JP7697363B2 - Solar Cell Module - Google Patents

Description

The present invention relates to a solar cell element coating composition and a solar cell module.

In recent years, research and development has been conducted on flexible solar cells that emphasize cost reduction and design, solar cells with see-through properties, organic thin-film solar cells that are lightweight and easy to handle, and solar cells with a perovskite compound in the power generation layer that achieves both low cost and high efficiency (hereinafter referred to as "perovskite solar cells"). Perovskite solar cells can be manufactured at a lower cost than crystalline silicon solar cells and have high power generation efficiency. Perovskite solar cell elements are obtained by stacking 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 from the light-receiving side. In the so-called modularization process, which seals the above elements, a structure in which a sealant is applied to the back side of the back electrode and the backmost side is sealed with a substrate and a film has been considered. Various proposals have been made, such as a structure that uses glass or the like for the light-receiving side light-transmitting substrate and the backmost side substrate, and a flexible structure that uses a light-transmitting film on the light-receiving side and a film on the backmost side.

On the other hand, perovskite compounds are vulnerable to water vapor, and solar cells are exposed to harsh outdoor environments for long periods of time, so perovskite solar cell modules are required to block water vapor to a high degree.

For such electronic devices that are vulnerable to water vapor, various techniques for forming a barrier against water vapor on the element before the sealing process have been introduced. For example, Patent Document 1 introduces a three-layer barrier coating technique including silicon, oxygen, and carbon. A water vapor barrier film having flexibility and mechanical strength is formed by a plasma chemical vapor deposition (CVD) method, but the plasma CVD method is formed under vacuum in a CVD apparatus, and since it is necessary to place the device in a vacuum chamber and perform processing in a vacuum environment, it is difficult to increase the size of the device. At the same time, the process of vacuum and exposure to air are involved, which makes the process complicated and increases the cost. In addition, Patent Document 2 introduces a technique for forming a ZnO-SiO ₂ -Al ₂ O ₃ film by a direct current (DC) sputtering method. The DC sputtering method also requires a vacuum environment, and has the same problem in terms of the complicated process.

JP 2014-100806 A JP 2013-147710 A

The present invention has been made in consideration of the above circumstances, and aims to provide a solar cell element coating composition that can be applied directly to solar cells in organic thin-film solar cells, perovskite solar cells, etc., cures under atmospheric pressure, and forms a protective film with high water vapor barrier properties.

As a result of intensive research aimed at solving the above problems, the inventors discovered that the solar cell element coating composition described below can be applied directly onto a solar cell, cures under atmospheric pressure, and provides a protective film with high water vapor barrier properties, thus completing the present invention.

［式中、Ｘは、それぞれ独立して下記構造式（２）で表される２価の基であり、Ｙは、それぞれ独立して下記構造式（３）～（５）のいずれかで表される１価の基であり、Ｙ’は、それぞれ独立して下記構造式（６）または（７）で表される２価の基であり、Ｍｅは、メチル基を表す。ｍは、０～１２の整数である。

（式中、アスタリスク（＊）は、ケイ素原子との結合部位を示す。）

（式（３）～（７）中、アスタリスク（＊）は、ケイ素原子との結合部位を示し、各不斉炭素における立体配置は、シス（エキソ）またはトランス（エンド）のいずれであってもよい。）］
（Ｂ）１分子中に、末端ケイ素原子に結合した水素原子を少なくとも３個有する有機ケイ素化合物、および、
（Ｃ）波長２００～５００ｎｍの光によって活性化される白金族金属触媒
を含有し、
かつ、ＨＲＳｉＯ_2/2（式中、Ｒは有機基を表す。）で表されるオルガノハイドロジェンシロキサン単位を有しない太陽電池素子コーティング組成物、
２． 前記（Ｂ）成分が、下記式（Ｉ）で表される化合物、下記式（ＩＩ）で表される、フェニルトリビニルシランと１，４－ビス（ジメチルシリル）ベンゼンとの付加反応生成物、またはその両方を含む１の太陽電池素子コーティング組成物、

（式（II）中、ｎは、１～２０の整数である。）
３． 前記（Ｃ）成分が、（η⁵－シクロペンタジエニル）三脂肪族白金化合物またはビス（β－ジケトナト）白金化合物を含む１または２の太陽電池素子コーティング組成物、
４． 太陽電池素子と、１～３のいずれかの太陽電池素子コーティング組成物の硬化物からなる水蒸気バリア層とを具備する太陽電池モジュール、
５． 前記太陽電池素子が、有機薄膜型またはペロブスカイト型の太陽電池素子である４の太陽電池モジュール、
６． １～３のいずれかの太陽電池素子コーティング組成物を、太陽電池素子に直接または層を介して接触させ、大気圧下で波長２００～５００ｎｍの光照射により硬化させる工程を有する太陽電池モジュールの製造方法
を提供する。 That is, the present invention provides
1. (A) A polymer represented by the following structural formula (1):

[In the formula, X is a divalent group represented by the following structural formula (2), Y is a monovalent group represented by any one of the following structural formulas (3) to (5), Y' is a divalent group represented by the following structural formula (6) or (7), Me represents a methyl group, and m is an integer from 0 to 12.

(In the formula, an asterisk (*) indicates a bonding site with a silicon atom.)

(In formulas (3) to (7), an asterisk (*) indicates a bonding site with a silicon atom, and the configuration at each asymmetric carbon may be either cis (exo) or trans (endo).)
(B) an organosilicon compound having at least three hydrogen atoms bonded to terminal silicon atoms in one molecule, and
(C) containing a platinum group metal catalyst that is activated by light having a wavelength of 200 to 500 nm;
and a solar cell element coating composition that does not have an organohydrogensiloxane unit represented by HRSiO _2/2 (wherein R represents an organic group);
2. The solar cell element coating composition according to claim 1, wherein the component (B) includes a compound represented by the following formula (I), an addition reaction product of phenyltrivinylsilane and 1,4-bis(dimethylsilyl)benzene represented by the following formula (II), or both of them.

(In formula (II), n is an integer from 1 to 20.)
3. The solar cell element coating composition of 1 or 2, wherein the component (C) contains a (η ⁵ -cyclopentadienyl) trialiphatic platinum compound or a bis(β-diketonato)platinum compound;
4. A solar cell module comprising a solar cell element and a water vapor barrier layer made of a cured product of the solar cell element coating composition according to any one of 1 to 3.
5. The solar cell module according to 4, wherein the solar cell element is an organic thin film type or a perovskite type solar cell element.
6. Provided is a method for producing a solar cell module, comprising the steps of contacting a solar cell element coating composition according to any one of 1 to 3 with a solar cell element directly or through a layer, and curing the composition by irradiation with light having a wavelength of 200 to 500 nm under atmospheric pressure.

The solar cell element coating composition of the present invention can be applied directly onto a solar cell, and is cured under atmospheric pressure to give a cured product with high water vapor barrier properties.
The solar cell element coating composition of the present invention having such properties is useful as a protective film for organic thin-film solar cells, perovskite solar cells, and the like.

1 is a schematic vertical cross-sectional view showing an example of a perovskite solar cell module according to the present invention. FIG. 1 is a schematic vertical cross-sectional view showing a perovskite solar cell module produced in an example.

The present invention will be specifically described below.
[1] Component (A) The component (A) in the solar cell element coating composition of the present invention is a polymer represented by the following structural formula (1).

In formula (1), X is a divalent group represented by the following structural formula (2), Y is a monovalent group represented by any one of the following structural formulas (3) to (5), Y' is a divalent group represented by the following structural formula (6) or (7), and Me represents a methyl group (hereinafter the same).

（式中、アスタリスク（＊）は、ケイ素原子との結合部位を示す。）

(In the formula, an asterisk (*) indicates a bonding site with a silicon atom.)

（式（３）～（７）中、アスタリスク（＊）は、ケイ素原子との結合部位を示し、各不斉炭素における立体配置は、シス（エキソ）またはトランス（エンド）のいずれであってもよい。）

(In formulas (3) to (7), an asterisk (*) indicates a bonding site with a silicon atom, and the configuration at each asymmetric carbon may be either cis (exo) or trans (endo).)

The divalent group represented by the structural formula (6) or (7) above is not limited to the bonding direction as described above, and also includes structures obtained by rotating each structure 180° on the paper.

In addition, m is an integer between 0 and 12, and preferably between 1 and 5. If m exceeds 12, the liquid will become highly viscous at room temperature and will be difficult to handle.

The kinetic viscosity of component (A) is not particularly limited, but is preferably from 1,000 to 100,000 ^{mm 2} /s, and more preferably from 5,000 to 30,000 ^{mm 2} /s. In the present invention, the kinetic viscosity is the value measured at 23° C. using a Cannon-Fenske viscometer (the same applies hereinafter).

Component (A) can be prepared, for example, as an addition reaction product of (a): bis(dimethylsilyl)benzene and (b): vinylnorbornene according to known methods (e.g., JP 2005-133073 A).

Component (a) is an ortho-, meta-, or para-substituted bis(dimethylsilyl)benzene represented by the following structural formula (8), and may be a single structure or a mixture of two or more isomers.

Component (b) is 5-vinylbicyclo[2.2.1]hept-2-ene represented by the following structural formula (9), and may be a single structure or a mixture of two or more isomers.

The component (A) of the present invention can be obtained, for example, by subjecting 1 mole of component (a) having two SiH groups per molecule to an addition reaction with an excess of more than 1 mole and not more than 10 moles, preferably more than 1 mole and not more than 5 moles, of component (b) having two addition-reactive carbon-carbon double bonds per molecule in the presence of a hydrosilylation reaction catalyst.

As the hydrosilylation reaction catalyst, known catalysts can be used. For example, platinum-based catalysts such as carbon powder carrying platinum metal, platinum black, platinic chloride, chloroplatinic acid, reaction products of chloroplatinic acid and monohydric alcohols, complexes of chloroplatinic acid and olefins, platinum bisacetoacetate, etc.; platinum group metal catalysts such as palladium-based catalysts and rhodium-based catalysts, etc. are not particularly limited as to the addition reaction conditions, the use of solvents, etc., and the reaction may be carried out under known conditions.

As described above, when preparing component (A), a molar excess of component (b) is used relative to component (a), so that component (A) has two addition-reactive carbon-carbon double bonds per molecule that are derived from the structure of component (b).

When a component having an addition reactive carbon-carbon double bond is used as component (B) described below, the proportion of the addition reactive carbon-carbon double bonds derived from component (A) in the total addition reactive carbon-carbon double bonds in the composition of the present invention is preferably 20 to 100 mol %, more preferably 40 to 100 mol %.

The above component (A) may be used alone or in combination of two or more.

[2] Component (B) Component (B) in the solar cell element coating composition of the present invention is an organosilicon compound having at least three hydrogen atoms (hydrosilyl groups) bonded to terminal silicon atoms. Such terminal hydrosilyl groups have high reactivity in the hydrosilylation reaction, so that the formation of three-dimensional crosslinks proceeds quickly, giving a cured product with high hardness.
Component (B) is an organosilicon compound represented by the formula HRSiO _2/2 (wherein R represents an organic group) that does not have an organohydrogensiloxane unit (D ^H unit). Examples of such an organosilicon compound include a compound represented by formula (I) below, an addition reaction product of phenyltrivinylsilane and 1,4-bis(dimethylsilyl)benzene represented by formula (II) below, and a compound represented by formula (III) below.

（式（ＩＩ）中、ｎは１～２０、好ましくは１～１０の整数であり、破線は結合手を表す。）

(In formula (II), n is an integer of 1 to 20, preferably 1 to 10, and the dashed line represents a bond.)

There are no particular limitations on the kinetic viscosity of component (B), but it is preferably from 0.1 to 100,000 ^{mm 2} /s, more preferably from 0.1 to 3,000 mm ² /s, and even more preferably from 0.5 to 500 mm ² /s.

The amount of component (B) to be blended is preferably such that the number of hydrogen atoms bonded to silicon atoms per mole of addition-reactive carbon-carbon double bonds in component (A) in the composition is 0.5 to 1.5 moles, and more preferably 0.8 to 1.2 moles.

The above component (B) may be used alone or in combination of two or more.

[3] Component (C) The platinum group metal catalyst for hydrosilylation reactions of component (C) is inactive in the dark, and is converted into an active platinum catalyst upon irradiation with light having a wavelength of 200 to 500 nm, thereby promoting the hydrosilylation reaction between the addition-reactive carbon-carbon double bonds in component (A) and the silicon-bonded hydrogen atoms in component (B).

Specific examples of such component (C) include (η ⁵ -cyclopentadienyl) trialiphatic platinum compounds and derivatives thereof.
Among these, particularly preferred are cyclopentadienyltrimethylplatinum complex, methylcyclopentadienyltrimethylplatinum complex and derivatives thereof in which the cyclopentadienyl group is modified.
Bis(β-diketonato)platinum compounds are also suitable examples of the component (C), and among these, bis(acetylacetonato)platinum compounds and derivatives thereof in which the acetylacetonato group is modified are particularly suitable.

The amount of component (C) that can be added is not limited as long as it is an amount that promotes the curing (hydrosilylation reaction) of the composition, and is preferably an amount such that the platinum group metal atoms in this component are in the range of 0.01 to 500 ppm by mass, more preferably 0.05 to 100 ppm, and even more preferably 0.01 to 50 ppm, relative to the total mass of components (A) and (B) of the composition.

The above component (C) may be used alone or in combination of two or more.

[4] Component (D) If necessary, a reaction inhibitor as component (D) may be added to the solar cell element coating composition of the present invention in order to prevent thickening or gelation before heat curing when the composition is formulated or applied to a substrate.
Specific examples thereof include 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclohexanol, ethynylmethyldecylcarbinol, 3-methyl-3-trimethylsiloxy-1-butyne, 3-methyl-3-trimethylsiloxy-1-pentyne, 3,5-dimethyl-3-trimethylsiloxy-1-hexyne, 1-ethynyl-1-trimethylsiloxycyclohexane, bis(2,2-dimethyl-3-butynoxy)dimethylsilane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, and 1,1,3,3-tetramethyl-1,3-divinyldisiloxane.
Of these, 1-ethynylcyclohexanol, ethynylmethyldecylcarbinol, 3-methyl-1-butyn-3-ol, and bis(2,2-dimethyl-3-butynoxy)dimethylsilane are preferred.

The amount of component (D) is preferably 0.01 to 2.0 parts by mass, and more preferably 0.01 to 0.1 parts by mass, per 100 parts by mass of components (A) and (B) combined. If the amount is within this range, the reaction control effect is fully exerted.

The solar cell element coating composition of the present invention is substantially free of organohydrogensiloxane units (D ^H units) represented by HRSiO _2/2 (wherein R represents an organic group). Such side chain hydrosilyl groups are less reactive than the terminal hydrosilyl groups in component (B) and may hinder the progress of the addition reaction.

[5] Other Components The solar cell element coating composition of the present invention may contain other components, as exemplified below, in addition to the above-mentioned components (A) to (C) and the optional component (D), so long as the object of the present invention is not impaired.
Examples of such agents include adhesion promoters having one or more functional groups in one molecule, such as alkenyl groups, (meth)acrylic groups, carbonyl groups, epoxy groups, alkoxysilyl groups, and amide groups; thixotropy control agents such as fumed silica; reinforcing agents such as crystalline silica; antioxidants such as hindered phenols and hindered amines; light stabilizers; heat resistance improvers such as metal oxides and metal hydroxides; colorants such as titanium oxide; thermal conductivity-imparting fillers such as alumina and crystalline silica; viscosity adjusters such as non-reactive silicone oils having no reactive functional groups; conductivity-imparting agents such as metal powders of silver, gold, etc.; and pigments and dyes for coloring.

The solar cell element coating composition of the present invention has excellent light transmittance and is easy to obtain as a thin cured product, and is therefore suitable as a transparent protective material for organic thin-film solar cell elements, perovskite solar cell elements, and the like. By using the solar cell element coating composition of the present invention, it is possible to prepare a cured product having a thickness of, for example, 50 μm and a total light transmittance of 90% or more as measured by a method conforming to JIS K 7361-1:1997.

[6] Solar Cell Module FIG. 1 shows an example of a perovskite solar cell module according to the present invention.
Perovskite solar cell 10 is configured to include a light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1, a perovskite solar cell 2 laminated on the back surface of the light-receiving surface light-transmitting substrate, a water vapor barrier layer 3 formed ... and a back surface substrate or back surface film 5 laminated on the backmost portion on the sealing material 4.

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. Specific examples of this light-receiving surface light-transmitting substrate 1 include transparent glass, with blue plate glass and white plate tempered glass being preferred. In addition, it is preferable to use a light-transmitting film with high water vapor barrier properties as the light-receiving surface light-transmitting film 1.

A perovskite solar cell 2 generally has a structure in which an electron transport layer, a power generation layer formed of a perovskite compound, a hole transport layer, and a back electrode are laminated on a light-receiving surface light-transmitting substrate or a light-receiving surface light-transmitting film 1, but is not limited to this structure.

The water vapor barrier layer 3 is applied to the back surface of the perovskite solar cell 2 so as to cover it without any gaps, and it is desirable that it adheres well to the light-receiving surface light-transmitting substrate or light-receiving surface light-transmitting film 1 and the perovskite solar cell 2.

The sealing material 4 placed on the back surface side of the perovskite solar cell 2 is preferably flexible, transparent, and durable.
The rear substrate 5 may be made of white plate glass, blue plate glass, or the like.
Examples of the back film 5 include films with controlled water vapor permeability, such as a laminated film combining a fluororesin film and a polyethylene terephthalate (PET) film, a laminated film combining a thin metal film and a PET film, and a film in which a thin metal layer is vapor-deposited onto a polyethylene naphthalate (PEN) film or the like.
When the rear substrate or rear film 5 has optical transparency, the resulting solar cell module becomes a see-through type, and the range of application can be expanded.

[7] Manufacturing method of solar cell module The solar cell element coating composition of the present invention can be directly contacted with a solar cell element and cured through a curing step to form a water vapor barrier layer. The contact method of the solar cell element coating composition is not particularly limited, but for example, a dispensing method, a casting method, a dipping method, a roll coating method, a spraying method, a screen printing method, etc. are possible. The film thickness of the water vapor barrier layer is not particularly limited, but for example, when applied to an organic thin-film solar cell and a perovskite solar cell, it is preferably 1 to 3,000 μm, more preferably 10 to 1,000 μm.
Furthermore, the solar cell element coating composition of the present invention may be applied via one or more other layers formed on the solar cell element, such as inorganic layers of SiO, SiN, AlO, etc., if necessary. When a plurality of layers are laminated on the solar cell element, it is also possible to use a cured product of the solar cell element coating composition of the present invention as a buffer film between the layers. Furthermore, a method of laminating a film obtained by curing the solar cell element coating composition of the present invention can be used.

When the solar cell element coating composition of the present invention is cured, the platinum group metal catalyst is activated by irradiation with light having a wavelength of 200 to 500 nm, preferably 200 to 370 nm. For the light irradiation, a UV-LED lamp, a metal halide lamp, a mercury lamp, or the like can be used.
From the viewpoint of the curing speed of the composition and prevention of discoloration, the irradiation intensity is preferably 30 to 2,000 mW/cm ² , and the irradiation dose is preferably 3,000 to 100,000 mJ/cm ^2. The temperature during irradiation is not particularly limited as long as it does not adversely affect the solar cell element, but is preferably 10 to 60°C, more preferably 20 to 40°C.

After the light irradiation, the solar cell element may be heated within a range that does not adversely affect the solar cell element. The heating temperature is preferably 50°C to 100°C, and more preferably 60°C to 80°C.
The heating time is preferably from 1 to 60 minutes, more preferably from 10 to 30 minutes.

The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In the following formulas, Me represents a methyl group and Ph represents a phenyl group.

[Examples 1-1 to 1-3, Comparative Examples 1-1 to 1-4]
The following components (A) to (D) were mixed in the amounts (parts by mass) shown in Table 1 to prepare a coating composition for a solar cell element.

Component (A) A mixture of polymers in which m in the above structural formula (1) is 1 to 5 (content of addition reactive carbon-carbon double bonds: 0.47 mol/100 g)

Component (B) (B-1): A compound represented by the following structural formula (I) (kinematic viscosity at 23° C.: 1.8 mm ² /s, content of silicon-bonded hydrogen atoms: 0.0092 mol/g)

（ｎ＝４～１０、破線は結合手を表す。） (B-2) An addition product of phenyltrivinylsilane and 1,4-bis(dimethylsilyl)benzene, which is a mixture of compounds represented by the following structural formulas (a) to (d) [(a):(b):(c):(d)=55:25:10:15 (molar ratio), kinetic viscosity at 23° C.: 30,000 mm ² /s, average content of silicon-bonded hydrogen atoms: 0.0035 mol/g]

(n=4 to 10, dashed lines represent bonds.)

（式中、括弧が付された各シロキサン単位の配列はランダム、交互、またはブロックである） (B-3) A compound represented by the following structural formula (kinematic viscosity at 23° C.: 21.4 mm ² /s, content of silicon-bonded hydrogen atoms: 0.0069 mol/g):

(wherein the arrangement of each bracketed siloxane unit is random, alternating, or block)

（式中、括弧が付された各シロキサン単位の配列はランダム、交互、またはブロックである） (B-4) A compound represented by the following structural formula (kinematic viscosity at 23° C.: 65 mm ² /s, content of silicon-bonded hydrogen atoms: 0.0116 mol/g):

(wherein the arrangement of each bracketed siloxane unit is random, alternating, or block)

Component (C) A toluene solution of methylcyclopentadienyltrimethylplatinum complex having a platinum content of 0.5% by mass.

Component (D): Bis(2,2-dimethyl-3-butynoxy)dimethylsilane

[Examples 2-1 to 2-3, Comparative Examples 2-1 to 2-4]
Using the solar cell element coating compositions obtained in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4, solar cell modules were produced according to the following procedure.

As shown in Figure 2, a transparent conductive film was formed on glass (size 50 x 50 mm, thickness 3.2 mm) as a light-receiving surface light-transmitting substrate 1, and further an electron transport layer, a perovskite layer, and a hole transport layer were provided on the top, and a positive electrode was formed on the top to obtain a perovskite solar cell 2. The perovskite layer was formed (size 25 x 25 mm) so as to be located at the center of the light-receiving surface light-transmitting substrate 1. Next, a fluororesin adhesive tape (thickness 0.25 mm, width 3 x 3 mm, Chukoh Chemical Industry Co., Ltd.) was provided as a dam material 6 on the outer periphery of the light-receiving surface light-transmitting substrate 1. Thereafter, the solar cell element coating composition of the present invention was applied to the perovskite solar cell 2 to a thickness of 0.1 mm, and leveled. Then, ultraviolet light was irradiated from above using a metal halide lamp (HANDY UV-100, manufactured by Oak Manufacturing Co., Ltd. (OCR)) at 25° C. from the outside, with an ultraviolet intensity of 10 mW/cm ² and an accumulated irradiation amount of 30,000 mJ/cm ^2. Thereafter, the solar cell element coating composition was cured by heating at 80° C. for 30 minutes, and a water vapor barrier layer 3 was obtained. Thereafter, a glass (size 50×50 mm, thickness 3.2 mm) serving as a rear substrate 5 was placed on top of the dam material 6, and the rear portion was fixed with polyimide tape 7 so that the rear substrate 5 would not come off, and a perovskite solar cell 11 was obtained.

The obtained perovskite solar cell was irradiated with light from the direction of the light-transmitting substrate 1 using a solar light simulator, and the initial output ( _W0 ) was measured. Then, the solar cell was exposed to an environment of 60°C and 90% RH for 500 hours, and the output ( _W1 ) was measured again by the same method, and the output maintenance rate (%) was calculated.
Output maintenance rate (%) = W ₁ /W ₀ ×100

As shown in Table 2, the perovskite solar cell modules having a water vapor barrier layer made of the solar cell element coating compositions of Examples 1-1 to 1-3 exhibit good output maintenance rates even when exposed to an environment of 60°C and 90% RH for 500 hours.
On the other hand, it is understood that the perovskite solar cell modules using the compositions of Comparative Examples 1-1 to 1-4 showed a significant decrease in output after being exposed to an environment of 60° C. and 90% RH for 500 hours.

Reference Signs List 1 Light-receiving surface light-transmitting substrate/light-receiving surface light-transmitting film 2 Perovskite solar cell 3 Water vapor barrier layer 4 Sealing material 5 Rear substrate/rear film 6 Dam material 7 Polyimide tape 10 Perovskite solar cell 11 Perovskite solar cell

Claims (6)

A solar cell element;
(A) A polymer represented by the following structural formula (1):

[In the formula, X is a divalent group represented by the following structural formula (2), Y is a monovalent group represented by any one of the following structural formulas (3) to (5), Y' is a divalent group represented by the following structural formula (6) or (7), Me represents a methyl group, and m is an integer from 0 to 12.

(In the formula, an asterisk (*) indicates a bonding site with a silicon atom.)

(In formulas (3) to (7), an asterisk (*) indicates a bonding site with a silicon atom, and the configuration at each asymmetric carbon may be either cis (exo) or trans (endo).)
(B) an organosilicon compound having at least three hydrogen atoms bonded to terminal silicon atoms in one molecule, and
(C) contains a platinum group metal catalyst that is activated by light having a wavelength of 200 to 500 nm, and the component (C) contains a (η ⁵ -cyclopentadienyl)trialiphatic platinum compound or a bis(β-diketonato)platinum compound;
and a water vapor barrier layer made of a cured product of a solar cell element coating composition that does not have an organohydrogensiloxane unit represented by HRSiO _2/2 (wherein R represents an organic group). 2. The solar cell module according to claim 1, wherein the component (B) comprises a compound represented by the following formula (I), an addition reaction product of phenyltrivinylsilane and 1,4-bis(dimethylsilyl)benzene represented by the following formula (II), or both:

(In formula (II), n is an integer from 1 to 20.) The solar cell module according to claim 1 or 2, wherein the solar cell element is an organic thin-film type or a perovskite type solar cell element. (A) A polymer represented by the following structural formula (1):

[In the formula, X is a divalent group represented by the following structural formula (2), Y is a monovalent group represented by any one of the following structural formulas (3) to (5), Y' is a divalent group represented by the following structural formula (6) or (7), Me represents a methyl group, and m is an integer from 0 to 12.

(In the formula, an asterisk (*) indicates a bonding site with a silicon atom.)

(In formulas (3) to (7), an asterisk (*) indicates a bonding site with a silicon atom, and the configuration at each asymmetric carbon may be either cis (exo) or trans (endo).)
(B) an organosilicon compound having at least three hydrogen atoms bonded to terminal silicon atoms in one molecule, and
(C) contains a platinum group metal catalyst that is activated by light having a wavelength of 200 to 500 nm, and the component (C) contains a (η ⁵ -cyclopentadienyl)trialiphatic platinum compound or a bis(β-diketonato)platinum compound;
The method for producing a solar cell module further comprises a step of contacting a solar cell element coating composition having no organohydrogensiloxane unit represented by HRSiO _2/2 (wherein R represents an organic group) with a solar cell element directly or through a layer, and curing the composition by irradiation with light having a wavelength of 200 to 500 nm under atmospheric pressure. 5. The method for producing a solar cell module according to claim 4, wherein the component (B) contains a compound represented by the following formula (I), an addition reaction product of phenyltrivinylsilane and 1,4-bis(dimethylsilyl)benzene represented by the following formula (II), or both:

(In formula (II), n is an integer from 1 to 20.) The method for manufacturing a solar cell module according to claim 4 or 5, wherein the solar cell element is an organic thin film type or a perovskite type solar cell element.

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