styrene biphenyl derivatives, pyrazolone derivatives, bis (triazinylamino) stilbene disulfonic acid derivatives, bisstyryl biphenyl Derivatives, bisbenzoxazolylthiophene derivatives, pentacene derivatives, fluorescene derivatives, rhodamine derivatives, Oligomer compound or polymer compound containing one molecular structure selected
  • the first organic substance is an oligomeric compound containing in its molecule one molecular structure selected from the group consisting of a perylene derivative, a benzoxazole derivative, a benzothiadiazole derivative, a benzotriazole derivative, and a fluorene derivative as a dye moiety.
  • a high molecular compound is preferable.
  • the molecular structure may be contained alone in the same oligomeric compound or polymer compound, or two or more kinds may be mixed and used.
  • the said oligomer compound and the said high molecular compound may be used independently, and may mix and use 2 or more types.
  • the main chain structure of the oligomer compound and the polymer compound is preferably an optically transparent resin skeleton.
  • the main chain structure include polyolefins such as polyethylene terephthalate, poly (meth) acrylate, polyvinyl acetate, polyethylene tetrafluoroethylene, polyimide, amorphous polycarbonate, siloxane sol-gel, polyurethane, polystyrene, and polyethersulfone. And polyarylate, epoxy resin, and silicone resin. These main chain structures may be used alone or in admixture of two or more.
  • the blending amount of the second organic material is preferably 0.0001 to 0.1 parts by weight, and 0.0001 to 0 parts by weight with respect to 100 parts by weight of the matrix resin of the wavelength conversion type sealing material composition. 0.05 parts by weight, or 0.001 to 0.02 parts by weight.
  • the wavelength conversion type sealing material composition of the present invention has a wavelength conversion function.
  • the said wavelength conversion type sealing material composition converts the wavelength of incident light into a longer wavelength.
  • the wavelength-converting encapsulant composition can be formed by dispersing a first organic material and a second organic material having a wavelength conversion function in an optically transparent matrix resin.
  • an optically transparent matrix resin examples include polyolefins such as polyethylene terephthalate, poly (meth) acrylate, polyvinyl acetate, polyethylene tetrafluoroethylene, polyimide, amorphous polycarbonate, siloxane sol-gel, polyurethane, polystyrene, polyethersulfone, poly Examples include arylate, epoxy resin, and silicone resin. These matrix resins may be used alone or in admixture of two or more.
  • the poly (meth) acrylate includes polyacrylate and polymethacrylate, and examples thereof include (meth) acrylic ester resin.
  • examples of the polyolefin resin include polyethylene, polypropylene, and polybutadiene.
  • examples of the polyvinyl acetate include polyvinyl formal, polyvinyl butyral (PVB resin), and modified PVB.
  • Examples of the constituent monomer of the (meth) acrylic ester resin include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate.
  • (Meth) acrylic acid alkyl esters such as cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, benzyl acrylate, and benzyl methacrylate.
  • (meth) acrylic acid alkyl ester in which the alkyl group is substituted with a hydroxyl group, an epoxy group, a halogen group, or the like can be given. These compounds may be used alone or in combination of two or more.
  • the alkyl group in the ester moiety preferably has 1 to 18 carbon atoms, and more preferably 1 to 8 carbon atoms.
  • (meth) acrylic ester resin in addition to (meth) acrylic ester, an unsaturated monomer copolymerizable with these may be used as a copolymer.
  • unsaturated monomer examples include unsaturated organic acids such as methacrylic acid and acrylic acid, styrene, ⁇ -methylstyrene, acrylamide, diacetone acrylamide, acrylonitrile, methacrylonitrile, maleic anhydride, phenylmaleimide, cyclohexylmaleimide, and the like. I can give you. These unsaturated monomers may be used alone or in admixture of two or more.
  • (meth) acrylic acid esters among others, methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, It is preferable to use 2-ethylhexyl methacrylate and its functional group-substituted (meth) acrylic acid alkyl ester. From the viewpoint of durability and versatility, methyl methacrylate is more preferable.
  • Examples of the copolymer of the (meth) acrylic acid ester and the unsaturated monomer include (meth) acrylic acid ester-styrene copolymer, ethylene-vinyl acetate copolymer, and the like.
  • an ethylene-vinyl acetate copolymer is preferable from the viewpoint of moisture resistance, versatility, and cost
  • (meth) acrylic acid ester is preferable from the viewpoint of durability and surface hardness.
  • the combined use of an ethylene-vinyl acetate copolymer and a (meth) acrylic acid ester is preferable from the above viewpoints.
  • the ethylene-vinyl acetate copolymer preferably has a vinyl acetate monomer unit content of 10 to 35 parts by weight, and 20 to 30 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer. More preferably, the above content is preferable from the viewpoint of uniform dispersibility in a matrix resin such as a rare earth complex.
  • ethylene-vinyl acetate copolymer When using the ethylene-vinyl acetate copolymer as an optically transparent matrix resin, commercially available products can be used as appropriate.
  • commercially available ethylene-vinyl acetate copolymers include Ultrasen (manufactured by Tosoh Corporation), Everflex (manufactured by Mitsui DuPont Polychemical Co., Ltd.), Suntec EVA (manufactured by Asahi Kasei Chemicals Corporation), UBE EVA copolymer ( Ube Maruzen Polyethylene Co., Ltd.), Evertate (Sumitomo Chemical Co., Ltd.), Novatec EVA (Nihon Polyethylene Co., Ltd.), Smitate (Sumitomo Chemical Co., Ltd.), Nipoflex (Tosoh Corp.), and the like.
  • a crosslinkable monomer may be added to form a resin having a crosslinked structure.
  • crosslinkable monomer examples include compounds obtained by reacting ⁇ , ⁇ -unsaturated carboxylic acid with dicyclopentenyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, benzyl (meth) acrylate, and polyhydric alcohol (for example, polyethylene glycol di (meth) acrylate (having 2 to 14 ethylene groups), trimethylolpropane di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethoxytri (meth) acrylate, Trimethylolpropane propoxy tri (meth) acrylate, tetramethylol methane tri (meth) acrylate, tetramethylol methane tetra (meth) acrylate, polypropylene glycol di (meth) acrylate (pro Having 2 to 14 pyrene groups), dipentaerythritol penta (
  • crosslinkable monomers may be used alone or in admixture of two or more.
  • trimethylolpropane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and bisphenol A polyoxyethylene dimethacrylate are preferred as the crosslinkable monomer.
  • a thermal polymerization initiator or a photopolymerization initiator can be added to the crosslinkable monomer, and polymerized and crosslinked by heating or light irradiation to form a crosslinked structure.
  • thermoplastic resin polymerization initiator examples include 2,5-dimethylhexane-2,5-dihydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3, Di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, dicumyl peroxide, ⁇ , ⁇ '-bis (t-butylperoxy) Isopropyl) benzene, n-butyl-4,4-bis (t-butylperoxy) butane, 2,2-bis (t-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane, 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, t-butyl
  • the blending amount of the thermal polymerization initiator may be 0.1 to 5 parts by weight with respect to 100 parts by weight of the matrix resin, for example.
  • the photopolymerization initiator a known photoinitiator that generates a free radical by ultraviolet light or visible light can be appropriately used.
  • the photopolymerization initiator include benzoin ethers such as benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isobutyl ether, and benzoin phenyl ether, benzophenone, N, N′-tetramethyl-4,4′-diamino Benzophenones (Michler's ketone), benzophenones such as N, N′-tetraethyl-4,4′-diaminobenzophenone, benzyl ketals such as benzyldimethyl ketal (manufactured by Ciba Japan Chemicals, Irgacure 651), benzyl diethyl ketal, Acetophenones such as 2,2-dimethoxy-2-phenylacetophenone,
  • photopolymerization initiator examples include a combination of 2,4,5-triallylimidazole dimer and 2-mercaptobenzoxazole, leucocrystal violet, tris (4-diethylamino-2-methylphenyl) methane, and the like. Etc. Further, for example, known additives may be used as appropriate, such as tertiary amines such as triethanolamine for benzophenone.
  • the blending amount of the photopolymerization initiator can be 0.1 to 5 parts by weight with respect to 100 parts by weight of the matrix resin, for example.
  • the refractive index of the matrix resin is, for example, in the range of 1.4 to 1.7, in the range of 1.45 to 1.65, or in the range of 1.45 to 1.55. In some embodiments, the refractive index of the polymer matrix resin is 1.5.
  • the wavelength conversion type sealing material composition can be formed, for example, by dispersing, adsorbing, and impregnating the first organic material having the wavelength conversion function and the second organic material in the matrix resin. it can.
  • the first organic substance is represented by a product of the reciprocal number of the weight part P 1 , the molar extinction coefficient ⁇ 1 , and the molecular weight Mw 1 in the wavelength conversion type sealing material.
  • the matrix of a wavelength conversion type sealing material composition is preferably 0.001 to 0.5 parts by weight and 0.0001 to 0.1 parts by weight with respect to 100 parts by weight of the resin. It may be 0.001 to 0.3 parts by weight and 0.0001 to 0.05 parts by weight, or 0.005 to 0.2 parts by weight and 0.001 to 0.02 parts by weight.
  • the molecular weights of the first organic substance and the second organic substance are determined by GC / APCI-TOF MS spectrum measurement, various mass spectrometry methods (ionization methods such as ESI method, APCI method, MALDI method, TOF type, FT- It can be obtained by a method using a detection method such as ICR type or IT type. Further, when the organic substance is a high molecular weight or oligomer, the weight average molecular weight is obtained by GPC measurement (a combined system with a detector such as a differential refractometer and a light scattering detector) as necessary. The molecular weight can be determined.
  • the maximum emission wavelength region of the first organic material overlaps with the maximum excitation wavelength region of the second organic material.
  • ultraviolet light or visible light in the short wavelength region that is difficult (or cannot be used) for photoelectric conversion in a normal solar battery cell is converted to a longer wavelength side to further improve photoelectric conversion efficiency.
  • the light converted by the first organic material to the longer wavelength side may also be converted to the longer wavelength side to further improve the photoelectric conversion efficiency.
  • the wavelength conversion type sealing material composition may contain a known additive as long as desired performance is not impaired.
  • the additive include thermoplastic polymers, antioxidants, UV inhibitors, light stabilizers, organic peroxides, fillers, plasticizers, silane coupling agents, acid acceptors, and clays. These may be used singly or in combination of two or more.
  • the wavelength conversion type sealing material layer of this invention was formed using the said wavelength conversion type sealing material composition.
  • the above wavelength conversion type sealing material layer may be manufactured according to a known method.
  • a composition obtained by mixing each of the above materials by a known method using heat kneading, a super mixer (high-speed fluid mixing machine), a roll mill, a plast mill, etc. is subjected to ordinary extrusion molding, calendar molding (calendering), vacuum heat It can be suitably produced by a method of forming a sheet-like material by molding under pressure or the like.
  • after forming the said layer on PET film etc. it can manufacture by the method of transcribe
  • the wavelength conversion-type sealing material composition containing the matrix resin, the first organic substance, the second organic substance, and the like may be directly applied to a surface protective layer or a separator.
  • the above material may be applied as a mixed composition with other materials.
  • the matrix resin When applied as the above mixed composition, the matrix resin preferably has a melting point of 50 to 250 ° C., more preferably 50 to 200 ° C., and 50 to 180 ° C. in consideration of processability. More preferably.
  • the melting point of the wavelength conversion type sealing material composition is 50 to 250 ° C.
  • the kneading and melting and coating temperature of the composition are preferably performed at a temperature obtained by adding 30 to 100 ° C. to the melting point.
  • the wavelength converting encapsulant layer is manufactured into a thin film structure by the following steps: (i) The polymer (matrix resin) powder is a solvent (eg, tetrachloroethylene (TCE) in a predetermined ratio. ), Preparing a polymer solution dissolved in cyclopentanone, dioxane, etc.) (ii) mixing a luminescent dye (fluorescent dye compound) containing the polymer mixture with the luminescent dye in a predetermined weight ratio Preparing a dye-containing polymer solution, (iii) pouring the dye / polymer thin film directly onto the glass substrate, after which the substrate is allowed to run from room temperature up to 100 ° C.
  • a solvent eg, tetrachloroethylene (TCE) in a predetermined ratio.
  • TCE tetrachloroethylene
  • the fluorescent dye compound has a melting point of 250 ° C. or lower, desirably 220 ° C. or lower, and more desirably 210 ° C. or lower.
  • the melting point is preferably 50 ° C. or higher, more preferably 60 ° C. or higher, and further preferably 70 ° C. or higher.
  • the thickness of the wavelength conversion type sealing material layer is preferably 20 to 2000 ⁇ m, more preferably 50 to 1000 ⁇ m, and further preferably 200 to 800 ⁇ m. If the thickness is less than 20 ⁇ m, the wavelength conversion function is hardly exhibited. On the other hand, when it becomes thicker than 2000 micrometers, adhesiveness with another layer falls and it is disadvantageous also in cost.
  • the optical thickness (absorbance) of the wavelength conversion type sealing material layer is preferably from 0.5 to 6, more preferably from 1 to 4, and further preferably from 1 to 3. If the absorbance is low, the wavelength conversion function is hardly exhibited. On the other hand, if the absorbance is too large, it is disadvantageous in terms of cost.
  • the absorbance is a value calculated according to Lambert-Beer law.
  • the solar cell module 1 of the present invention includes the wavelength conversion sealing material layer 20 and the solar cells 30. 1 and 2 show simple schematic diagrams as an example, but the present invention is not limited to these. Moreover, the sealing material layer 40 and the back sheet
  • the solar cell module since the solar cell module includes the wavelength conversion type sealing material layer, it can convert a wavelength that does not normally contribute to photoelectric conversion into a wavelength that can contribute to photoelectric conversion. Specifically, a certain wavelength can be converted into a longer wavelength, for example, a wavelength shorter than 370 nm can be converted into a wavelength of 370 nm or more. In particular, it converts the wavelength in the ultraviolet region (10 nm to 365 nm) to the wavelength in the visible light region (370 to 800 nm). Moreover, the range of the wavelength which contributes to photoelectric conversion changes with the kind of solar cell, for example, even if it is a silicon-type solar cell, it changes with the crystal
  • the wavelength contributing to photoelectric conversion is not necessarily limited to the wavelength in the visible light region.
  • the solar battery cell examples include a crystalline silicon solar battery, an amorphous silicon solar battery, a microcrystalline silicon solar battery, a thin film silicon solar battery, a heterojunction solar battery, a multijunction solar battery, a cadmium sulfide / cadmium telluride solar battery, A CIS thin film solar cell, a CIGS thin film solar cell, a CZTS thin film solar cell, a III-V group solar cell, a dye-sensitized solar cell, or an organic semiconductor solar cell can be used.
  • the solar battery cell is preferably a crystalline silicon solar battery.
  • the solar cell encapsulant layer may be transferred to the solar cell or the like, or may be directly coated on the solar cell. Moreover, you may form the said sealing material layer for solar cells, and another layer simultaneously.
  • the solar cell module of the present invention is preferably arranged so that incident light passes through the wavelength conversion type sealing material layer before reaching the solar cell.
  • the surface protective layer a known layer used as a surface protective layer for solar cells can be used.
  • the surface protective layer include a front sheet and glass.
  • various things, such as a white board and the presence or absence of embossing, can be used suitably, for example.
  • Matrix resin Summitate KA30, ethylene vinyl acetate (EVA) resin (Sumitomo Chemical Co., Ltd.)
  • Peroxide Perbutyl E, t-butylperoxy-2-ethylhexyl monocarbonate (manufactured by NOF Corporation)
  • Crosslinking aid TAIC, triallyl isocyanurate (Nippon Kasei Co., Ltd.)
  • Light stabilizer Tinuvin 144, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butylmalo Nate (BASF)
  • Silane coupling agent KBM503, 3-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicon
  • each sealing material layer was produced by the following method based on the formulation of each compound.
  • [Resin composition of encapsulating sheet] 100 parts by weight of the EVA resin and each compound were weighed, dry blended, and then melt-kneaded using a single screw extruder to obtain an ethylene copolymer composition pellet. .
  • a sealing material layer resin sheet (thickness: about 650 ⁇ m) was produced from the pellets using a press molding machine.
  • the measurement of the maximum absorption wavelength was performed using an ultraviolet-visible spectrophotometer (manufactured by JASCO Corporation, V-560, wavelength range 300 to 800 nm). The wavelength showing the maximum absorbance in the absorption spectrum was defined as the maximum absorption wavelength.
  • the maximum excitation wavelength and maximum emission wavelength are measured using a fluorescence spectrophotometer (F-4500, manufactured by Hitachi High-Technologies Corporation), and the emission wavelength that maximizes the emission intensity in the (excitation-emission) three-dimensional measurement is maximized.
  • F-4500 fluorescence spectrophotometer
  • the wavelength showing the maximum value of the emission intensity was defined as the maximum excitation wavelength.
  • the emission quantum yield was measured using MCPD (manufactured by Otsuka Electronics Co., Ltd., MCPD-9800, QE1100L, software Ver. 1.10.10.1). The emission quantum yield when excited at the maximum excitation wavelength was measured. It was measured.
  • the sealing sheet obtained above was cut into 20 cm ⁇ 20 cm, and tempered glass (manufactured by Asahi Glass Co .: Solite) as a protective glass, sealing sheet, solar battery cell (manufactured by Q Cell: Q6LTT3-G2-200 / 1700-A) , Crystalline silicon type), sealing sheet for back surface (400 ⁇ m thick EVA sheet), PET film as a back sheet, 140 ° C. using a vacuum laminator (NPC Corporation: LM-50x50-S), Lamination was carried out under conditions of 5 minutes under vacuum and 10 minutes under pressure to produce a solar cell module.
  • the spectral sensitivity of the solar cell module was measured using a spectral sensitivity measuring device (CEP-25RR, manufactured by Spectrometer Co., Ltd.), and a Jsc value calculated from the spectral sensitivity measurement was obtained.
  • the Jsc value is a short-circuit current density calculated by calculating a spectral sensitivity spectrum obtained from sample measurement by a spectral sensitivity measuring device and reference sunlight.
  • Tables 1 to 3 below show the measurement results when the obtained sealing material layers (sealing sheets) were used.
  • the output is calculated by calculating the increase / decrease ratio of the Jsc value in each example / comparative example with respect to the Jsc value in the case of only EVA resin.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
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  • Computer Hardware Design (AREA)
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  • Photovoltaic Devices (AREA)

Abstract

La présente invention vise à concevoir une couche encapsulante utilisée dans une pile solaire présentant une durabilité élevée, mais également économiquement avantageuse, et permettant d'améliorer le rendement photovoltaïque d'une pile solaire en transformant par une conversion de longueur d'onde la lumière d'une région de longueur d'onde ne contribuant pas à la production d'énergie, en une lumière se situant dans une région de longueur d'onde contribuant à la production d'énergie. La composition encapsulante à conversion de longueur d'onde comprend un premier matériau organique absorbant la lumière ultraviolette et convertissant celle-ci en une lumière dont la longueur d'onde est supérieure à celle de la lumière absorbée, et un second matériau organique absorbant une lumière ayant une longueur d'onde supérieure à celle du premier matériau organique et convertissant celle-ci en une lumière ayant une longueur d'onde supérieure à celle de la lumière absorbée, ladite composition encapsulante à conversion de longueur d'onde étant caractérisée en ce que le rapport d'un indice C2 à un indice C1(formule (1)) respecte 0,001 ≤ C2 / C1 ≤ 0,5, l'indice C1 représentant, pour le premier matériau organique, le produit du nombre de parties en poids P1 dans l'encapsulant à conversion de longueur d'onde par le coefficient d'extinction molaire ε1 et l'inverse du poids moléculaire Mw1 et l'indice C2 représentant, pour le second matériau organique, le produit du nombre de parties en poids P2 dans l'encapsulant à conversion de longueur d'onde par le coefficient d'extinction molaire ε2 et l'inverse du poids moléculaire Mw2. (Formule (1)): C2 / C1 = [(P2 × ε2) / Mw2] / [(P1 × ε1) / Mw1]
PCT/JP2014/078895 2013-10-30 2014-10-30 Composition encapsulante à conversion de longueur d'onde, couche encapsulante à conversion de longueur d'onde, et module de pile solaire WO2015064688A1 (fr)

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