JP4467222B2 - Solar cell - Google Patents
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- JP4467222B2 JP4467222B2 JP2002051719A JP2002051719A JP4467222B2 JP 4467222 B2 JP4467222 B2 JP 4467222B2 JP 2002051719 A JP2002051719 A JP 2002051719A JP 2002051719 A JP2002051719 A JP 2002051719A JP 4467222 B2 JP4467222 B2 JP 4467222B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10559—Shape of the cross-section
- B32B17/10577—Surface roughness
- B32B17/10587—Surface roughness created by embossing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10651—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising colorants, e.g. dyes or pigments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
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- Photovoltaic Devices (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、表面側透明保護部材と裏面側保護部材との間に、接着フィルムを介して太陽電池用セルを封止してなる太陽電池であって、裏面側保護部材と太陽電池用セルとの間に介在させる接着フィルムとして着色エチレン酢酸ビニル共重合体樹脂（ＥＶＡ）フィルムを用い、表面側透明保護部材と太陽電池用セルとの間に介在させる接着フィルムとして透明ＥＶＡフィルムを用いた太陽電池に関する。
【０００２】
【従来の技術】
近年、資源の有効利用や環境汚染の防止等の面から、太陽光を直接電気エネルギーに変換する太陽電池が注目され、開発が進められている。
【０００３】
太陽電池は、一般に、図１に示す如く、表面側透明保護部材としてのガラス基板１と裏面側保護部材（バックカバー）２との間にＥＶＡ樹脂組成物を成膜してなるフィルム３Ａ，３Ｂの封止膜により、シリコン発電素子等の太陽電池用セル４を封止した構成とされている。なお、以下において、セルに対して受光面側に配置する封止膜を「表面側封止膜」と称し、セルの後方側に配置する封止膜を「裏面側封止膜」と称す。
【０００４】
このような太陽電池は、ガラス基板１、表面側封止膜用ＥＶＡフィルム３Ａ、太陽電池用セル４、裏面側封止膜用ＥＶＡフィルム３Ｂ及びバックカバー２をこの順で積層し、加熱加圧して、ＥＶＡを架橋硬化させて接着一体化することにより製造される。
【０００５】
このような太陽電池においては、太陽電池に入射した光をなるべく効率よく太陽電池用セルに集光することが発電効率の向上の面で強く望まれており、この目的のために、裏面側封止膜用ＥＶＡフィルム３Ｂとして、着色剤を含むＥＶＡ樹脂組成物を成膜してなる着色ＥＶＡフィルムを用いることが提案されている（例えば、特開平６−１７７４１２号公報）。
【０００６】
即ち、一般的な太陽電池にあっては、それ自体に入射光を集光する機能は付与されておらず、太陽電池の受光面から入射した光のうち、隣接する太陽電池用セル同士の間を通過する光や、薄膜セルよりなる太陽電池用セルを透過した光は、そのままバックカバーを通過して、発電に寄与することなく通り抜けてしまう。このため、発電に寄与する光は、太陽電池に入射した光のうち、直接太陽電池用セルに入射し、かつ、吸光された光に限定されるが、裏面側封止膜用ＥＶＡフィルムとして着色剤を含むものを用いると、この着色ＥＶＡフィルムと、表面側封止膜用の透明ＥＶＡフィルムとの界面における光の反射や着色剤による乱反射で、太陽電池用セル同士の間に入射した光や、セルを通過した光を乱反射し、再度セルに入射させることができるようになるため、太陽電池に入射した光の利用効率が高まり、発電効率が向上する。
【０００７】
なお、特開平６−１７７４１２号公報に記載される太陽電池では、裏面側封止膜用着色ＥＶＡフィルムと表面側封止膜用透明ＥＶＡフィルムとで、酢酸ビニル含有量が同一のＥＶＡよりなるものを組み合わせて用いている。
【０００８】
【発明が解決しようとする課題】
裏面側封止膜として着色ＥＶＡフィルムを用いた太陽電池にあっては、封止工程の加熱加圧の際に、図２に示す如く、着色ＥＶＡフィルムを構成する着色ＥＶＡ５が溶融、流動して太陽電池用セル４の受光面側に回り込み、太陽電池用セル４と透明ＥＶＡフィルムの透明ＥＶＡとの間に浸入する現象が起こり、太陽電池用セル４の辺縁部に汚れが付着したような状態となり、外観不良を生じる；この着色ＥＶＡが回り込んだ部分では太陽電池用セルが光を吸収し得ないため、性能が損なわれる；という問題があった。
【０００９】
また、着色ＥＶＡフィルムを裏面側封止膜として用いることにより、着色ＥＶＡフィルムによる光の反射効果で発電効率の向上を図ることができるが、より一層の反射効率の向上、発電効率の向上が望まれている。
【００１０】
従って、本発明は、裏面側封止膜として着色ＥＶＡフィルムを用いた太陽電池において、封止工程における太陽電池用セルの受光面側への着色ＥＶＡの回り込みを防止して、外観が良好で、高性能の太陽電池を提供することを目的とする。
【００１１】
本発明はまた、裏面側封止膜として着色ＥＶＡフィルムを用いた太陽電池において、着色ＥＶＡフィルムによる反射効率の向上効果を高め、より一層発電効率が向上された太陽電池を提供することを目的とする。
【００１２】
【課題を解決するための手段】
本発明の太陽電池は、表面側透明保護部材と裏面側保護部材との間に、接着フィルムを介して太陽電池用セルを封止してなる太陽電池であって、該裏面側保護部材と太陽電池用セルとの間に介在させる接着フィルムが、着色剤を含むエチレン酢酸ビニル共重合体樹脂組成物を成膜してなる着色ＥＶＡフィルムであり、該表面側透明保護部材と太陽電池用セルとの間に介在させる接着フィルムがエチレン酢酸ビニル共重合体樹脂組成物を成膜してなる透明ＥＶＡフィルムである太陽電池において、該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量よりも、該透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量が多く、該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ｂ重量％が１０〜４０重量％であり、該透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ａ重量％と、該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ｂ重量％との差（Ａ−Ｂ）が２〜８重量％であることを特徴とする。
【００１３】
裏面側封止膜としての着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量よりも、表面側封止膜としての透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量を多くすることにより、封止工程における太陽電池用セルの受光面側への着色ＥＶＡの回り込みを防止することができる。即ち、ＥＶＡの酢酸ビニル含有量はＥＶＡの加熱溶融時の流動性に相関し、酢酸ビニル含有量が多いと流動性が良く、流動し易くなり、酢酸ビニル含有量が少ないと流動性が悪く、流動し難くなる。
【００１４】
本発明では、着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量を透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量よりも少なくすることにより、透明ＥＶＡよりも着色ＥＶＡを流動し難くし、着色ＥＶＡの回り込みを防止する。
【００１５】
特に、透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ａ重量％は１０〜４０重量％で、着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ｂ重量％は１０〜４０重量％であることが好ましい。
【００１６】
また、該着色ＥＶＡフィルムは、前記太陽電池用セル側の面にエンボス加工が施されており、該エンボス加工により形成される凹部の深さがフィルムの厚みの２０〜９５％であることが好ましく、このように、太陽電池用セル側の面に深いエンボス加工を施した着色ＥＶＡフィルムであれば、着色ＥＶＡフィルムと透明ＥＶＡフィルムとの界面が粗れた凹凸面となり、光の反射効率が高められ、発電効率が向上する。
【００１７】
また、このような凹凸界面による光の乱反射で太陽電池の意匠性を高めることもできる。
【００１８】
この場合、表面側封止膜としての透明ＥＶＡフィルムの太陽電池用セル側の面にも、エンボス加工によりフィルムの厚みの２０〜９５％の深さの凹部が形成されていることが好ましい。
【００１９】
また、本発明において、透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂のＭＦＲ（メルトフローレート）の値ＲＡと着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂のＭＦＲの値ＲＢとの差（ＲＡ−ＲＢ）が１〜５０であることが好ましく、透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の融点ＭＡ℃と着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の融点ＭＢ℃との差（ＭＡ−ＭＢ）℃が０．１〜３０であることが好ましい。
【００２０】
なお、本発明におけるエンボス加工の凹部の深さ（以下、単に「深さ」と称す。）とは、図３におけるエンボス加工によるフィルム１０の凹凸面の凸部１１の最頂部１１Ａと凹部１２の最深部１２Ａとの高低差Ｄを指す。また、フィルムの厚みとは、フィルムの一方の面にエンボス加工を施してある場合、凸部１１の最頂部１１Ａからフィルムの裏面までの距離Ｔを示し、フィルムの双方の面にエンボス加工してある場合には、双方の面の凸部の先端同士の距離（フィルム厚さ方向の距離）を示す。以下において、フィルム１０の厚みＴに対する凹部１２の深さＤの割合（Ｄ／Ｔ ×１００（％））を「深さ率」と称す場合がある。
【００２１】
【発明の実施の形態】
以下に本発明の実施の形態を詳細に説明する。
【００２２】
本発明の太陽電池は、表面側封止膜として透明ＥＶＡフィルムを用い、裏面側封止膜として着色ＥＶＡフィルムを用いたものにおいて、透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量が着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量よりも多いこと以外は図１に示す従来の太陽電池と同様の構成とされている。
【００２３】
透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ａ重量％は、特に着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ｂ重量％よりも２〜８重量％多い、即ちＡ−Ｂ＝２〜８重量％である。この酢酸ビニル含有量差が８重量％よりも多いと、接着用ＥＶＡフィルムに好適な酢酸ビニル含有量を満たすことが困難となり、またこの酢酸ビニル含有量差が２重量％よりも少ないと、着色ＥＶＡフィルムの着色ＥＶＡの太陽電池用セルの受光面側への回り込みを確実に防止し得ない場合がある。
【００２４】
透明ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ａ重量％は特に１０〜４０重量％であることが好ましく、着色ＥＶＡフィルムを構成するＥＶＡの酢酸ビニル含有量Ｂ重量％は１０〜４０重量％である。この範囲よりも酢酸ビニル含有量が多いと、ＥＶＡが加熱溶融時に流動し易くなり、ガラス基板とバックカバーとの間からはみ出し易くなり、この範囲よりも酢酸ビニル含有量が少ないと、加工性が悪くなり、またＥＶＡフィルムが硬過ぎて封止時の脱気性が悪くなる。
【００２５】
本発明において、透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂のＭＦＲ値ＲＡと着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂のＭＦＲ値ＲＢとの差ＲＡ−ＲＢが１〜５０であることが好ましく、透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の融点ＭＡ℃と着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の融点ＭＢ℃との差（ＭＡ−ＭＢ）℃が０．１〜３０であることが好ましい。
【００２６】
以下に、本発明で用いる着色ＥＶＡフィルム及び透明ＥＶＡフィルムを構成するＥＶＡ樹脂組成物について説明する。
【００２７】
本発明で用いるＥＶＡ樹脂組成物には、耐候性の向上のために架橋剤を配合して架橋構造を持たせるが、この架橋剤としては、一般に、１００℃以上でラジカルを発生する有機過酸化物が用いられ、特に、配合時の安定性を考慮に入れれば、半減期１０時間の分解温度が７０℃以上であるものが好ましい。このような有機過酸化物としては、例えば２，５−ジメチルヘキサン；２，５−ジハイドロパーオキサイド；２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン；３−ジ−ｔ−ブチルパーオキサイド；ｔ−ジクミルパーオキサイド；２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキシン；ジクミルパーオキサイド；α，α’−ビス（ｔ−ブチルパーオキシイソプロピル）ベンゼン；ｎ−ブチル−４，４−ビス（ｔ−ブチルパーオキシ）ブタン；２，２−ビス（ｔ−ブチルパーオキシ）ブタン；１，１−ビス（ｔ−ブチルパーオキシ）シクロヘキサン；１，１−ビス（ｔ−ブチルパーオキシ）３，３，５−トリメチルシクロヘキサン；ｔ−ブチルパーオキシベンゾエート；ベンゾイルパーオキサイド等を用いることができる。これらの有機過酸化物の配合量は、一般にＥＶＡ樹脂１００重量部に対して５重量部以下、好ましくは１〜３重量部である。
【００２８】
また、太陽電池の封止膜として、発電素子との接着力向上の目的で、ＥＶＡ樹脂にシランカップリング剤を添加することができる。この目的に供されるシランカップリング剤としては公知のもの、例えばγ−クロロプロピルトリメトキシシラン；ビニルトリクロロシラン；ビニルトリエトキシシラン；ビニル−トリス−（β−メトキシエトキシ）シラン；γ−メタクリロキシプロピルトリメトキシシラン；β−（３，４−エトキシシクロヘキシル）エチルトリメトキシシラン；γ−グリシドキシプロピルトリメトキシシラン；ビニルトリアセトキシシラン；γ−メルカプトプロピルトリメトキシシラン；γ−アミノプロピルトリメトキシシラン；Ｎ−β−（アミノエチル）−γ−アミノプロピルトリメトキシシラン等を挙げることができる。これらのシランカップリング剤の配合量は、一般にＥＶＡ樹脂１００重量部に対して５重量部以下、好ましくは０．１〜２重量部である。
【００２９】
更に、ＥＶＡ樹脂のゲル分率を向上させ、耐久性を向上するためにＥＶＡ樹脂に架橋助剤を添加することができる。この目的に供される架橋助剤としては、公知のものとしてトリアリルイソシアヌレート；トリアリルイソシアネート等の３官能の架橋助剤の他、ＮＫエステル等の単官能の架橋助剤等も挙げることができる。これらの架橋助剤の配合量は、一般にＥＶＡ樹脂１００重量部に対して１０重量部以下、好ましくは１〜５重量部である。
【００３０】
更に、ＥＶＡ樹脂の安定性を向上する目的でハイドロキノン；ハイドロキノンモノメチルエーテル；ｐ−ベンゾキノン；メチルハイドロキノンなどを添加することができ、これらの配合量は、一般にＥＶＡ樹脂１００重量部に対して５重量部以下である。
【００３１】
着色ＥＶＡフィルムを構成するＥＶＡ樹脂組成物の着色剤としては、チタン白、炭酸カルシウム等の白色着色剤、ウルトラマリン等の青色着色剤、カーボンブラック等の黒色着色剤、ガラスビーズ及び光拡散剤等の乳白色着色剤等を挙げることができ、好ましくはチタン白である。これらの着色剤の配合量は、ＥＶＡ樹脂１００重量部に対して１０重量部以下、特に１〜５重量部とするのが好ましい。
【００３２】
ＥＶＡフィルムには、更に、必要に応じ、上記以外に紫外線吸収剤、老化防止剤、変色防止剤等を添加することができる。紫外線吸収剤には、２−ヒドロキシ−４−オクトキシベンゾフェノン；２−ヒドロキシ−４−メトキシ−５−スルフォベンゾフェノン等のベンゾフェノン系；２−（２’−ヒドロキシ−５−メチルフェニル）ベンゾトリアゾール等のベンゾトリアゾール系；フェニルサルシレート；ｐ−ｔ−ブチルフェニルサルシレート等のヒンダートアミン系がある。老化防止剤としては、アミン系；フェノール系；ビスフェニル系；ヒンダートアミン系があり、例えばジ−ｔ−ブチル−ｐ−クレゾール；ビス（２，２，６，６−テトラメチル−４−ピペラジル）セバケート等がある。
【００３３】
本発明で用いる着色ＥＶＡフィルム及び透明ＥＶＡフィルムは、このようなＥＶＡ樹脂組成物を常法に従って成膜し、得られたフィルムに必要に応じてエンボス加工を施すことにより製造することができる。
【００３４】
請求項３，４の太陽電池は、表面側封止膜として透明ＥＶＡフィルムを用い、裏面側封止膜として着色ＥＶＡフィルムを用いたものにおいて、着色ＥＶＡフィルムの太陽電池用セル側の面に深さ率２０〜９５％となるような凹部がエンボス加工により施され、好ましくは更に透明ＥＶＡフィルムの太陽電池用セル側の面にも、深さ率２０〜９５％となるような凹部がエンボス加工により施されたものである。
【００３５】
着色ＥＶＡフィルムのエンボス加工の深さ率が小さいと、エンボス加工による反射効率の向上効果を十分に得ることができず、逆に深さ率が大きいと、封止時に空気を巻き込んで、得られる太陽電池内に空気が残留し易くなることから、上記範囲が好ましい。
【００３６】
透明ＥＶＡフィルムのエンボス加工の深さ率についても上記と同様の理由から上記範囲とするのが好ましい。
【００３７】
着色ＥＶＡフィルム及び透明ＥＶＡフィルムのエンボス加工はフィルムの太陽電池用セル側の面にのみ施されていても良く、両面に施されていても良いが、上述のように深いエンボス加工を施す場合は、フィルムの太陽電池用セル側の面にのみエンボス加工を施すことが好ましい。
【００３８】
なお、着色ＥＶＡフィルム及び透明ＥＶＡフィルムの厚みＴは通常の場合５０〜２０００μｍ、特に１００〜１０００μｍとすることが好ましい。
【００３９】
本発明の太陽電池を製造するには、図１に示す如く、ガラス基板１、透明ＥＶＡフィルム３Ａ、太陽電池用セル４、着色ＥＶＡフィルム３Ｂ及びバックカバー２を積層し、積層体を常法に従って、真空ラミネーターで温度１２５〜１５０℃、脱気時間５〜１２分、プレス圧力０．０５〜０．１ＭＰａ、プレス時間８〜４５分で加熱加圧圧着すれば良く、この加熱加圧時に、ＥＶＡフィルム３Ａ，３Ｂが架橋して耐候性に優れた封止膜を形成することができる。
【００４０】
【実施例】
以下に実施例及び比較例を挙げて本発明をより具体的に説明する。
【００４１】
実施例１〜３、比較例１〜６
下記配合のＥＶＡ樹脂組成物をそれぞれ成膜した後、エンボス加工を施し、片面に深さＤ＝３０μｍの凹部を形成した厚さＴ＝６００μｍの着色ＥＶＡフィルム及び透明ＥＶＡフィルムを製造した。
［着色ＥＶＡフィルム用ＥＶＡ樹脂組成物配合（重量部）］
ＥＶＡ樹脂（酢酸ビニル含有量は表１に示す通り） ：１００
架橋剤（１，１−ビス（ｔ−ブチルパーオキシ）３，３，５−トリメチルシクロヘキサン） ：２．０
シランカップリング剤（γ−メタクリロキシプロピルトリメトキシシラン）
：０．５
架橋助剤（トリアリルイソシアヌレート） ：２．０
黄色防止剤 ：０．１
着色剤（チタン白） ：３
［透明ＥＶＡフィルム用ＥＶＡ樹脂組成物配合（重量部）］
ＥＶＡ樹脂（酢酸ビニル含有量は表１に示す通り） ：１００
架橋剤（１，１−ビス（ｔ−ブチルパーオキシ）３，３，５−トリメチルシクロヘキサン） ：２．０
シランカップリング剤（γ−メタクリロキシプロピルトリメトキシシラン）
：０．５
黄色防止剤 ：０．１
架橋助剤（トリアリルイソシアヌレート） ：２．０
紫外線吸収剤（２−ヒドロキシ−４−オクチルベンゾフェノン）：０．０３
【００４２】
得られた着色ＥＶＡフィルム及び透明ＥＶＡフィルムをそれぞれ裏面側封止膜及び表面側封止膜として用い、図１に示す如く、厚さ３ｍｍのガラス板１、厚さ３８μｍのフッ化ポリエチレンフィルムよりなるバックカバー２との間に太陽電池用セル（シリコン発電素子）４を封止して太陽電池を製造した。なお、透明ＥＶＡフィルム３Ａ，着色ＥＶＡフィルム３Ｂはそのエンボス加工面が太陽電池用セル４側となるように配置した。また、封止は、真空ラミネーターを用い、熱板温度１５０℃、脱気時間５分、プレス圧力０．１ＭＰａ、プレス時間４５分間で加熱圧着し、ＥＶＡ樹脂を架橋することにより行った。
【００４３】
このようにして、１００個の太陽電池を作製し、着色ＥＶＡの太陽電池用セルの受光面側への回り込みによる不良品発生率（不良品個数÷１００個×１００）を目視により調べ、不良品発生率が１％以下のものを○、不良品発生率が１％を超え１０％以下のものを△、不良品発生率が１０％を超えるものを×として評価を行い、結果を表１に示した。
【００４４】
【表１】
表１より、酢酸ビニル含有量が比較的少なく流動し難い着色ＥＶＡフィルムと、酢酸ビニル含有量が比較的多く、流動し易い透明ＥＶＡフィルムとを組み合わせることにより、着色ＥＶＡの回り込みを防止することができることがわかる。
【００４６】
実施例４〜６、比較例７
実施例１において、着色ＥＶＡフィルム及び透明ＥＶＡフィルムのエンボス加工により、表２に示す深さ率の凹部を形成したものを用いたこと以外は同様にして太陽電池を作製し、その発電効率を測定し、比較例７の太陽電池を０として、発電効率の向上割合（百分率）を調べ、結果を表２に示した。
【００４７】
【表２】
表２より、深さ率の大きい着色ＥＶＡフィルム及び透明ＥＶＡフィルムを用いることにより太陽電池の発電効率を高めることができることがわかる。
【００４９】
【発明の効果】
以上詳述した通り、本発明の太陽電池によれば、裏面側封止膜として着色ＥＶＡフィルムを用いた太陽電池において、封止工程における太陽電池用セルの受光面側への着色ＥＶＡの回り込みを防止して、外観が良好で高性能な太陽電池を提供することができる。
【００５０】
また、請求項３，４の太陽電池によれば、裏面側封止膜として着色ＥＶＡフィルムを用いた太陽電池において、着色ＥＶＡフィルムによる反射効率の向上効果を高め、より一層発電効率が向上された太陽電池を提供することができる。
【図面の簡単な説明】
【図１】 太陽電池の構成を示す断面図である。
【図２】 封止工程における着色ＥＶＡの太陽電池用セルの受光面側への回り込みを示す平面図である。
【図３】 エンボス加工が施されたフィルムを示す断面図である。
【符号の説明】
１ ガラス基板
２ バックカバー
３Ａ ＥＶＡフィルム（透明ＥＶＡフィルム）
３Ｂ ＥＶＡフィルム（着色ＥＶＡフィルム）
４ 太陽電池用セル
１０ フィルム
１１ 凸部
１２ 凹部[0001]
BACKGROUND OF THE INVENTION
The present invention is a solar cell in which a solar cell is sealed between an upper surface side transparent protective member and a rear surface side protective member via an adhesive film, and the back surface side protective member and the solar cell cell A solar battery using a colored ethylene vinyl acetate copolymer resin (EVA) film as an adhesive film interposed between the transparent protective member and a solar battery cell as an adhesive film interposed between the surface side transparent protective member and the solar cell. About.
[0002]
[Prior art]
In recent years, solar cells that directly convert sunlight into electric energy have attracted attention and are being developed from the viewpoint of effective use of resources and prevention of environmental pollution.
[0003]
As shown in FIG. 1, a solar cell generally has films 3A and 3B formed by forming an EVA resin composition between a glass substrate 1 as a front surface side transparent protective member and a back surface side protective member (back cover) 2. The
[0004]
Such a solar cell is formed by laminating the glass substrate 1, the EVA film 3A for the front side sealing film, the
[0005]
In such a solar cell, it is strongly desired to collect the light incident on the solar cell on the solar cell as efficiently as possible in terms of improving the power generation efficiency. It has been proposed to use a colored EVA film formed by forming an EVA resin composition containing a colorant as the EVA film for stop film 3B (for example, Japanese Patent Laid-Open No. Hei 6-177712).
[0006]
That is, in a general solar cell, the function of condensing incident light is not given to itself, and among the light incident from the light receiving surface of the solar cell, between adjacent solar cell cells. The light passing through the solar cell and the light passing through the solar cell made of a thin film cell pass through the back cover as it is and pass through without contributing to power generation. For this reason, light that contributes to power generation is limited to light that is directly incident on the solar cell and absorbed, among the light incident on the solar cell, but is colored as an EVA film for the back side sealing film When a material containing an agent is used, light reflected between the colored EVA film and the transparent EVA film for the front side sealing film or irregular reflection due to the colorant, the light incident between the cells for solar cells, Since the light that has passed through the cell can be diffusely reflected and incident again on the cell, the utilization efficiency of the light incident on the solar cell is increased, and the power generation efficiency is improved.
[0007]
In the solar cell described in JP-A-6-177212, the colored EVA film for the back side sealing film and the transparent EVA film for the front side sealing film are made of EVA having the same vinyl acetate content. Are used in combination.
[0008]
[Problems to be solved by the invention]
In the solar cell using the colored EVA film as the back side sealing film, the colored EVA 5 constituting the colored EVA film melts and flows during heating and pressurization in the sealing process, as shown in FIG. A phenomenon of entering the light receiving surface side of the
[0009]
In addition, by using the colored EVA film as the back side sealing film, it is possible to improve the power generation efficiency by the light reflection effect of the colored EVA film, but further improvement of the reflection efficiency and the improvement of the power generation efficiency are desired. It is rare.
[0010]
Therefore, the present invention, in a solar cell using a colored EVA film as the back side sealing film, prevents the colored EVA from wrapping around the light receiving surface side of the solar cell in the sealing step, and has a good appearance. An object is to provide a high-performance solar cell.
[0011]
Another object of the present invention is to provide a solar cell using a colored EVA film as a back side sealing film, enhancing the reflection efficiency improvement effect by the colored EVA film, and further improving the power generation efficiency. To do.
[0012]
[Means for Solving the Problems]
The solar cell of the present invention is a solar cell formed by sealing a solar cell with an adhesive film between a front surface side transparent protective member and a back surface side protective member, and the back surface side protective member and the solar cell The adhesive film interposed between the battery cells is a colored EVA film formed by forming an ethylene vinyl acetate copolymer resin composition containing a colorant, and the surface-side transparent protective member, the solar battery cell, In a solar cell in which the adhesive film interposed between the two is a transparent EVA film formed by forming an ethylene vinyl acetate copolymer resin composition, the vinyl acetate content of the ethylene vinyl acetate copolymer resin constituting the colored EVA film than the amount, vinyl acetate content of ethylene-vinyl acetate copolymer resin constituting the transparent EVA film lot, ethylene vinyl acetate copolymer constituting the colored EVA film Vinyl acetate content B wt% of coalescing the resin is 10 to 40% by weight, constituting the vinyl acetate content of A% by weight of ethylene vinyl acetate copolymer resin constituting the transparent EVA film, the colored EVA film The difference (A−B) from the vinyl acetate content B wt% of the ethylene vinyl acetate copolymer resin is 2 to 8 wt%.
[0013]
By increasing the vinyl acetate content of EVA constituting the transparent EVA film as the front side sealing film, rather than the vinyl acetate content of EVA constituting the colored EVA film as the back side sealing film, the sealing step It is possible to prevent the colored EVA from wrapping around the light receiving surface side of the solar battery cell. That is, the vinyl acetate content of EVA correlates with the fluidity of EVA when heated and melted. When the vinyl acetate content is large, the fluidity is good and easy to flow, and when the vinyl acetate content is small, the fluidity is poor. It becomes difficult to flow.
[0014]
In the present invention, by making the vinyl acetate content of EVA constituting the colored EVA film smaller than the vinyl acetate content of EVA constituting the transparent EVA film, the colored EVA is less likely to flow than the transparent EVA, and the colored EVA Prevent wraparound.
[0015]
In particular, the vinyl acetate content A wt% of EVA constituting the transparent EVA film is 10 to 40 wt%, and the vinyl acetate content B wt% of EVA constituting the colored EVA film is 10 to 40 wt%. preferable.
[0016]
Further, the colored EVA film is preferably embossed on the surface of the solar cell, and the depth of the recess formed by the embossing is preferably 20 to 95% of the thickness of the film. In this way, if the colored EVA film has a deep embossed surface on the surface on the solar cell side, the interface between the colored EVA film and the transparent EVA film becomes rough, and the light reflection efficiency is increased. Power generation efficiency is improved.
[0017]
Moreover, the design property of a solar cell can also be improved by the irregular reflection of light by such an uneven | corrugated interface.
[0018]
In this case, it is preferable that a concave portion having a depth of 20 to 95% of the thickness of the film is formed by embossing on the surface of the transparent EVA film as the surface side sealing film on the solar cell side.
[0019]
In the present invention, the value R A of the MFR (melt flow rate) of the ethylene vinyl acetate copolymer resin constituting the transparent EVA film and the value R B of the MFR of the ethylene vinyl acetate copolymer resin constituting the colored EVA film are used. The difference (R A -R B ) is preferably 1 to 50, and the melting point M A ° C of the ethylene vinyl acetate copolymer resin constituting the transparent EVA film and the ethylene vinyl acetate copolymer constituting the colored EVA film the difference between the melting point M B ° C. coalescing resin (M a -M B) ℃ it is preferably 0.1 to 30.
[0020]
In addition, the depth of the embossed recess in the present invention (hereinafter simply referred to as “depth”) is the
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
[0022]
The solar cell of the present invention uses a transparent EVA film as the front-side sealing film and a colored EVA film as the back-side sealing film. The EVA vinyl vinyl content of the EVA constituting the transparent EVA film is colored. 1 is the same as that of the conventional solar cell shown in FIG. 1 except that the content is larger than the vinyl acetate content of EVA.
[0023]
The vinyl acetate content A wt% of EVA constituting the transparent EVA film is 2 to 8 wt% higher than the vinyl acetate content B wt% of EVA constituting the colored EVA film, that is, AB = 2 to 8 % By weight. If this vinyl acetate content difference is more than 8 % by weight, it will be difficult to satisfy the vinyl acetate content suitable for the EVA film for adhesion, and if this vinyl acetate content difference is less than 2 % by weight, coloring will occur. In some cases, the colored EVA of the EVA film cannot be reliably prevented from wrapping around the light receiving surface of the solar cell.
[0024]
The vinyl acetate content A wt% of EVA constituting the transparent EVA film is particularly preferably 10 to 40 wt%, and the vinyl acetate content B wt% of EVA constituting the colored EVA film is 10 to 40 wt%. der Ru. When the vinyl acetate content is higher than this range, EVA tends to flow when heated and melted, and it tends to protrude from between the glass substrate and the back cover. When the vinyl acetate content is lower than this range, workability is improved. Further, the EVA film is too hard and the deaeration at the time of sealing is deteriorated.
[0025]
In the present invention, a difference R A -R B of the MFR values R B of the ethylene-vinyl acetate copolymer resin constituting the colored and MFR values R A of the ethylene-vinyl acetate copolymer resin EVA film constituting the transparent EVA film 1 to 50, and the difference between the melting point M A ° C of the ethylene vinyl acetate copolymer resin constituting the transparent EVA film and the melting point M B ° C of the ethylene vinyl acetate copolymer resin constituting the colored EVA film ( M A -M B ) ° C. is preferably 0.1-30.
[0026]
Below, the EVA resin composition which comprises the coloring EVA film and transparent EVA film which are used by this invention is demonstrated.
[0027]
In order to improve weather resistance, the EVA resin composition used in the present invention has a crosslinking structure by adding a crosslinking agent. Generally, the crosslinking agent is an organic peroxide that generates radicals at 100 ° C. or higher. In particular, if the stability at the time of blending is taken into consideration, it is preferable that the decomposition temperature with a half-life of 10 hours is 70 ° C. or higher. Examples of such an organic peroxide include 2,5-dimethylhexane; 2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; -T-butyl peroxide; t-dicumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne; dicumyl peroxide; α, α'-bis (t-butylperoxide Oxyisopropyl) 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-butylperoxybenzoate; benzoyl peroxide, etc. Kill. The compounding amount of these organic peroxides is generally 5 parts by weight or less, preferably 1 to 3 parts by weight with respect to 100 parts by weight of the EVA resin.
[0028]
Moreover, a silane coupling agent can be added to EVA resin as a sealing film of a solar cell for the purpose of improving the adhesive force with a power generating element. Known silane coupling agents for this purpose are, for example, γ-chloropropyltrimethoxysilane; vinyltrichlorosilane; vinyltriethoxysilane; vinyl-tris- (β-methoxyethoxy) silane; γ-methacryloxy. Propyltrimethoxysilane; β- (3,4-ethoxycyclohexyl) ethyltrimethoxysilane; γ-glycidoxypropyltrimethoxysilane; vinyltriacetoxysilane; γ-mercaptopropyltrimethoxysilane; γ-aminopropyltrimethoxysilane N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane and the like can be mentioned. The amount of these silane coupling agents is generally 5 parts by weight or less, preferably 0.1 to 2 parts by weight, based on 100 parts by weight of the EVA resin.
[0029]
Furthermore, a crosslinking aid can be added to the EVA resin in order to improve the gel fraction of the EVA resin and improve the durability. Examples of crosslinking aids provided for this purpose include trifunctional crosslinking aids such as triallyl isocyanurate; triallyl isocyanate as well as monofunctional crosslinking aids such as NK esters. it can. The amount of these crosslinking aids is generally 10 parts by weight or less, preferably 1 to 5 parts by weight with respect to 100 parts by weight of the EVA resin.
[0030]
Furthermore, hydroquinone; hydroquinone monomethyl ether; p-benzoquinone; methyl hydroquinone, etc. can be added for the purpose of improving the stability of the EVA resin. The amount of these compounds is generally 5 parts by weight with respect to 100 parts by weight of the EVA resin. It is as follows.
[0031]
Examples of the colorant of the EVA resin composition constituting the colored EVA film include white colorants such as titanium white and calcium carbonate, blue colorants such as ultramarine, black colorants such as carbon black, glass beads, and light diffusing agents. Milky white colorant, and the like, preferably titanium white. The blending amount of these colorants is preferably 10 parts by weight or less, particularly 1 to 5 parts by weight with respect to 100 parts by weight of the EVA resin.
[0032]
In addition to the above, an ultraviolet absorber, an antiaging agent, a discoloration preventing agent and the like can be added to the EVA film as necessary. Examples of ultraviolet absorbers include 2-hydroxy-4-octoxybenzophenone; benzophenones such as 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2- (2′-hydroxy-5-methylphenyl) benzotriazole Benzotriazoles; phenyl salsylates; hindered amines such as pt-butylphenyl salsylates. Antiaging agents include amines; phenols; bisphenyls; hindered amines, such as di-t-butyl-p-cresol; bis (2,2,6,6-tetramethyl-4-piperazyl). ) Sebacate.
[0033]
The colored EVA film and the transparent EVA film used in the present invention can be produced by forming such an EVA resin composition according to a conventional method and embossing the obtained film as necessary.
[0034]
The solar cell according to
[0035]
If the depth ratio of embossing of the colored EVA film is small, the effect of improving the reflection efficiency by embossing cannot be obtained sufficiently. Conversely, if the depth ratio is large, it is obtained by entraining air during sealing. The above range is preferable because air easily remains in the solar cell.
[0036]
The depth ratio of embossing of the transparent EVA film is preferably within the above range for the same reason as described above.
[0037]
Embossing of colored EVA film and transparent EVA film may be applied only to the solar cell side surface of the film, or may be applied to both surfaces, but when deep embossing is applied as described above It is preferable to emboss only the surface of the film on the cell side for solar cells.
[0038]
In addition, the thickness T of the colored EVA film and the transparent EVA film is usually 50 to 2000 μm, particularly preferably 100 to 1000 μm.
[0039]
In order to manufacture the solar battery of the present invention, as shown in FIG. 1, a glass substrate 1, a transparent EVA film 3A, a
[0040]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
[0041]
Examples 1-3, Comparative Examples 1-6
Each EVA resin composition having the following composition was formed into a film, and then embossed to produce a colored EVA film having a thickness T = 600 μm and a transparent EVA film having a recess having a depth D = 30 μm on one side.
[EVA resin composition for colored EVA film (parts by weight)]
EVA resin (vinyl acetate content is as shown in Table 1): 100
Cross-linking agent (1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane): 2.0
Silane coupling agent (γ-methacryloxypropyltrimethoxysilane)
: 0.5
Crosslinking aid (triallyl isocyanurate): 2.0
Yellow inhibitor: 0.1
Colorant (titanium white): 3
[Contains EVA resin composition for transparent EVA film (parts by weight)]
EVA resin (vinyl acetate content is as shown in Table 1): 100
Cross-linking agent (1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane): 2.0
Silane coupling agent (γ-methacryloxypropyltrimethoxysilane)
: 0.5
Yellow inhibitor: 0.1
Crosslinking aid (triallyl isocyanurate): 2.0
UV absorber (2-hydroxy-4-octylbenzophenone): 0.03
[0042]
The obtained colored EVA film and transparent EVA film are used as a back side sealing film and a front side sealing film, respectively, and as shown in FIG. 1, a glass plate 1 having a thickness of 3 mm and a fluorinated polyethylene film having a thickness of 38 μm are used. A solar battery cell (silicon power generation element) 4 was sealed between the back cover 2 and a solar battery. The transparent EVA film 3A and the colored EVA film 3B were arranged so that their embossed surfaces were on the
[0043]
In this way, 100 solar cells were produced, and the defective product generation rate (number of defective products ÷ 100 × 100) due to the wraparound of the colored EVA to the light receiving surface side of the solar cell was visually examined. Evaluations were made with ○ as the rate of occurrence is 1% or less, △ when the rate of defective products exceeds 1% and 10% or less, and X when the rate of defective products exceeds 10%, and the results are shown in Table 1. Indicated.
[0044]
[Table 1]
From Table 1, it is possible to prevent the wraparound of the colored EVA by combining a colored EVA film having a relatively small vinyl acetate content and hardly flowing, and a transparent EVA film having a relatively large vinyl acetate content and easy to flow. I understand that I can do it.
[0046]
Examples 4-6, Comparative Example 7
In Example 1, a solar cell was prepared in the same manner except that a concave portion having a depth rate shown in Table 2 was formed by embossing a colored EVA film and a transparent EVA film, and the power generation efficiency was measured. Then, the rate of improvement in power generation efficiency (percentage) was examined with the solar cell of Comparative Example 7 set to 0.
[0047]
[Table 2]
From Table 2, it can be seen that the power generation efficiency of the solar cell can be increased by using a colored EVA film and a transparent EVA film having a large depth ratio.
[0049]
【The invention's effect】
As described in detail above, according to the solar cell of the present invention, in the solar cell using the colored EVA film as the back side sealing film, the colored EVA wraps around the light receiving surface side of the solar cell in the sealing step. Therefore, it is possible to provide a high-performance solar cell with a good appearance.
[0050]
Moreover, according to the solar cell of
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a solar cell.
FIG. 2 is a plan view showing wraparound of colored EVA to the light receiving surface side of a solar cell in a sealing step.
FIG. 3 is a cross-sectional view showing an embossed film.
[Explanation of symbols]
1 glass substrate 2 back cover 3A EVA film (transparent EVA film)
3B EVA film (colored EVA film)
4 Cell for Solar Cell 10 Film 11 Protrusion 12 Concavity
Claims (4)
該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量よりも、該透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量が多く、該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ｂ重量％が１０〜４０重量％であり、該透明ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ａ重量％と、該着色ＥＶＡフィルムを構成するエチレン酢酸ビニル共重合体樹脂の酢酸ビニル含有量Ｂ重量％との差（Ａ−Ｂ）が２〜８重量％であることを特徴とする太陽電池。A solar cell in which a solar cell is sealed between the front surface side transparent protective member and the back surface side protective member via an adhesive film, between the back surface side protective member and the solar cell. The adhesive film to be interposed is a colored EVA film formed by forming an ethylene vinyl acetate copolymer resin composition containing a colorant, and the adhesive film is interposed between the surface-side transparent protective member and the solar cell. Is a transparent EVA film formed by forming a film of an ethylene vinyl acetate copolymer resin composition,
The vinyl acetate content of the ethylene vinyl acetate copolymer resin constituting the transparent EVA film is larger than the vinyl acetate content of the ethylene vinyl acetate copolymer resin constituting the colored EVA film, and the colored EVA film is constituted. The vinyl acetate content B wt% of the ethylene vinyl acetate copolymer resin is 10 to 40 wt%, and the vinyl acetate content A wt% of the ethylene vinyl acetate copolymer resin constituting the transparent EVA film; A solar cell, wherein a difference (A−B) from the vinyl acetate content B wt% of the ethylene vinyl acetate copolymer resin constituting the colored EVA film is 2 to 8 wt%.
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| JP2002051719A JP4467222B2 (en) | 2002-02-27 | 2002-02-27 | Solar cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002051719A JP4467222B2 (en) | 2002-02-27 | 2002-02-27 | Solar cell |
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| JP4467222B2 true JP4467222B2 (en) | 2010-05-26 |
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