JP6656225B2 - 太陽電池およびその製造方法、ならびに太陽電池モジュール - Google Patents
太陽電池およびその製造方法、ならびに太陽電池モジュール Download PDFInfo
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- JP6656225B2 JP6656225B2 JP2017509487A JP2017509487A JP6656225B2 JP 6656225 B2 JP6656225 B2 JP 6656225B2 JP 2017509487 A JP2017509487 A JP 2017509487A JP 2017509487 A JP2017509487 A JP 2017509487A JP 6656225 B2 JP6656225 B2 JP 6656225B2
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Description
本発明の太陽電池は、ヘテロ接合太陽電池とよばれるものであり、導電型単結晶シリコン基板の表面に、単結晶シリコンとはバンドギャップの異なるシリコン系薄膜を有することにより、拡散電位が形成された結晶シリコン太陽電池である。シリコン系薄膜としては、非晶質のものが好ましい。中でも、拡散電位を形成するための導電型非晶質シリコン系薄膜と単結晶シリコン基板の間に、薄い真性の非晶質シリコン層を介在させたものは、変換効率の最も高い結晶シリコン太陽電池の形態の一つとして知られている。
太陽電池100の製造方法は、光電変換部50を作製する工程と、光電変換部50の第一主面上にパターン状の集電極7を形成する工程と、光電変換部50の第二主面上に裏面電極8を形成する工程と、光電変換部50の第二主面の周縁および光電変換部50の側面上に接続電極9を形成する工程とを有する。集電極7を形成する工程は、光電変換部50の第一主面上に第一金属シード層71を形成する工程と、第一金属シード層71上に、めっき法により第一めっき層72を形成する工程とを有する。裏面電極8を形成する工程は、光電変換部50の第二主面上に第二金属シード層81を形成する工程を有する。裏面電極8を形成する工程は、第二金属シード層81上に、めっき法により第二めっき層82を形成する工程を含んでいてもよい。接続電極9を形成する工程は、光電変換部50の第二主面の周縁および光電変換部50の側面上に第三金属シード層91を形成する工程と、第三金属シード層91上に、めっき法により第三めっき層92を形成する工程とを有する。
図3A〜図3Cに示すように、単結晶シリコン基板1の第一主面上に第一導電型シリコン系薄膜3aを形成し、第二主面上に第二導電型シリコン系薄膜3bを形成する。これらの導電型シリコン系薄膜は、いずれか一方がp型であり、他方がn型である。
図6A〜図6Cに示すように、透明電極層6b上に金属シード層81を形成し、透明電極層6c上に金属シード層91を形成する。金属シード層81および91は、それぞれ透明電極層6bおよび6c上の略全面に形成される。
図8A〜図8Cに示すように、金属シード層71を起点として、めっき法によりめっき層72を形成する。これにより、金属シード層71およびめっき層72を含む集電極7が形成される。透明電極層6a上への金属の析出を抑制するために、透明電極層6a上に絶縁層が形成されることが好ましい。
透明電極上に絶縁層を形成後、絶縁層を貫通する溝を設けて透明電極層の表面または側面を露出させ、透明電極層の露出面に光めっき等により金属シード層を析出させた後、この金属シードを起点としてめっきによりめっき層を形成する(特開2011−199045号参照)。
凹凸を有する金属シード層上に、絶縁層を形成することにより、絶縁層が不連続となるため、開口が形成される。この開口を起点としてめっきによりめっき層を形成する(WO2011/045287号)。
低融点材料を含有する金属シード層上に絶縁層を形成後、または絶縁層形成時に、加熱により低融点材料を熱流動させて、金属シード層上の絶縁層に開口を形成し、この開口を起点としてめっきによりめっき層を形成する(WO2013/077038号)。
絶縁層として自己組織化単分子膜を形成後、金属シード層上の自己組織化単分子膜が剥離除去されることにより、絶縁層に開口が形成される(金属シード層が露出した状態となる)。露出した金属シード層を起点としてめっきによりめっき層を形成する(WO2014/097829号)。この方法では、透明電極層上には自己組織化単分子膜が形成されているため、透明電極層上へのめっき層の析出が抑制される。
本発明の太陽電池は、実用に際して、封止材により封止して、モジュール化されることが好ましい。太陽電池のモジュール化は、適宜の方法により行われる。太陽電池モジュールの構成は特に限定されないが、上記の太陽電池が、配線シートを介して、他の太陽電池または外部回路と接続されることが好ましい。
図12は、太陽電池と配線シートとの電気的接続を説明するための概略図である。図12では、図11に示す構成のうち、太陽電池と配線シートとの電気的接続に必要な構成を抜粋して図示している。
本発明の太陽電池モジュールを構成する配線シートは、例えば以下のように製造できる。まず、絶縁性基材を準備する。絶縁性基材としては、電気絶縁性のものであれば特に限定されず、例えば、ガラス板やエポキシ樹脂板等の硬質材料、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリイミド(PI)等の樹脂フィルム等を用いることができる。絶縁性基材の厚みは特に限定されず、例えば、10μm〜5mm程度の範囲で、材料の特性等に応じて選択すればよい。
以上、本発明の好ましい実施形態に係る太陽電池、および該太陽電池を備える太陽電池モジュールについて説明したが、本発明は上記の実施形態に限定されるものではない。本発明の効果が得られる限り、太陽電池の構成(集電極、裏面電極および裏面電極の形状等)は任意の構成を採用できる。また、太陽電池モジュールの構成(太陽電池の電気的接続、配線シートの構成等)についても、任意の構成を採用できる。
2a,2b 真性シリコン系薄膜
3a,3b 導電型シリコン系薄膜
6a,6b,6c 透明電極層
7,7a,7b,7c 集電極
8,8a,8b,8c 裏面電極
9,9a,9b,9c 接続電極
50 光電変換部
71,81,91 金属シード層
72,82,92 めっき層
100,101,102,103,111,112,113 太陽電池
200 太陽電池モジュール
201 受光面側保護材
202 裏面側保護材
203 封止材
300,350,360 配線シート
311,312,313,314,315,316 表面配線
321,322,323 裏面配線
330 絶縁性基材
401,402,403,404,405 導通部
411,412,413,414,415 貫通孔
Claims (14)
- 導電型単結晶シリコン基板(1)の第一主面上に第一導電型シリコン系薄膜(3a)および第一透明電極層(6a)をこの順に有し、前記導電型単結晶シリコン基板の第二主面上に第二導電型シリコン系薄膜(3b)および第二透明電極層(6b)をこの順に有する光電変換部を備える太陽電池の製造方法であって、
前記光電変換部の第一主面上に、第一金属シード層(71)を形成する工程と、
前記光電変換部の第二主面上に、第二金属シード層(81)を形成する工程と、
前記光電変換部の第二主面の周縁および前記光電変換部の側面上に、第三金属シード層(91)を形成する工程と、を有し、
前記第一金属シード層、前記第二金属シード層および前記第三金属シード層は、前記第一金属シード層と前記第三金属シード層とが導通し、前記第二金属シード層と前記第三金属シード層とが導通しないように形成され、
前記第一金属シード層および前記第三金属シード層の少なくとも一方に給電を行うことにより、前記第一金属シード層上の第一めっき層(72)および前記第三金属シード層上の第三めっき層(92)が同時に形成される、太陽電池の製造方法。 - 前記光電変換部の第二主面上にマスクが設けられた状態で、前記光電変換部の第二主面側から金属層を製膜することにより、前記第二金属シード層および前記第三金属シード層が同時に形成される、請求項1に記載の太陽電池の製造方法。
- 前記第三金属シード層に給電を行うことにより、前記第一めっき層および前記第三めっき層が同時に形成される、請求項1または2に記載の太陽電池の製造方法。
- さらに、前記第二金属シード層上に、めっき法により第二めっき層(82)を形成する工程を有する、請求項1〜3のいずれか1項に記載の太陽電池の製造方法。
- 前記光電変換部は、第三透明電極層(6c)をさらに有し、
前記第三透明電極層は、前記第二導電型シリコン系薄膜の周縁および前記導電型単結晶シリコン基板の側面上に設けられ、前記第二透明電極層と導通しておらず、
前記第三金属シード層は、前記第三透明電極層上に形成され、
前記第一透明電極層および前記第一金属シード層の少なくともいずれか一方と前記第三透明電極層とが、互いに接するように形成される、請求項1〜4のいずれか1項に記載の太陽電池の製造方法。 - 導電型単結晶シリコン基板(1)の第一主面上に第一導電型シリコン系薄膜(3a)および第一透明電極層(6a)をこの順に有し、前記導電型単結晶シリコン基板の第二主面上に第二導電型シリコン系薄膜(3b)および第二透明電極層(6b)をこの順に有する光電変換部を備える太陽電池であって、
第一導電型用のパターン状の集電極(7)と、
第二導電型用の裏面電極(8)と、
前記集電極と導通し、かつ前記裏面電極と導通していない接続電極(9)とを備え、
前記集電極は、前記光電変換部の第一主面上に設けられた第一金属シード層(71)と、前記第一金属シード層上に設けられた第一めっき層(72)とを含み、
前記裏面電極は、前記光電変換部の第二主面上に設けられた第二金属シード層(81)を含み、
前記接続電極は、前記光電変換部の第二主面の周縁および前記光電変換部の側面上に設けられた第三金属シード層(91)と、前記第三金属シード層上に設けられた第三めっき層(92)とを含み、
前記第三金属シード層は、前記第一金属シード層と導通し、かつ前記第二金属シード層と導通しておらず、
前記第二金属シード層と前記第三金属シード層とが同一の材料を主成分とし、
前記第一めっき層と前記第三めっき層とが同一の材料を主成分とする、太陽電池。 - 前記裏面電極は、前記第二金属シード層上に設けられた第二めっき層(82)をさらに含む、請求項6に記載の太陽電池。
- 前記光電変換部は、第三透明電極層(6c)をさらに有し、
前記第三透明電極層は、前記第二導電型シリコン系薄膜の周縁および前記導電型単結晶シリコン基板の側面上に設けられ、前記第二透明電極層と導通しておらず、
前記第三金属シード層は、前記第三透明電極層上に設けられている、請求項6または7に記載の太陽電池。 - 請求項6〜8のいずれか1項に記載の太陽電池と、配線シート(300)とを備え、
前記太陽電池が、前記配線シートを介して、他の太陽電池または外部回路と接続されている、太陽電池モジュール。 - 請求項6〜8のいずれか1項に記載の太陽電池の複数が配線シート(300)を介して電気的に直列に接続されている太陽電池モジュールであって、前記複数の太陽電池は第一太陽電池(101)および第二太陽電池(102)を含み、
前記第一太陽電池および前記第二太陽電池は、いずれも、裏面電極(8a、8b)が前記配線シートの第一主面に対向するように配置され、
前記配線シートは、第一貫通孔(411)および第二貫通孔(412)が設けられた絶縁性基材(330)と、前記絶縁性基材の第二主面上に設けられた第一裏面配線(321)と、前記第一貫通孔内に設けられた第一導通部(401)と、前記第二貫通孔内に設けられた第二導通部(402)とを備え、
前記第一裏面配線は、前記第一導通部と前記第二導通部とを電気的に接続しており、
前記第一導通部が前記第一太陽電池の接続電極(9a)と電気的に接続され、前記第二導通部が前記第二太陽電池の裏面電極(8b)と電気的に接続されることにより、前記第一太陽電池の集電極(7a)と前記第二太陽電池の裏面電極(8b)とが、前記第一太陽電池の接続電極(9a)、前記第一導通部、前記第一裏面配線および前記第二導通部を介して電気的に接続されている、太陽電池モジュール。 - 前記配線シートは、前記絶縁性基材の第一主面上に、第一表面配線(311)および第二表面配線(312)を備え、
前記第一表面配線は、前記第一導通部を介して前記第一裏面配線と電気的に接続され、
前記第二表面配線は、前記第二導通部を介して前記第一裏面配線と電気的に接続され、
前記第一太陽電池の接続電極が前記第一表面配線と接続され、前記第二太陽電池の裏面電極が前記第二表面配線と接続されることにより、前記第一太陽電池の集電極と前記第二太陽電池の裏面電極とが電気的に接続されている、請求項10に記載の太陽電池モジュール。 - 前記複数の太陽電池は、前記第一太陽電池(101)と電気的に直列に接続された第三太陽電池(103)をさらに含み、
前記第三太陽電池は、裏面電極(8c)が前記配線シートの第一主面に対向するように配置され、
前記絶縁性基材には、第三貫通孔(413)および第四貫通孔(414)がさらに設けられており、
前記配線シートは、前記絶縁性基材の第二主面上に設けられた第二裏面配線(322)と、前記第三貫通孔内に設けられた第三導通部(403)と、前記第四貫通孔内に設けられた第四導通部(404)とをさらに備え、
前記第二裏面配線は、前記第三導通部と前記第四導通部とを電気的に接続しており、
前記第三導通部が前記第一太陽電池の裏面電極(8a)と電気的に接続され、前記第四導通部が前記第三太陽電池の接続電極(9c)と電気的に接続されることにより、前記第一太陽電池の裏面電極(8a)と前記第三太陽電池の集電極(7c)とが、前記第三導通部、前記第二裏面配線、前記第四導通部および前記第三太陽電池の接続電極を介して電気的に接続されている、請求項10または11に記載の太陽電池モジュール。 - 前記配線シートは、前記絶縁性基材の第一主面上に、第一表面配線(311)、第二表面配線(312)、第三表面配線(313)および第四表面配線(314)を備え、
前記第一表面配線は、前記第一導通部を介して前記第一裏面配線と電気的に接続され、
前記第二表面配線は、前記第二導通部を介して前記第一裏面配線と電気的に接続され、
前記第三表面配線は、前記第三導通部を介して前記第二裏面配線と電気的に接続され、
前記第四表面配線は、前記第四導通部を介して前記第二裏面配線と電気的に接続され、
前記第一太陽電池の接続電極(9a)が前記第一表面配線と接続され、前記第二太陽電池の裏面電極(8b)が前記第二表面配線と接続されることにより、前記第一太陽電池の集電極(7a)と前記第二太陽電池の裏面電極とが電気的に接続され、
前記第一太陽電池の裏面電極(8a)が前記第三表面配線と接続され、前記第三太陽電池の接続電極(9c)が前記第四表面配線と接続されることにより、前記第一太陽電池の裏面電極が前記第三太陽電池の集電極(7c)と電気的に接続されている、請求項12に記載の太陽電池モジュール。 - 前記第一表面配線は、前記第三表面配線と間隔を隔てて、前記第三表面配線の周囲に設けられている、請求項13に記載の太陽電池モジュール。
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