Manufacturing method of solar cell module

Abstract

To provide a solar cell sealing member, a solar cell module, and a manufacturing method thereof which can be sealed at a low temperature, do not cause deformation due to heat, and do not cause a decrease in solar cell output, and can be sealed with a conventional vacuum heating laminater for a perovskite solar cell, an organic thin film solar cell, a flexible solar cell, and a solar cell with a transparent resin or a film applied to a light-transmissive substrate.SOLUTION: In a solar cell module including a solar cell and a silicone rubber sealing layer, the silicone rubber sealing layer is a cured product of a silicone rubber composition containing a photoactive hydrosilylation reaction catalyst.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a solar cell module having a silicone rubber sealing layer, a method for producing the same, and a solar cell encapsulant. [Background technology]

[0002] In recent years, there has been active development of flexible solar cells that emphasize cost reduction and design, solar cells with see-through properties, lightweight and easy-to-handle organic thin-film solar cells, and solar cells that use transparent resins or films other than glass as light-transmitting substrates. Among these, research and development of solar cells with perovskite compounds in the power generation layer (hereinafter referred to as "perovskite solar cells") has been promoted as a solar cell that combines low cost and high efficiency. Perovskite solar cells can be manufactured more inexpensively than crystalline silicon solar cells and have high power generation efficiency. Perovskite solar cells are obtained by stacking, from the light-receiving side, a light-transmitting substrate or film, a transparent conductive film, an electron transport layer, a power generation layer, a hole transport layer, and a back electrode. In the so-called modularization process for sealing the above-mentioned elements, a structure in which an encapsulant is applied to the back side of the back electrode and the backmost surface is sealed with a substrate and film has been investigated. Various proposals have been made, such as a structure using glass or the like for the light-receiving side light-transmitting substrate and the rearmost side substrate, and a flexible structure using a light-transmitting film on the light-receiving side and a film on the rearmost side.

[0003] On the other hand, perovskite solar cells are vulnerable to water vapor, so a high level of water vapor blocking is required. In particular, solar cells are exposed to harsh outdoor environments for long periods of time, so the encapsulation material and encapsulation process are extremely important.

[0004] Additionally, perovskite solar cells are sensitive to heat, so care must be taken when sealing them. Encapsulants generally gain their ability to seal elements through processes of filling, adhering, and hardening by heating. Therefore, while the heating process is important, in the case of perovskite solar cells, applying temperatures above 120°C is not appropriate, as it will lead to a decrease in power generation capacity.

[0005] Patent Document 1 discloses that a sealing material is formed by applying a material in which a moisture-absorbing filler such as calcium oxide is added to a polyisobutylene-based polymer. The method of removing water vapor using a moisture-absorbing filler has a limited moisture absorption capacity, and for solar cells exposed to harsh environments for long periods of time, the output retention is limited. Patent Document 2 also proposes a method in which an acrylic or other resin material is adhered to the element and a film with water vapor barrier properties is attached to the outermost surface. When using resin, there are many issues in the application process, such as the problem of air bubble entrapment and degassing between the resin and the water vapor barrier film. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-15902 [Patent Document 2] Patent Publication No. 2021-174884 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and has an object to provide a solar cell encapsulant and solar cell module that can be encapsulated at low temperatures for perovskite solar cells, organic thin-film solar cells, flexible solar cells, solar cells in which a transparent resin or film is applied to a light-transmitting substrate, etc., without causing deformation due to heat or a decrease in solar cell output, and that can be encapsulated using a conventional vacuum heating laminator, as well as a method for producing the same. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a solar cell module including a solar cell and a silicone rubber sealing layer, wherein the silicone rubber sealing layer is a cured product of a silicone rubber composition containing a photoactivated hydrosilylation reaction catalyst.

[0009] Such a solar cell module can be sealed at low temperatures, does not cause deformation due to heat or a decrease in solar cell output, and can be sealed using a conventional vacuum heating laminator.

[0010] The silicone rubber composition further comprises: (A) 100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 to 10,000 and having two or more alkenyl groups bonded to silicon atoms in each molecule (B) Specific surface area measured by the BET method is 50 to 500 m 2 Reinforcing silica: 10 to 150 parts by mass / g (C) an organohydrogenpolysiloxane having two or more hydrosilyl groups per molecule: an amount such that the number of hydrosilyl groups in the component (C) is 0.5 to 5 moles per mole of alkenyl groups in the component (A). (D) Photoactivatable hydrosilylation catalyst: 0.5 to 1,000 ppm in terms of platinum group metal mass relative to the component (A) It is preferred that the compound contains:

[0011] In the present invention, such a silicone rubber composition can be used.

[0012] The photoactivatable hydrosilylation catalyst may be selected from the group consisting of (1,5-cyclooctadienyl)diphenyl platinum complex, (1,5-cyclooctadienyl)dipropyl platinum complex, (2,5-norboradiene)dimethyl platinum complex, (2,5-norboradiene)diphenyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methylcyclopentadienyl)diethyl platinum complex, (trimethylsilylcyclopentadienyl)diphenyl platinum complex, (methylcycloocta-1,5-dienyl)diethyl platinum complex, (cyclopentadienyl)trimethyl platinum complex, and (cyclopentadienyl). Preferably, the photoactivatable hydrosilylation catalyst is one or more selected from the group consisting of (cyclopentadienyl)ethyldimethyl platinum complex, (cyclopentadienyl)acetyldimethyl platinum complex, (methylcyclopentadienyl)trimethyl platinum complex, (methylcyclopentadienyl)trihexyl platinum complex, (trimethylsilylcyclopentadienyl)trimethyl platinum complex, (dimethylphenylsilylcyclopentadienyl)triphenyl platinum complex, (cyclopentadienyl)dimethyltrimethylsilylmethyl platinum complex, and bis(β-diketonato)platinum complex.

[0013] In the present invention, such a photoactivated hydrosilylation reaction catalyst can be used.

[0014] The solar cell is preferably a perovskite solar cell.

[0015] Such a solar cell module can provide a low-cost, highly efficient solar cell module.

[0016] Further, the present invention provides a method for manufacturing the solar cell module, comprising the steps of: Step (i): preparing the silicone rubber composition Step (ii): Irradiating the silicone rubber composition with ultraviolet light and Step (iii): A step of laminating the UV-irradiated silicone rubber composition and the solar cell, and pressing them at a temperature of 20 to 100°C to form the silicone rubber sealing layer. The present invention provides a method for manufacturing a solar cell module, comprising:

[0017] This method of manufacturing a solar cell module allows sealing at low temperatures, does not cause deformation due to heat or a decrease in solar cell output, and can be used to obtain a solar cell module by sealing using a conventional vacuum heating laminator.

[0018] In the method for producing a solar cell module, the silicone rubber composition prepared in step (i) is preferably in the form of a sheet.

[0019] According to this method for producing a solar cell module, a solar cell module can be obtained using a vacuum laminator that is widely used in the production of solar cell modules.

[0020] In the method for producing a solar cell module, the step (iii) is preferably carried out using a vacuum laminator.

[0021] Such a method for manufacturing a solar cell module makes it possible to easily obtain a solar cell module.

[0022] In addition, in the present invention, A solar cell encapsulant, (A) 100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 to 10,000 and having two or more alkenyl groups bonded to silicon atoms in each molecule (B) Specific surface area measured by the BET method is 50 to 500 m 2 Reinforcing silica: 10 to 150 parts by mass / g (C) an organohydrogenpolysiloxane having two or more hydrosilyl groups per molecule: an amount such that the number of hydrosilyl groups in the component (C) is 0.5 to 5 moles per mole of alkenyl groups in the component (A). and (D) Photoactivatable hydrosilylation catalyst: 0.5 to 1,000 ppm in terms of platinum group metal mass relative to the component (A) The present invention provides a solar cell encapsulant comprising a silicone rubber composition containing

[0023] Such a solar cell encapsulant can be sealed at low temperatures, does not cause deformation due to heat or a decrease in solar cell output, and can be sealed using a conventional vacuum heating laminator.

[0024] In the present invention, the photoactivatable hydrosilylation catalyst is selected from the group consisting of (1,5-cyclooctadienyl)diphenyl platinum complex, (1,5-cyclooctadienyl)dipropyl platinum complex, (2,5-norboradiene)dimethyl platinum complex, (2,5-norboradiene)diphenyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methylcyclopentadienyl)diethyl platinum complex, (trimethylsilylcyclopentadienyl)diphenyl platinum complex, (methylcycloocta-1,5-dienyl)diethyl platinum complex, and (cyclopentadienyl)trimethyl platinum complex. Preferably, the photoactivatable hydrosilylation catalyst is one or more selected from the group consisting of platinum complexes, (cyclopentadienyl)ethyldimethyl platinum complexes, (cyclopentadienyl)acetyldimethyl platinum complexes, (methylcyclopentadienyl)trimethyl platinum complexes, (methylcyclopentadienyl)trihexyl platinum complexes, (trimethylsilylcyclopentadienyl)trimethyl platinum complexes, (dimethylphenylsilylcyclopentadienyl)triphenyl platinum complexes, (cyclopentadienyl)dimethyltrimethylsilylmethyl platinum complexes, and bis(β-diketonato)platinum complexes.

[0025] In the present invention, such a photoactivated hydrosilylation reaction catalyst can be used.

[0026] The solar cell encapsulant of the present invention is preferably in the form of a sheet.

[0027] Such a solar cell encapsulant can provide a solar cell encapsulant that can be sealed using a vacuum laminator that is widely used in the production of solar cell modules. [Effects of the Invention]

[0028] According to the present invention, solar cells can be sealed at low temperatures, which prevents deformation and enables the manufacture of solar cell modules without reducing the initial output of solar cells such as perovskite solar cells, whose output is significantly affected by heat. Furthermore, according to the present invention, solar cell modules can be easily manufactured using a vacuum laminator or the like. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a schematic vertical cross-sectional view showing an example of a perovskite solar cell module according to the present invention. [Figure 2] FIG. 2 is a schematic vertical cross-sectional view showing another example of a perovskite solar cell module according to the present invention. [Figure 3] 1A to 1C are schematic vertical cross-sectional views showing the manufacturing process of a perovskite solar cell module according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] As described above, there has been a need for the development of a solar cell module that can be sealed at low temperatures, does not cause deformation due to heat or a decrease in solar cell output, and can be sealed using a conventional vacuum heating laminator.

[0031] As a result of investigations conducted by the present inventors to achieve the above-mentioned object, they discovered that by using a silicone rubber composition that is cured by a photoactivated hydrosilylation reaction catalyst as a solar cell encapsulant, it is possible to easily obtain a solar cell module without causing a decrease in the power generation capacity of the solar cell, and they completed the present invention.

[0032] That is, the present invention is a solar cell module comprising a solar cell and a silicone rubber sealing layer, wherein the silicone rubber sealing layer is a cured product of a silicone rubber composition containing a photoactivated hydrosilylation reaction catalyst.

[0033] The present invention also provides A solar cell encapsulant, (A) 100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 to 10,000 and having two or more alkenyl groups bonded to silicon atoms in each molecule (B) Specific surface area measured by the BET method is 50 to 500 m 2 Reinforcing silica: 10 to 150 parts by mass / g (C) an organohydrogenpolysiloxane having two or more hydrosilyl groups per molecule: an amount such that the number of hydrosilyl groups in the component (C) is 0.5 to 5 moles per mole of alkenyl groups in the component (A). and (D) Photoactivatable hydrosilylation catalyst: 0.5 to 1,000 ppm in terms of platinum group metal mass relative to the component (A) The solar cell encapsulant is made of a silicone rubber composition containing the above.

[0034] The present invention will be described in detail below, but the present invention is not limited thereto.

[0035] [Solar cell module] The solar cell module according to the present invention will be described below using a perovskite solar cell module as an example, but the present invention can also be applied to solar cell modules other than perovskite solar cell modules in the same manner.

[0036] Figure 1 is a cross-sectional view showing the configuration of one embodiment of a perovskite solar cell module according to the present invention. Perovskite solar cell module 10 has a structure in which a silicone rubber sealing layer 3 is disposed on the back side of perovskite solar cells 2 laminated on the back surface of a light-receiving-surface light-transmitting substrate or light-receiving-surface light-transmitting film 1 so as to cover the perovskite solar cells 2, a rear substrate or rear film 4 is laminated on top of the silicone rubber sealing layer 3, and an edge sealant 5 is disposed at the edge of perovskite solar cell module 10. Silicone rubber sealing layer 3 is a cured product of a silicone rubber composition containing a photoactivated hydrosilylation reaction catalyst.

[0037] FIG. 2 is a cross-sectional view showing the configuration of another embodiment of a perovskite solar cell module according to the present invention. Perovskite solar cell module 11 comprises a silicone rubber sealing layer 3 disposed on a light-receiving surface light-transmitting substrate or film 1, and a perovskite solar cell 2 disposed on the silicone rubber sealing layer 3. Another silicone rubber sealing layer 3 is disposed on top of the perovskite solar cell 2 to cover the perovskite solar cell 2. A rear substrate or film 4 is laminated on top of the silicone rubber sealing layer 3, and an edge sealant 5 is disposed at the edge of perovskite solar cell module 11. In this case, perovskite solar cell 2 may be combined with another substrate or another solar cell. The rear substrate or film 4 may be transparent or opaque, and may be a film with water vapor barrier properties. The silicone rubber sealing layer 3 is a cured product of a silicone rubber composition containing a photoactivated hydrosilylation catalyst.

[0038] Here, the light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1 is a transparent member that is the side through which sunlight is incident, and is required to have long-term reliability in outdoor use, including transparency, weather resistance, and impact resistance. For example, an example of the light-receiving surface light-transmitting substrate is transparent glass, with blue plate glass or white plate tempered glass being preferred. As the light-receiving surface light-transmitting film, a light-transmitting film with high water vapor barrier properties is preferred, and a water vapor transmission rate (JIS Z0208:1976, condition B (40°C, 90% RH)) of 50 g / (m 2 It is preferable to apply materials of 10 g / (m 2 24h) or less is more preferable, and 5g / (m 2 It is more preferable that the time is 24 hours or less.

[0039] The perovskite solar cell 2 typically has an electron transport layer, a power generation layer formed of a perovskite compound, a hole transport layer, and a back electrode laminated on a light-transmitting substrate, but is not limited to this structure.

[0040] The silicone rubber sealing layer 3 is arranged so as to cover the perovskite solar cell 2 without any gaps, and is preferably made of silicone rubber that provides good adhesion between the light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1, the perovskite solar cell 2, and the rear substrate or rear film 4.

[0041] Furthermore, since the silicone rubber sealing layer 3 is flame retardant, it is possible to expand the range of applications for solar cell modules.

[0042] The thickness of the silicone rubber sealing layer 3 is preferably 0.1 to 3 mm, and more preferably 0.1 to 1 mm.

[0043] The rear substrate or rear film 4 is preferably a substrate such as glass or a rear film having high water vapor barrier properties. 2 It is preferable to apply materials of 10 g / (m 2 24h) or less is more preferable, and 5g / (m 2 It is more preferable that the time is 24 hours or less.

[0044] Other properties required for the rear substrate or rear film 4 include heat resistance, weather resistance, moisture resistance, voltage resistance, and ultraviolet resistance in order to withstand long-term usage environments, as well as adhesion to the silicone rubber sealing layer 3.

[0045] The rear substrate can be white plate glass, blue plate glass, or the like. Examples of rear films include laminated films in which the water vapor transmission rate is adjusted by combining a fluororesin film and a PET film, laminated films in which a thin metal film is combined with a PET film, and films in which a thin metal layer is vapor-deposited on a PEN film or the like to suppress water vapor transmission. The rear substrate or rear film 4 does not necessarily need to be transparent, but if it is light-transmitting, the resulting solar cell module can be used in a wider range of applications as a see-through type or a solar cell with excellent appearance.

[0046] When the light-receiving surface light-transmitting substrate or film 1 and the rear substrate or film 4 are both made of thin glass or film, it is possible to form a flexible solar cell.

[0047] Alternatively, the silicone rubber sealing layer 3 and the backside film 4 may be laminated in advance. In this case, the silicone rubber sealing layer 3 and the backside film 4 form an integrated laminated sheet, which can be handled simultaneously when sealing is performed using a vacuum heating laminator, thereby simplifying the manufacturing process.

[0048] When disposing the silicone rubber sealing layer 3, an edge sealant 5 may be disposed in parallel. In this case, the edge sealant 5 is preferably a resin with excellent water vapor barrier properties, such as butyl rubber or epoxy resin. As an example, the edge sealant 5 is disposed at the edge of the light-receiving surface light-transmitting substrate 1, and the perovskite solar cell cell2. In this case, the width of the edge sealant 5 is not particularly limited as long as it is positioned within the above-mentioned range. Since the silicone rubber sealing layer 3 is positioned inside the edge sealant 5, it needs to be matched to the inner size. Furthermore, the thickness of the edge sealant 5 is preferably matched to that of the silicone rubber sealing layer 3. When the edge sealant 5 is thermosetting, it can be formed simultaneously with the silicone rubber sealing layer 3 using a vacuum heating laminator. Alternatively, the silicone rubber sealing layer 3 can be disposed over the entire surface of the light-receiving surface light-transmitting substrate 1 to form a seal, and then the edge sealant 5 can be disposed on the outer peripheral side surface of the light-receiving surface light-transmitting substrate 1. The combination of the silicone rubber sealing layer 3 and the edge sealant 5 can be changed as appropriate depending on the configuration of the solar cell module, and is not limited to this example.

[0049] [Silicone rubber composition (solar cell encapsulant)] The silicone rubber sealing layer 3 is made of a cured product of a silicone rubber composition containing a photoactivatable hydrosilylation reaction catalyst.

[0050] The silicone rubber composition is not particularly limited as long as it contains a photoactivatable hydrosilylation reaction catalyst and is cured by irradiation with light, and is capable of forming a silicone rubber sealing layer at low temperatures and preventing deformation of the solar cell module and a decrease in output due to heat. However, a silicone composition containing the following components (A) to (D) is preferred.

[0051] (A) 100 parts by mass of an organopolysiloxane having a degree of polymerization of 100 to 10,000 and having two or more alkenyl groups bonded to silicon atoms in each molecule (B) Specific surface area measured by the BET method is 50 to 500 m 2 Reinforcing silica: 10 to 150 parts by mass / g (C) an organohydrogenpolysiloxane having two or more hydrosilyl groups per molecule: an amount such that the number of hydrosilyl groups in component (C) is 0.5 to 5 moles per mole of alkenyl groups in component (A). (D) Photoactivatable hydrosilylation catalyst: 0.5 to 1,000 ppm by mass of platinum group metal relative to component (A)

[0052] (A) Alkenyl group-containing organopolysiloxane The organopolysiloxane (A) preferably used in the silicone rubber composition has a degree of polymerization (or the number of silicon atoms in the molecule) of 100 to 10,000 and contains two or more alkenyl groups bonded to silicon atoms per molecule. The organopolysiloxane (A) is preferably a raw rubber-like component (i.e., a non-liquid component with high viscosity and no self-flowing properties) at room temperature (25°C). Silicone rubber compositions containing this alkenyl-containing organopolysiloxane as the main component are typically millable compositions (i.e., raw rubber-like components that can be uniformly kneaded under shear stress using a kneader such as a roll mill).

[0053] Examples of the alkenyl-containing organopolysiloxane of component (A) include those represented by the following average composition formula (I): R 1 a SiO (4-a) / 2 (I) (In formula (I), R 1 represent the same or different monovalent hydrocarbon groups having 1 to 12 carbon atoms, and a is a number from 1.95 to 2.05.

[0054] In the above average compositional formula (I), R 1 represent the same or different monovalent hydrocarbon groups having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms. Specific examples include alkyl groups such as methyl, ethyl, propyl, butyl, hexyl, and octyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; fluoroalkyl groups such as 3,3,3-trifluoropropyl; alkenyl groups such as vinyl, allyl, and propenyl; aryl groups such as cycloalkenyl, phenyl, and tolyl; and aralkyl groups such as benzyl and 2-phenylethyl. Of these, methyl, vinyl, phenyl, and trifluoropropyl groups are preferred, and methyl and vinyl groups are particularly preferred.

[0055] Specifically, the alkenyl-containing organopolysiloxane of component (A) is preferably an organopolysiloxane whose main chain is composed of repeating dimethylsiloxane units, or an organopolysiloxane in which diphenylsiloxane units having phenyl groups, vinyl groups, 3,3,3-trifluoropropyl groups, or the like, methylphenylsiloxane units, methylvinylsiloxane units, methyl-3,3,3-trifluoropropylsiloxane units, or the like have been introduced into part of the dimethylpolysiloxane structure composed of repeating dimethylsiloxane units that constitute the main chain.

[0056] The organopolysiloxane of component (A) has two or more (usually 2 to 50, particularly 2 to 20) alkenyl groups, preferably vinyl groups, in one molecule, and for example, all R 1 It is preferable that 0.01 to 10%, particularly 0.02 to 5%, of the groups are alkenyl groups.

[0057] The alkenyl groups may be bonded to silicon atoms at the molecular chain terminals, or to silicon atoms in the middle (non-terminal) of the molecular chain, or both, but it is preferable for the alkenyl groups to be bonded to silicon atoms at at least both molecular chain terminals. Specifically, it is preferable for the molecular chain terminals to be blocked with dimethylvinylsilyl groups, methyldivinylsilyl groups, trivinylsilyl groups, etc.

[0058] In the average composition formula (I), a is a number from 1.95 to 2.05, preferably from 1.98 to 2.02, and more preferably from 1.99 to 2.01. The molecular structure of the alkenyl-containing organopolysiloxane of component (A) is basically such that the main chain is made up of diorganosiloxane units (R 1 2SiO 2 / 2 ) repeating units, and both ends of the molecular chain are triorganosiloxy groups (R 1 3SiO 1 / 2 ) in the main chain, but it is possible to have a small amount of branching units (R 1 SiO 3 / 2) may be a branched structure containing (R 1 is the same as above).

[0059] Preferred examples of the organopolysiloxane of component (A) include those in which the molecular chain terminals are blocked with triorganosiloxy groups such as trimethylsiloxy groups, dimethylphenylsiloxy groups, dimethylhydroxysiloxy groups, dimethylvinylsiloxy groups, methyldivinylsiloxy groups, and trivinylsiloxy groups. Particularly preferred examples include methylvinylpolysiloxane, methylphenylvinylpolysiloxane, and methyltrifluoropropylvinylpolysiloxane.

[0060] The degree of polymerization of the organopolysiloxane of component (A) is 100 to 10 ,000 is preferable, and 3,000 to 1 0,000. Within this range, the rubber strength and handling properties are superior. In this specification, the degree of polymerization is a value calculated as a weight-average degree of polymerization from the average molecular weight in terms of polystyrene by gel permeation chromatography (GPC) analysis measured under the following conditions.

[0061] [GPC measurement conditions] Developing solvent: toluene Flow rate: 0.6mL / min Detector: Refractive index detector (RI) Column: TSK Guardcolumn SuperH-H TSKgel SuperH5000(6.0mmI.D.×15cm×1) TSKgel SuperH4000(6.0mmI.D.×15cm×1) TSKgel SuperH3000(6.0mmI.D.×15cm×1) (All manufactured by Tosoh Corporation) Column temperature: 40℃ Sample injection volume: 50 μL (0.5% by mass toluene solution)

[0062] The alkenyl group-containing organopolysiloxane of component (A) may use either a single type, or a combination of two or more types with different molecular structures or degrees of polymerization.

[0063] The alkenyl group-containing organopolysiloxane of component (A) can be obtained by known methods, such as (co)hydrolyzing and condensing one or more organohalogenosilanes, or by ring-opening polymerization of a cyclic polysiloxane using an alkaline or acidic catalyst.

[0064] (B) Reinforcing silica The reinforcing silica (B), which is preferably used in the silicone rubber composition, is added to obtain a silicone rubber composition with excellent mechanical strength before and after curing. The specific surface area of ​​component (B), measured by the BET method, is 50 to 500 m from the viewpoint of the mechanical strength and transparency of the silicone rubber composition. 2 / g, and 200 to 500m 2 / g, and particularly preferably 250 to 500m 2 Within this range, it is possible to obtain a sealing layer that is highly transparent and excellent in processability in the production of a solar cell module, and that has excellent mechanical strength before and after curing.

[0065] Examples of the reinforcing silica of component (B) include fumed silica (dry silica or fumed silica) and precipitated silica (wet silica). These silicas whose surfaces have been hydrophobized with chlorosilane, alkoxysilane, hexamethyldisilazane, or the like are also suitable. Treatment with hexamethyldisilazane is particularly preferred, as it increases transparency. To enhance transparency, it is preferable to use fumed silica as the reinforcing silica. The reinforcing silica may be used alone or in combination of two or more types.

[0066] The reinforcing silica of component (B) can be a commercially available product, and examples thereof include the Aerosil series (manufactured by Nippon Aerosil Co., Ltd.), such as Aerosil 130, Aerosil 200, Aerosil 300, Aerosil R-812, Aerosil R-972, and Aerosil R-974; Cabosil MS-5, MS-7 (manufactured by Cabot Corporation); Reolosil QS-102, 103, and MT-10 (manufactured by Tokuyama Corporation); and surface-untreated or surface-hydrophobized (i.e., hydrophilic or hydrophobic) fumed silica; and surface-untreated or surface-hydrophobized precipitated silica, such as Tokusil US-F (manufactured by Tokuyama Corporation), NIPSIL-SS, and NIPSIL-LP (manufactured by Nippon Silica Industry Co., Ltd.).

[0067] The amount of reinforcing silica (B) blended is preferably 10 to 150 parts by mass, more preferably 30 to 90 parts by mass, and even more preferably 50 to 90 parts by mass per 100 parts by mass of the organopolysiloxane (A). When the amount of component (B) blended is 10 parts by mass or more, the reinforcing effect before and after curing is easily obtained, and the transparency of the silicone rubber composition after curing is not reduced. When the amount is 150 parts by mass or less, the silica is well dispersed in the silicone rubber composition, and the silicone rubber composition has excellent processability when processed into a sheet.

[0068] (C) Organohydrogenpolysiloxane The component (C) that is preferably used in the silicone rubber composition is an organohydrogenpolysiloxane having at least two, and preferably three or more, hydrogen atoms (hydrosilyl groups) bonded to silicon atoms in each molecule, and is preferably an organohydrogenpolysiloxane that is liquid at room temperature and is represented by the following average composition formula (II): R 2 b H c SiO (4-b-c) / 2 (II) (In formula (II), R 2 are each independently the same or different, unsubstituted or substituted monovalent hydrocarbon groups having 1 to 10 carbon atoms; b is a number that satisfies 0.7 to 2.1, c is a number that satisfies 0.001 to 1, and b+c is a number that satisfies 0.8 to 3.

[0069] In formula (II), R 2 The unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms is preferably an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms and not having an aliphatic unsaturated bond, and specific examples include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, and hexyl, cyclohexyl, phenyl, 3,3,3-trifluoropropyl, and cyanomethyl, with methyl, propyl, and phenyl being preferred.

[0070] In formula (II), b is a number that satisfies 0.7 to 2.1, preferably 0.8 to 2.0, c is a number that satisfies 0.001 to 1, preferably 0.01 to 1, and b+c is a number that satisfies 0.8 to 3.0, preferably 0.9 to 2.7.

[0071] The organohydrogenpolysiloxane of component (C) has at least two hydrosilyl groups (e.g., 2 to 300), preferably three or more (e.g., 3 to 200), and more preferably four or more (e.g., 4 to 100) per molecule. These may be located at the molecular chain terminals, along the molecular chain (non-terminal), or both. Furthermore, the number of silicon atoms (or degree of polymerization) per molecule of this organohydrogenpolysiloxane is generally 2 to 300, preferably 3 to 200, and more preferably 4 to 100. The viscosity at 25°C is preferably 0.5 to 1,000 mPa·s, more preferably 1 to 500 mPa·s, and particularly preferably 5 to 300 mPa·s. This viscosity is measured at 25°C using a rotational viscometer according to JIS K 7117-1:1999.

[0072] Specific examples of the organohydrogenpolysiloxane of component (C) include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, methylhydrogencyclopolysiloxane, methylhydrogensiloxane-dimethylsiloxane cyclic copolymer, tris(dimethylhydrogensiloxy)methylsilane, tris(dimethylhydrogensiloxy)phenylsilane, methylhydrogenpolysiloxane capped at both ends with trimethylsiloxy groups, dimethylsiloxane-methylhydrogensiloxane copolymer capped at both ends with trimethylsiloxy groups, and methylhydrogenpolysiloxane capped at both ends with dimethylsiloxy groups. Dimethylpolysiloxane capped with phenylsiloxy groups, copolymer of dimethylsiloxane and methylhydrogensiloxane capped with dimethylhydrogensiloxane at both ends, copolymer of methylhydrogensiloxane and diphenylsiloxane capped with trimethylsiloxy groups at both ends, copolymer of methylhydrogensiloxane, diphenylsiloxane and dimethylsiloxane capped with trimethylsiloxy groups at both ends, cyclic methylhydrogenpolysiloxane, copolymer of cyclic methylhydrogensiloxane and dimethylsiloxane, copolymer of cyclic methylhydrogensiloxane, diphenylsiloxane and dimethylsiloxane, (CH3)2HSiO 1 / 2 Units and SiO 4 / 2 A copolymer consisting of (CH3)2HSiO units 1 / 2 Units and SiO 4 / 2 Units and (C6H5)SiO 3 / 2 and copolymers consisting of units, and the above-mentioned exemplary compounds in which some or all of the methyl groups have been substituted with other alkyl groups such as ethyl groups and propyl groups, or aryl groups such as phenyl groups.

[0073] The amount of the organohydrogenpolysiloxane of the component (C) blended is preferably 0.1 to 30 parts by mass, and more preferably 0.3 to 10 parts by mass, per 100 parts by mass of the alkenyl group-containing organopolysiloxane of the component (A).

[0074] Furthermore, in terms of the rubber properties of the silicone rubber composition, the organohydrogenpolysiloxane can be blended so that the molar ratio of hydrosilyl groups to the total alkenyl groups in component (A) is preferably in the range of 0.5 to 5, more preferably in the range of 0.8 to 3, and can also be in the range of 1 to 2.5. Within this range, a sealing layer with a hardness appropriate for the production of a solar cell module can be obtained.

[0075] (D) Photoactivatable hydrosilylation catalyst The photoactivatable hydrosilylation catalyst of component (D) is a catalyst that promotes crosslinking through a hydrosilylation reaction between the alkenyl groups in component (A) and the hydrosilyl groups in component (C) upon irradiation with light such as ultraviolet light.

[0076] Known photoactivatable hydrosilylation catalysts can be used, and examples thereof include (1,5-cyclooctadienyl)diphenyl platinum complex, (1,5-cyclooctadienyl)dipropyl platinum complex, (2,5-norboradiene)dimethyl platinum complex, (2,5-norboradiene)diphenyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methylcyclopentadienyl)diethyl platinum complex, (trimethylsilylcyclopentadienyl)diphenyl platinum complex, (methylcycloocta-1,5-dienyl)diethyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methylcyclopentadienyl)diethyl platinum complex, (methylcycloocta-1,5-dienyl)diethyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methyl ... One or more compounds selected from the group consisting of (cyclopentadienyl)trimethylplatinum complex, (cyclopentadienyl)ethyldimethylplatinum complex, (cyclopentadienyl)acetyldimethylplatinum complex, (methylcyclopentadienyl)trimethylplatinum complex, (methylcyclopentadienyl)trihexylplatinum complex, (trimethylsilylcyclopentadienyl)trimethylplatinum complex, (dimethylphenylsilylcyclopentadienyl)triphenylplatinum complex, (cyclopentadienyl)dimethyltrimethylsilylmethylplatinum complex, and bis(β-diketonato)platinum complex can be used.

[0077] The amount of the photoactivated hydrosilylation catalyst (D) can be a catalytic amount, and is typically 0.5 to 1,000 ppm, and more preferably 1 to 500 ppm, calculated as platinum metal mass relative to component (A). This range provides excellent curing properties and prevents a decrease in the power generation efficiency of the solar cell module due to catalyst-induced yellowing of the silicone rubber composition.

[0078] Other ingredients In addition to the components (A) to (D), the silicone rubber composition may contain an addition reaction inhibitor for the purpose of adjusting the curing rate or pot life. Specific examples of addition reaction inhibitors include ethynylcyclohexanol and tetramethyltetravinylcyclotetrasiloxane.

[0079] [Method of manufacturing silicone rubber composition] The silicone rubber composition can be obtained by kneading the above-mentioned components using a two-roll mill, kneader, Banbury mixer, or the like.

[0080] The plasticity of the silicone rubber composition before curing (unvulcanized state) is preferably 150 to 1,000, more preferably 200 to 800, and even more preferably 250 to 600. When the plasticity is greater than 150, the composition can easily maintain its shape and is easy to handle without becoming too tacky. When the plasticity is 1,000 or less, the composition can be easily formed into a sheet with good cohesion. The plasticity can be measured in accordance with JIS K6249:2003.

[0081] The silicone rubber composition can be molded into a sheet and used as a solar cell encapsulant, which can be encapsulated using a vacuum laminator that is widely used in the manufacture of solar cell modules. The sheet molding method is not particularly limited, but extrusion molding, calendar molding, etc. can be used. In this case, the thickness of the silicone rubber composition sheet is preferably 0.1 to 3 mm, and more preferably 0.1 to 1 mm.

[0082] [Solar cell module manufacturing method] The solar cell module of the present invention comprises: Step (i): Preparing a silicone rubber composition Step (ii): Irradiating the silicone rubber composition with ultraviolet light and Step (iii): A step of laminating the UV-irradiated silicone rubber composition and the solar cell, and pressing them at a temperature of 20 to 100°C to form a silicone rubber sealing layer. The composition can be produced by a production method including the steps of:

[0083] Step (i) is a step of preparing a silicone composition. The silicone composition preferably contains the above-mentioned components (A) to (D) in the above-mentioned ratio. In this step, it is preferable to prepare a sheet-like silicone rubber composition, from the viewpoint of facilitating vacuum lamination in step (iii).

[0084] Step (ii) is a step of irradiating the silicone rubber composition with ultraviolet light. By irradiating the silicone rubber composition with ultraviolet light in this step, the silicone rubber composition may be cured to an extent that a silicone rubber sealing layer can be formed by pressing in step (iii).

[0085] Examples of the ultraviolet irradiation method include a method in which an appropriate amount of ultraviolet light is irradiated using a 365 nm UV-LED lamp, a metal halide lamp, or the like as an ultraviolet light source.

[0086] For ultraviolet irradiation, light having a wavelength of preferably 200 to 500 nm, more preferably 200 to 350 nm is used. From the viewpoints of curing speed and prevention of discoloration, the irradiation temperature is preferably 20 to 80°C, and the irradiation intensity is preferably 30 to 2,000 mW / cm. 2 The irradiation dose is preferably 150 to 10,000 mJ / cm 2 is preferred.

[0087] Step (iii) is a step in which the UV-irradiated silicone rubber composition and the solar cell are laminated together and pressed at a temperature of 20 to 100°C to form a silicone rubber sealing layer.

[0088] In step (iii), it is preferable to perform pressing while heating under vacuum (reduced pressure) by vacuum lamination treatment using a vacuum laminator. For example, a silicone rubber sealing layer can be formed by a method such as that shown in FIG. 3.

[0089] First, a silicone rubber composition sheet 6 irradiated with ultraviolet light in step (ii) is prepared ((1) in Figure 3), and this is placed on a light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1 ((2) in Figure 3). Next, a perovskite solar cell 2 is placed on the silicone rubber composition sheet 6 so that the light-receiving surface side is oriented toward the underlying light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1 ((3) in Figure 3). The silicone rubber composition sheet 6 irradiated with ultraviolet light in step (ii) is placed on top of this ((4) in Figure 3), and a back substrate or back film 4 is placed on top of that to form a temporary laminate ((5) in Figure 3). Next, this temporary laminate (in which the perovskite solar cell 2 and the silicone rubber composition sheet 6 are temporarily laminated between the light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1 and the back substrate or back film 4) is pressed using a vacuum laminator, for example, at a reduced pressure of 20 to 100°C, preferably 60 to 100°C, for 20 to 60 minutes, whereby the silicone rubber composition sheet 6 hardens to become the silicone rubber sealing layer 3, which is fixed to and integrated with the light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1, the back substrate or back film 4, and the perovskite solar cell 2. This results in a perovskite solar cell module 12 (step (6) in FIG. 3).

[0090] If the temperature during pressing is 20°C or higher, the solar cell can be sealed more reliably with the silicone rubber sealing layer. If the temperature is 100°C or lower, deformation and output reduction due to heat can be prevented more reliably.

[0091] In the method for manufacturing a solar cell module of the present invention, the silicone rubber composition may be cured in either step (ii) or step (iii), or in both. That is, the curing of the composition may be completed by UV irradiation in step (ii), and then only pressing at room temperature may be performed in step (iii). Alternatively, the composition may be heat-cured when the uncured composition is pressed in step (iii). Alternatively, the composition may be in a semi-cured state in step (ii), and then heat-cured simultaneously with pressing in step (iii) to complete the curing of the composition. [Example]

[0092] EXAMPLES The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0093] <Preparation of Silicone Rubber Composition for Solar Cell Encapsulant and Fabrication of Silicone Rubber Composition Sheet> [Example 1-1] 100 parts by mass of an organopolysiloxane consisting of 99.85 mol% dimethylsiloxane units, 0.025 mol% methylvinylsiloxane units, and 0.125 mol% dimethylvinylsiloxane units, with an average degree of polymerization of approximately 6,000; a BET specific surface area of ​​300 m 2 70 parts by mass of silica (trade name Aerosil 300, manufactured by Nippon Aerosil Co., Ltd.) with a molecular weight of 1 / g, 16 parts by mass of hexamethyldisilazane as a dispersant, and 4 parts by mass of water were added, kneaded in a kneader, and heated at 170°C for 2 hours to prepare a compound. As a photoactivatable hydrosilylation catalyst, ( Methylcyclopentadienyl )A silicone rubber composition was prepared by mixing 2.5 parts by mass of a toluene solution of trimethylplatinum complex (platinum concentration 0.5% by mass, equivalent to 238 ppm of platinum group metals relative to the organopolysiloxane) and 0.3 parts by mass of a methylhydrogendimethylpolysiloxane (average degree of polymerization 40, hydrosilyl group amount 0.0074 mol / g) end-blocked at both ends with trimethylsiloxy groups and having an average of 20 hydrosilyl groups in the side chains (an amount such that the hydrosilyl groups were 2.1 moles per mole of alkenyl groups in the organopolysiloxane).Then, a silicone rubber composition sheet was formed to a thickness of 0.5 mm using a calendar roll.

[0094] [Comparative Example 1-1] 100 parts by mass of an organopolysiloxane consisting of 99.85 mol% dimethylsiloxane units, 0.025 mol% methylvinylsiloxane units, and 0.125 mol% dimethylvinylsiloxane units, with an average degree of polymerization of approximately 6,000; a BET specific surface area of ​​300 m 2 70 parts by mass of silica (trade name Aerosil 300, manufactured by Nippon Aerosil Co., Ltd.) with a molecular weight of 1 / g, 16 parts by mass of hexamethyldisilazane as a dispersant, and 4 parts by mass of water were added, kneaded in a kneader, and heated at 170°C for 2 hours to prepare a compound. 100 parts by mass of the above compound was mixed with 0.05 parts by mass of a xylene solution of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex (platinum concentration 1% by mass, 9 ppm in terms of platinum group metal mass relative to the organopolysiloxane), 0.025 parts by mass of ethynylcyclohexanol as a reaction inhibitor, and 0.3 parts by mass of a methylhydrogendimethylpolysiloxane (average polymerization degree 40, hydrosilyl group amount 0.0074 mol / g) end-blocked at both ends with trimethylsiloxy groups and having an average of 20 hydrosilyl groups in the side chains (an amount equivalent to 2.1 moles of hydrosilyl groups per mole of alkenyl groups in the organopolysiloxane) in a two-roll mill to produce a silicone rubber composition. A silicone rubber composition sheet with a thickness of 0.5 mm was then formed using a calendar roll.

[0095] <Manufacturing and evaluation of solar cell modules> [Examples 2-1 to 2-3] The silicone rubber composition sheet obtained in Example 1-1 was left to stand for 3 days at 25°C, 50% RH, and with ultraviolet light blocked, and then exposed to UV light with a wavelength of 365 nm at a dose of 6,000 mJ / cm using an ultraviolet irradiation device. 2 The samples were prepared by irradiation with .

[0096] As shown in FIG. 3, a white glass plate (size 100×100 mm, thickness 3.2 mm) was prepared as the light-receiving surface light-transmitting substrate 1, and the above-mentioned silicone rubber composition sheet (size 100×100 mm, thickness 0.5 mm) after ultraviolet irradiation was placed on top of it as the silicone rubber composition sheet 6. A perovskite solar cell 2 (size 50×50 mm, thickness 1 mm) was then placed on top of it, with the light-receiving surface facing the lower white glass plate, and the silicone rubber Composition sheet The silicone rubber composition sheet 6 (size 100 × 100 mm, thickness 0.5 mm) after UV irradiation was placed on top of that, and a white glass plate (size 100 × 100 mm, thickness 3.2 mm) was placed on top of that as the back substrate 4, thereby obtaining a temporary laminate.

[0097] Next, this temporary laminate was pressed under vacuum using a vacuum laminator device at temperature conditions of 60°C (Example 2-1), 80°C (Example 2-2), and 100°C (Example 2-3) for 30 minutes each to produce a perovskite solar cell module 12.

[0098] [Comparative Examples 2-1 to 2-5] A temporary laminate was obtained in the same manner as in Examples 2-1 to 2-3 above, except that the silicone rubber composition sheet obtained in Comparative Example 1-1 was used as the silicone rubber composition sheet 6.

[0099] Next, this temporary laminate was pressed under vacuum using a vacuum laminator at temperatures of 60°C (Comparative Example 2-1), 80°C (Comparative Example 2-2), 100°C (Comparative Example 2-3), 120°C (Comparative Example 2-4), and 140°C (Comparative Example 2-5) for 30 minutes each to produce perovskite solar cell modules.

[0100] [Comparative Examples 2-6 to 2-10] Solar cell modules were produced in the same manner as in Comparative Examples 2-1 to 2-5 above, except that the silicone rubber composition sheet 6 was replaced with an EVA (ethylene-vinyl acetate copolymer) sheet (100×100 mm, thickness 0.45 mm).

[0101] [Coating] For the solar cell modules obtained in Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-10, coverage of the perovskite solar cell 2 was visually confirmed, and a state in which no voids remained in the step portions and electrode portions of the perovskite solar cell was rated as ◯ (good), and a state in which voids remained in the step portions and electrode portions of the perovskite solar cell was rated as × (bad). The results are shown in Table 1.

[0102] [Output maintenance rate] Among the solar cell modules obtained in Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-10, those for which the coverage was good (good) were evaluated for the output (W 1 ) was measured using a simulated solar irradiation device, and the output (W 0 The output maintenance rate (%) for each output was calculated using the following formula. An output maintenance rate of 90% or more was evaluated as ◯, Less than 90% A value of 80% or more was rated as △, and a value of less than 80% was rated as ×. The results are shown in Table 1. Output maintenance rate (%) = W 1 / W 0 ×100

[0103] [Table 1]

[0104] As shown in Table 1, in Examples 2-1 to 2-3, the silicone rubber composition sheet obtained in Example 1-1 was used as a solar cell encapsulant, and good results were obtained in both cell coverage and output retention even at low lamination temperatures of 100°C or less.

[0105] Furthermore, when the silicone rubber composition sheet of Comparative Example 1-1, which is a thermosetting composition that does not use a photoactivated hydrosilylation reaction catalyst, was used as a solar cell encapsulant (Comparative Examples 2-1 to 2-5), the solar cell coverage by the lamination process was insufficient even at higher temperatures.

[0106] Furthermore, as shown in Comparative Examples 2-6 to 2-9, when an EVA sheet was used as the solar cell encapsulant, the EVA did not melt sufficiently at temperatures between 60°C and 120°C, resulting in poor solar cell coverage by lamination. On the other hand, at 140°C (Comparative Example 2-10), solar cell coverage was good, but the heat resistance limit of the perovskite solar cell was exceeded, resulting in poor output of the resulting solar cell module.

[0107] The present invention is not limited to the above-described embodiments, which are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present invention and that provides similar effects is included within the technical scope of the present invention. [Explanation of symbols]

[0108] 1...Light-transmissive substrate for light-receiving surface / light-transparent film for light-receiving surface, 2...Perovskite solar cell, 3...Silicone rubber sealing layer, 4...Rear substrate / rear film, 5...Edge seal material, 6...silicone rubber composition sheet, 10...perovskite solar cell module, 11...Perovskite solar cell module, 12...Perovskite solar cell module.

Claims

1. A method for manufacturing a solar cell module comprising a solar cell and a silicone rubber sealing layer, the silicone rubber sealing layer being a cured product of a silicone rubber composition containing a photoactivated hydrosilylation reaction catalyst, comprising: Step (i): preparing the silicone rubber composition Step (ii): Irradiating the silicone rubber composition with ultraviolet light and Step (iii): A step of laminating the UV-irradiated silicone rubber composition and the solar cell, and pressing them at a temperature of 20 to 60° C. to form the silicone rubber sealing layer. A method for manufacturing a solar cell module comprising the steps of:

2. The silicone rubber composition comprises: (A) Organopolysiloxane having a degree of polymerization of 100 to 10,000 and having two or more alkenyl groups bonded to silicon atoms in one molecule: 100 parts by mass (B) A specific surface area measured by the BET method is 50 to 500 m ２ / g reinforcing silica: 10 to 150 parts by mass (C) an organohydrogenpolysiloxane having two or more hydrosilyl groups per molecule: an amount such that the amount of hydrosilyl groups in the component (C) is 0.5 to 5 moles per mole of alkenyl groups in the component (A) (D) Photoactivatable hydrosilylation catalyst: 0.5 to 1,000 ppm by mass of platinum group metal relative to the component (A).

2. The method for producing a solar cell module according to claim 1, further comprising the step of:

3. The photoactivatable hydrosilylation catalyst is, for example, (1,5-cyclooctadienyl)diphenyl platinum complex, (1,5-cyclooctadienyl)dipropyl platinum complex, (2,5-norboradiene)dimethyl platinum complex, (2,5-norboradiene)diphenyl platinum complex, (cyclopentadienyl)dimethyl platinum complex, (methylcyclopentadienyl)diethyl platinum complex, (trimethylsilylcyclopentadienyl)diphenyl platinum complex, (methylcycloocta-1,5-dienyl)diethyl platinum complex, (cyclopentadienyl)trimethyl platinum complex, (cyclopentadienyl)ethyl dimethyl platinum 3. The method for producing a solar cell module according to claim 1, wherein the photoactivated hydrosilylation catalyst is one or more selected from the group consisting of a gold complex, a (cyclopentadienyl)acetyldimethylplatinum complex, a (methylcyclopentadienyl)trimethylplatinum complex, a (methylcyclopentadienyl)trihexylplatinum complex, a (trimethylsilylcyclopentadienyl)trimethylplatinum complex, a (dimethylphenylsilylcyclopentadienyl)triphenylplatinum complex, a (cyclopentadienyl)dimethyltrimethylsilylmethylplatinum complex, and a bis(β-diketonato)platinum complex.

4. The method for manufacturing a solar cell module according to any one of claims 1 to 3, wherein the solar cell is a perovskite type solar cell.

5. 5. The method for producing a solar cell module according to claim 1, wherein the silicone rubber composition prepared in the step (i) is in the form of a sheet.

6. The method for producing a solar cell module according to any one of claims 1 to 5, characterized in that the step (iii) is carried out using a vacuum laminator.

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