JP5121203B2 - 太陽電池モジュール - Google Patents
太陽電池モジュール Download PDFInfo
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- JP5121203B2 JP5121203B2 JP2006269254A JP2006269254A JP5121203B2 JP 5121203 B2 JP5121203 B2 JP 5121203B2 JP 2006269254 A JP2006269254 A JP 2006269254A JP 2006269254 A JP2006269254 A JP 2006269254A JP 5121203 B2 JP5121203 B2 JP 5121203B2
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- 229910004541 SiN Inorganic materials 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
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Description
本発明の実施の形態に係る光起電力素子について、図1及び図2を参照して説明する。
次に、上述した光起電力素子を用いた太陽電池モジュールについて図4に示す断面図を参照して説明する。
本実施形態に係る太陽電池モジュールは、図2に示すように、受光面側保護層10の、光の入射方向に平行な断面において、凹凸面の凹部の厚さW1よりも、凹凸面の凸部の厚さW2の方が薄い。従来の太陽電池モジュールのように、凹部と凸部の厚さが同じであると、図5に示すように、樹脂の膨張等による保護層内の応力は、光電変換部との界面に沿って上向きで発生し、凸部において光電変換部から保護層が剥離する場合がある。本実施形態においては、凸部の膜厚が薄いので、凸部の応力を低減することができるため、光起電力素子の反り及び剥離が低減され、その結果、耐候性を向上させることができる。
本発明は上記の実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
本発明の実施例に係る太陽電池モジュールの作製方法について、以下に説明する。
本発明では、保護層の応力に着目し、議論を行っている。一般的に応力緩和のために、微粒子添加や応力の低い材料との混合などが知られている。そこで、実際に応力緩和の効果があるかについて調べるために種々の保護層の応力を評価した。
光電変換層上に、粒径20nm程度のZnO微粒子を含む保護層(ZnO含有量75%)を2種類のスプレーを用いて形成した。尚、ここで、保護層は光入射側のみに形成している。用いた保護層材料は、1cp程度と低粘度な材料とした。スプレーAは、保護材料をシャワー上に高圧で塗布するために、凹部で厚く、凸部で薄い保護層が形成できる。スプレーBは、保護材料をらせん状に塗布するため、凹凸部に関係なく、ほぼ均一な膜厚の保護層を形成できる。尚、塗布する保護材料の量は、両スプレーでほぼ同程度になるように調整した。保護層の厚みは、塗布重量より換算して、0.5μm以下である。
実験1で得られた結果から、凸部の膜厚は薄膜構造がよいことが分かった。一方、素子全体の耐候性を維持するために、凹部は厚膜構造とすることが望ましいことも分かった。そこで、凹部の応力が耐候性に与える影響を確認した。スプレーAを用いて、応力が比較的大きなアクリル単層の塗布を行った。その結果、アクリル層を塗布後、乾燥することで光起電力素子の反りが観察されることが分かった。これは、スプレーAでは、凹部が比較的厚膜構造となっており、反りの影響は凹部における応力の影響が大きく表れたものと考えられる。特に、凹部で保護層が膨張した場合には、その力は凹部の側面に大きくかかることになる。この力によって素子の反りが生じるものと考えられる。
実験2は応力緩和層を設ける構造としたが、実験3では、凹部の応力を緩和するために凹部全体に応力緩和材を入れた構造について評価を行った。ここでは、応力緩和材として、ZnO微粒子を塗布した構造を用いた。スプレーAを用いて、霧化圧力を高めに設定し、ZnO微粒子添加の有無の2種類の保護層を形成した。又、ZnO微粒子を添加した保護層は、凹部における数密度よりも凸部における数密度の方が小さかった。又、塗布膜厚は、塗布量換算で約3μmであった。表6に実験3で作製した保護層構造と、耐候性評価の結果を示す。
実験4では、応力緩和を目的に保護層内に空孔を導入する手法を検討した。ここで、ZnO微粒子を含むアクリル層を、スプレー法とロールコート法による塗布を行った。ロールコート法では、保護材を上部から押し付ける形で成膜を行う。そのため、凹部では押し付け圧力が比較的弱く、複数回成膜をする手法をとることで、凹部に空孔を形成することが可能になる。これらのサンプルの耐候性評価結果を表7に示す。ここで、スプレー法の耐候性を1として規格化している。尚、ここで述べる空孔は少なくとも長径が1μm以上と比較的大きなものである。
1A…受光面
1B…背面
2…i型非晶質シリコン層
3…p型非晶質シリコン層
4…受光面側透明電極層
4A…受光面
5…受光面側電極
6…i型非晶質シリコン層
7…n型非晶質シリコン層
8…背面側透明電極層
9…背面側電極
10…受光面側保護層
21…受光面側透光性部材
22…樹脂層
23…背面側部材
100…光起電力素子
101…光電変換部
200…太陽電池モジュール
Claims (5)
- 複数の光起電力素子と、
前記複数の光起電力素子を封止する封止樹脂と、を備え、
前記光起電力素子は、
光入射面にテクスチャ面を反映した凹凸面を有する光電変換部と、
前記凹凸面を覆い、前記凹凸面を反映する程度に薄く設けられた、樹脂からなる保護層とを備え、
前記保護層の、光の入射方向に平行な断面において、前記凹凸面の凹部の厚さよりも、前記凹凸面の凸部の厚さの方が薄いことを特徴とする太陽電池モジュール。 - 前記保護層は、少なくとも前記凹部において微粒子を含み、
当該凹部に配置された前記微粒子は、前記保護層の光入射側よりも光電変換部側に多く配置されていることを特徴とする請求項1に記載の太陽電池モジュール。 - 前記保護層の凹部に含まれる硬化剤の量は、前記保護層の光入射側よりも光電変換部側の方が少ないことを特徴とする請求項1又は2に記載の太陽電池モジュール。
- 前記保護層は微粒子を含み、
前記保護層の、光の入射方向に平行な断面において、前記凹凸面の凹部を中心とした単位長さ当たりの第1領域に含まれる微粒子の数を当該第1領域の面積で除算した値よりも、前記凹凸面の凸部を中心とした単位長さ当たりの第2領域に含まれる微粒子の数を当該第2領域の面積で除算した値の方が小さいことを特徴とする請求項1〜3のいずれか1項に記載の太陽電池モジュール。 - 前記保護層の凹部において、当該保護層を形成する樹脂に空孔が含まれることを特徴とする請求項1〜4のいずれか1項に記載の太陽電池モジュール。
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JP2006269254A JP5121203B2 (ja) | 2006-09-29 | 2006-09-29 | 太陽電池モジュール |
US12/442,728 US20100006147A1 (en) | 2006-09-29 | 2007-09-20 | Solar cell module |
KR1020097008670A KR20090061668A (ko) | 2006-09-29 | 2007-09-20 | 태양 전지 모듈 |
PCT/JP2007/068266 WO2008041489A1 (en) | 2006-09-29 | 2007-09-20 | Solar cell module |
EP07807630.4A EP2068373B1 (en) | 2006-09-29 | 2007-09-20 | Solar cell module |
CN2007800359972A CN101517748B (zh) | 2006-09-29 | 2007-09-20 | 太阳能电池模块 |
TW096135664A TW200816505A (en) | 2006-09-29 | 2007-09-26 | Solar battery module |
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EP (1) | EP2068373B1 (ja) |
JP (1) | JP5121203B2 (ja) |
KR (1) | KR20090061668A (ja) |
CN (1) | CN101517748B (ja) |
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- 2007-09-20 KR KR1020097008670A patent/KR20090061668A/ko not_active Application Discontinuation
- 2007-09-20 WO PCT/JP2007/068266 patent/WO2008041489A1/ja active Application Filing
- 2007-09-20 EP EP07807630.4A patent/EP2068373B1/en not_active Not-in-force
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US20100006147A1 (en) | 2010-01-14 |
JP2008091531A (ja) | 2008-04-17 |
EP2068373B1 (en) | 2016-12-07 |
EP2068373A4 (en) | 2014-08-13 |
TW200816505A (en) | 2008-04-01 |
EP2068373A1 (en) | 2009-06-10 |
CN101517748B (zh) | 2011-01-26 |
CN101517748A (zh) | 2009-08-26 |
WO2008041489A1 (en) | 2008-04-10 |
KR20090061668A (ko) | 2009-06-16 |
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