JP5459957B2 - 背面接触式太陽電池上の導電層の接触分離の方法および太陽電池 - Google Patents
背面接触式太陽電池上の導電層の接触分離の方法および太陽電池 Download PDFInfo
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Description
基板の前面側および基板の背面側を有する半導体基板を提供するステップと、
前記基板の背面側に、エミッタ領域およびベース領域の各々を形成するステップと、
前記基板の背面側の、少なくとも、前記エミッタ領域が前記ベース領域と隣接している境界領域の上部の接合領域に、電気絶縁層を形成するステップと、
前記基板の背面側の領域の少なくとも一部に、金属層を設置するステップと、
前記金属層の少なくとも一部の領域に、エッチングバリア層を設置するステップであって、前記エッチングバリア層は、前記金属層をエッチングするエッチャントに対して、実質的に耐性があるステップと、
前記接合領域の少なくとも一部の領域で、前記エッチングバリア層を局部的に除去するステップと、
前記金属層をエッチングするステップであって、前記金属層は、前記エッチングバリア層が局部的に除去された前記一部の領域で、実質的に除去されるステップと、
を有する方法が提供される。
基板の前面側および基板の背面側を有する半導体基板と、
前記基板の背面側の第1のドーピング種のベース領域、および前記基板の背面側の第2のドーピング種のエミッタ領域と、
前記ベース領域が前記エミッタ領域と隣接している境界領域の上部の接合領域にある誘電体層と、
少なくとも一部の領域で、前記ベース領域と電気的に接触するベース接触部、および少なくとも一部の領域で、前記エミッタ領域と電気的に接触するエミッタ接触部と、
を有する太陽電池であって、
前記ベース接触部およびエミッタ接触部の各々は、前記半導体基板と接する金属層を有し、
前記ベース接触部の金属層は、前記誘電体層の上部では、分離ギャップによって、前記エミッタ領域の金属層から水平方向に離されており、これにより、前記エミッタ接触部とベース接触部とが電気的に分離される太陽電池が提供される。
相互に電気的に絶縁された、ベースおよびエミッタの背面接触部が容易に製作される。接触部は、蒸着金属層と、エッチングバリア層との二層を有する。接触部の分離は、非接触式局部レーザアブレーション、またはエッチングバリア層の局部的エッチング除去処理と、その後の金属層の局部的エッチング除去処理とによって行うことが好ましい。この場合、金属化処理の間に、太陽電池には、機械的な負荷は生じない;
金属層の成膜、およびこの層の表面全体へのエッチングバリア層の成膜には、一つの真空成膜ステップのみが必要となる;
金属接触部は、基板の平坦背面側で分離することができ、シリコンウェハの表面構造化は不要である;
金属接触部の柔軟な形状構成の結果、接触抵抗を低下させることができ、再結合の接触を抑制することができる上、指状接触部に大きな導電性が得られるようになる;
はんだ付け可能なエッチングバリア層を使用した場合、これを接続ストリップとはんだ付けすることにより、簡単に太陽電池をモジュール状に接続することができる。
Claims (17)
- 太陽電池を製作する方法であって、
基板の前面側および基板の背面側を有する半導体基板を提供するステップと、
前記基板の背面側に、エミッタ領域およびベース領域の各々を形成するステップと、
前記基板の背面側の、少なくとも、前記エミッタ領域が前記ベース領域と隣接している境界領域の上部の接合領域に、電気絶縁層を形成するステップと、
前記基板の背面側の領域の少なくとも一部に、金属層を設置するステップと、
前記金属層の少なくとも一部の領域に、エッチングバリア層を設置するステップであって、前記エッチングバリア層は、前記金属層をエッチングするエッチャントに対して、実質的に耐性がある誘電体層であるステップと、
前記接合領域の少なくとも一部の領域で、前記エッチングバリア層を局部的に除去するステップであって、前記エッチングバリア層は、マスキング処理を行わずに、局部的に除去されるステップと、
前記金属層をエッチングするステップであって、前記金属層は、前記エッチングバリア層が局部的に除去された前記一部の領域で、実質的に除去されるステップと、
を有する方法。 - 前記エッチングバリア層は、レーザによって局部的に除去されることを特徴とする請求項1に記載の方法。
- 前記エッチングバリア層は、エッチング液を局部的に設置することにより、局部的に除去されることを特徴とする請求項1に記載の方法。
- 前記エッチングバリア層は、機械的に局部的に除去されることを特徴とする請求項1に記載の方法。
- 前記エッチングバリア層は、前記境界領域から水平方向に離れた領域が、局部的に除去されることを特徴とする請求項1乃至4のいずれか一つに記載の方法。
- 前記エッチングバリア層および/または前記金属層は、蒸着法によってもしくはスパッタリング法によって、成膜されることを特徴とする請求項1乃至5のいずれか一つに記載の方法。
- 前記エッチングバリア層は、蛇行形状の領域に局部的に除去されることを特徴とする請求項1乃至6のいずれか一つに記載の方法。
- 前記エッチングバリア層は、前記エッチングバリア層が除去された領域同士の間の、細長い指状金属化領域が、前記太陽電池の一方の側の端部から反対の側の端部に向かってテーパ状となるように、局部的に除去されることを特徴とする請求項1乃至7のいずれか一つに記載の方法。
- 前記電気絶縁層は、シリコン酸化物および/またはシリコン窒化物を含むことを特徴とする請求項1乃至8のいずれか一つに記載の方法。
- 前記電気絶縁層の上部に、電気的に絶縁された光沢層が設置されることを特徴とする請求項1乃至9のいずれか一つに記載の方法。
- 基板の前面側および基板の背面側を有する半導体基板と、
前記基板の背面側の第1のドーピング種のベース領域、および前記基板の背面側の第2のドーピング種のエミッタ領域と、
前記ベース領域が前記エミッタ領域と隣接している境界領域の上部の接合領域にある誘電体層と、
少なくとも一部の領域で、前記ベース領域と電気的に接触するベース接触部、および少なくとも一部の領域で、前記エミッタ領域と電気的に接触するエミッタ接触部と、
を有する太陽電池であって、
前記ベース接触部およびエミッタ接触部の各々は、前記半導体基板と接する金属層を有し、
前記ベース接触部の金属層は、前記誘電体層の上部では、分離ギャップによって、前記エミッタ領域の金属層から水平方向に離されており、これにより、前記エミッタ接触部とベース接触部とが電気的に分離され、
当該太陽電池は、前記ベース接触部および前記エミッタ接触部の前記両金属層を被覆する誘電体エッチングバリア層を有することを特徴とする太陽電池。 - 前記分離ギャップは、少なくとも一部の領域が、前記境界領域から水平方向に離されていることを特徴とする請求項11に記載の太陽電池。
- 前記ベース接触部の金属層および前記エミッタ接触部の金属層は、前記基板の前面側から実質的に同じ距離で配置されていることを特徴とする請求項11または12に記載の太陽電池。
- 前記エミッタ接触部の金属層および/または前記ベース接触部の金属層は、アルミニウムを含むことを特徴とする請求項11乃至13のいずれか一つに記載の太陽電池。
- さらに、電気的に絶縁された光沢層を有し、該光沢層は、前記誘電体層の少なくとも一部を被覆することを特徴とする請求項11乃至14のいずれか一つに記載の太陽電池。
- 前記分離ギャップは、蛇行形状に形成されることを特徴とする請求項11乃至15のいずれか一つに記載の太陽電池。
- 前記エミッタ接触部および/または前記ベース接触部は、細長い指状に形成され、当該太陽電池の一方の側の端部から、反対側の端部に向かってテーパ化されていることを特徴とする請求項11乃至16のいずれか一つに記載の太陽電池。
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Application Number | Priority Date | Filing Date | Title |
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DE102004050269.2 | 2004-10-14 | ||
DE102004050269A DE102004050269A1 (de) | 2004-10-14 | 2004-10-14 | Verfahren zur Kontakttrennung elektrisch leitfähiger Schichten auf rückkontaktierten Solarzellen und Solarzelle |
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- 2005-10-13 JP JP2007536099A patent/JP5459957B2/ja active Active
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- 2005-10-13 CN CNB2005800350042A patent/CN100524832C/zh active Active
- 2005-10-13 US US11/665,318 patent/US20080035198A1/en not_active Abandoned
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190073367A (ko) * | 2016-10-25 | 2019-06-26 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 고광전변환효율 태양전지 및 고광전변환효율 태양전지의 제조 방법 |
KR102570365B1 (ko) | 2016-10-25 | 2023-08-23 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 고광전변환효율 태양전지 및 고광전변환효율 태양전지의 제조 방법 |
Also Published As
Publication number | Publication date |
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EP1800352A1 (de) | 2007-06-27 |
CN101048875A (zh) | 2007-10-03 |
US20110053312A1 (en) | 2011-03-03 |
CA2583760A1 (en) | 2006-04-27 |
US20140087515A1 (en) | 2014-03-27 |
WO2006042698A1 (de) | 2006-04-27 |
DE102004050269A1 (de) | 2006-04-20 |
KR20070092953A (ko) | 2007-09-14 |
CN100524832C (zh) | 2009-08-05 |
CA2583760C (en) | 2013-08-06 |
AU2005296716B2 (en) | 2012-02-02 |
KR101192548B1 (ko) | 2012-10-17 |
AU2005296716A1 (en) | 2006-04-27 |
US20080035198A1 (en) | 2008-02-14 |
JP2008517451A (ja) | 2008-05-22 |
MX2007004533A (es) | 2008-01-14 |
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