JP5224444B2 - 太陽電池における有害な分極の防止 - Google Patents
太陽電池における有害な分極の防止 Download PDFInfo
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- JP5224444B2 JP5224444B2 JP2007558005A JP2007558005A JP5224444B2 JP 5224444 B2 JP5224444 B2 JP 5224444B2 JP 2007558005 A JP2007558005 A JP 2007558005A JP 2007558005 A JP2007558005 A JP 2007558005A JP 5224444 B2 JP5224444 B2 JP 5224444B2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
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Description
本発明は、一般に太陽電池に関し、特に、太陽電池の構造、モジュール、製造、及びフィールド設置に関する(但しこれらに限定されない)。
本出願は、2005年3月3日にファイリングされた米国特許仮出願第60/658,706の利益を請求し、その仮出願全体が参照によって本明細書内に組み込まれる。
太陽電池(ソーラーセル)は、太陽放射を電気的エネルギーに変換するための周知のデバイスである。半導体処理技術を用いて、半導体ウェーハ上にそれらを製造することができる。一般的にいえば、p型領域とn型領域とを1つのシリコン基板内に形成することにより、太陽電池を製造することができる。各近傍のp型領域とn型領域とは、pn接合を形成する。太陽電池上に当る太陽放射が、電子と正孔とを生じさせ、それらがp型及びn型領域に移動し、それにより、pn接合間に電位差が生じる。裏面コンタクト太陽電池内において、p型領域とn型領域とが、該太陽電池の裏面上の金属コンタクトに結合され、それにより、外部電子回路又はデバイスが、該太陽電池に結合されることが可能となり、該太陽電池によって電力供給されることが可能となる。裏面コンタクト太陽電池はまた、米国特許第5,053,083号、及び第4,927,770号において開示されており、それら特許は両方とも、その全体が参照によって本明細書内に組み込まれる。
一実施形態において、太陽電池の前面側からウェーハのバルクに電荷を抜き出す(ブリードする)導電経路を提供することによって、有害な太陽電池分極が防止されるか又は最小化される。該導電経路には、例えば、誘電性パッシベーション層内か、導電性反射防止コーティング内か、又は反射防止コーティングの表面上又は底面上に形成された導電性材料の層内におけるパターン化された正孔を含めることができる。有害な太陽電池分極を、該太陽電池の前面側上の太陽電池モジュールの領域をバイアスさせることによって防止することもまた可能である。
本発明の開示において、本発明の実施例の完全な理解を提供するために、装置、構成要素、及び方法、の例のような、多くの特定の詳細部が提供されている。しかしながら、1つか又は複数のその特定の詳細部がなくても、本発明を実施することができることが、当業者であれば認識されるであろう。他の例において、本発明の態様を不明瞭にすることを避けるため、周知の詳細部が示されてないか又は説明されていない。
Claims (8)
- 前面側と裏面側とを有する太陽電池であって、前記太陽電池の前記前面側は、通常動作中、太陽に面しており、前記太陽電池が、
前記太陽電池の前記裏面側上に形成された複数の金属コンタクトであって、前記複数の金属コンタクトの各々が、前記太陽電池における、対応するp型ドープされたか又はn型ドープされた収集領域に結合されている、複数の金属コンタクトと、
前記太陽電池の前記前面側に面しているシリコンウェーハの表面上に直接的に形成された誘電性パッシベーション層と、
前記誘電性パッシベーション層上に形成された導電性反射防止コーティングと、
前記太陽電池の前記前面側から前記シリコンウェーハのバルクへと電荷を抜き出すことによって、前記太陽電池における有害な分極を防止するよう構成された導電性経路
とを備え、
前記誘電性パッシベーション層の表面と、前記導電性反射防止コーティングの表面とに直接的に接触する、前記導電性反射防止コーティングと前記誘電性パッシベーション層との間に形成された導電材料の層を更に含む、太陽電池。 - 前記導電性経路が、前記誘電性パッシベーション層を含み、前記誘電性パッシベーション層が、10〜20オングストロームの厚みを有する二酸化ケイ素を含む、請求項1に記載の太陽電池。
- 金属不純物がドープされた反射防止材料を、前記反射防止コーティングが含む、請求項1に記載の太陽電池。
- 前記反射防止コーティングが、もともと導電性である、請求項1に記載の太陽電池。
- 通常動作中に太陽に面する前記反射防止コーティングの表面上に直接的に形成された導電性コーティングを、前記導電性経路が含む、請求項1に記載の太陽電池。
- 前記反射防止コーティングの表面上に直接的に形成された導電性材料の層を更に含む、請求項1に記載の太陽電池。
- 前記反射防止コーティング上に形成された透過性の電気的絶縁体を更に含む、請求項1に記載の太陽電池。
- 前記導電性経路が、前記誘電性パッシベーション層を通じてパターン成形された正孔を含む、請求項1から7のいずれか1項に記載の太陽電池。
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