JP2018531522A - 太陽電池素子、その製造方法及びそれからなる太陽電池パック - Google Patents
太陽電池素子、その製造方法及びそれからなる太陽電池パック Download PDFInfo
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- 239000010410 layer Substances 0.000 claims description 230
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical group [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 26
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 24
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- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
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- 229910052984 zinc sulfide Inorganic materials 0.000 description 4
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- 230000008021 deposition Effects 0.000 description 3
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
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- -1 titanium oxide compound Chemical class 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- 229910004613 CdTe Inorganic materials 0.000 description 1
- 229910000927 Ge alloy Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000003667 anti-reflective effect Effects 0.000 description 1
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- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
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- 229910052763 palladium Inorganic materials 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
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Abstract
Description
この出願は、2015年10月19日に出願された出願番号が201510679909.9で、発明名称が「太陽電池素子、その製造方法及びそれからなる太陽電池パック」である中国特許出願の優先権を主張し、その開示のすべてをここに取り込む。
前記エミッタ層とパッシベーション層との間に設置された界面層をさらに含み、前記N型接点が前記エミッタ層、界面層、及びパッシベーション層を貫通して前記ベース層を露出させ、前記P型接点が前記パッシベーション層を貫通して前記界面層を露出させる太陽電池素子を提供する。
S2、エッチングして前記界面層とエミッタ層を貫通するアレイ状に分布された複数の逆円錐台状の溝を形成するステップであって、但し、前記逆円錐台状の溝の底部がベース層で、前記逆円錐台状の溝の側壁と水平面との夾角である鋭角αは5°≦α≦85°であるステップと、
S3、ステップS2に基づいてパッシベーション層を形成し、マスキング工程によって逆円錐台状の溝の内部に確保したN型接点の位置を覆うことで、界面層の上方にパッシベーション層を形成して、逆円錐台状の溝の側壁に側壁パッシベーション層を形成するステップであって、但し、前記側壁パッシベーション層と前記ベース層との間に逆円錐台状のベース電極溝が形成されるステップと、
S4、エッチングして前記パッシベーション層を貫通する、アレイ状に分布される、底部が界面層である複数のエミッタ電極溝を形成するステップと、
S5、前記逆円錐台状のベース電極溝の内部にN型接点を形成し、前記エミッタ電極溝の内部にP型接点を形成するステップと、
S6、ベース、バッファ層、徐放層を剥離して除去して太陽電池素子を得るステップと、を含む太陽電池素子の製造方法を提供する。
前記ステップS4において、ドライエッチング又はウェットエッチングでエミッタ電極溝をエッチングし、
前記ステップS6において、ベース、バッファ層、徐放層を剥離して除去した後、ウィンド層の前記ベース層から離れる側に反射防止コーティング層を形成することが好ましい。
本発明は新規の太陽電池素子を提供することをその目的とし、太陽電池素子に間隔をあけて設置されたP型接点アレイとN型接点アレイを設置し、前記N型接点は逆円錐台状で、前記N型接点の側壁と水平面との夾角である鋭角αは5°≦α≦85°である。逆円錐台状の溝の側面がそのベース層と一定の傾斜角を有するので、側壁パッシベーション層の製造難度を顕著に低減し、同時に、このように製造される逆円錐台状のベース電極によると、ベース電極溝を製造することで表面の欠陥の増加を低減し、電池の暗電流を低減し、電池の効率を向上させる。
バッファ層2の堆積:有機金属化学気相成長法技術(MOCVD)でGaAsベース1上にGaAsバッファ層2を堆積する。ここで、バッファ層2の構造は1層又は複数層の構造とすることができる。バッファ層の作用は、GaAsベース1と最終の光電変換ユニット半導体との間に中央媒体層を提供することで、従って、各種のエピタキシャル層を形成する際、格子不一致による欠陥中心及び格子応力への影響を低減し、それゆえに、各種の異なる格子構造のエピタキシャル層をエピタキシャル成長させることができ、例えば約150nm〜250nmの厚み区間のGaAsバッファ層2はGaAsの各種のドープ構造に基づく光電池に適用される。
Claims (18)
- 積み重ねて設置されたウィンド層(4)と、ベース層(5)と、エミッタ層(6)と、パッシベーション層(8)とを含む太陽電池素子であって、
間隔をあけて設置されたN型接点(12)アレイとP型接点(13)アレイとが設置され、前記N型接点(12)が前記エミッタ層(6)と前記パッシベーション層(8)とを貫通し、前記P型接点(13)が前記パッシベーション層(8)を貫通することを特徴とする太陽電池素子。 - 前記エミッタ層(6)と前記パッシベーション層(8)との間に設置される界面層(7)をさらに含み、前記N型接点(12)が前記エミッタ層(6)、前記界面層(7)、及び前記パッシベーション層(8)を貫通して前記ベース層(5)を露出させ、前記P型接点(13)が前記パッシベーション層(8)を貫通して前記界面層(7)を露出させることを特徴とする請求項1に記載の太陽電池素子。
- 前記N型接点(12)の開口端の横断面の面積がその底部の横断面の面積より大きいことを特徴とする請求項1又は2に記載の太陽電池素子。
- 前記N型接点(12)が逆円錐台状をなすことを特徴とする請求項1又は2に記載の太陽電池素子。
- 前記N型接点(12)の側壁と水平面との夾角である鋭角αが5°≦α≦85°であることを特徴とする請求項4に記載の太陽電池素子。
- 前記N型接点(12)の側壁の外側に前記パッシベーション層(8)が延長してなる側壁パッシベーション層(10)が設置されることを特徴とする請求項5に記載の太陽電池素子。
- 隣り合うN型接点(12)アレイとP型接点(13)アレイとによって接点アレイ組を構成し、前記接点アレイ組の数量は偶数であって、前記太陽電池素子の中心線の一方の側に設置される接点アレイ組のN型接点(12)アレイとP型接点(13)アレイとはそれぞれ、他方の側に設置された接点アレイ組のP型接点(13)アレイとN型接点(12)アレイと鏡像配列されることを特徴とする請求項6に記載の太陽電池素子。
- 隣り合うN型接点(12)アレイとP型接点(13)アレイとによって接点アレイ組を構成し、前記接点アレイ組の数量は奇数であって、中央接点アレイ組の中心線の一方の側に設置されるN型接点(12)アレイとP型接点(13)アレイとはそれぞれ、他方の側に設置される接点アレイ組のP型接点(13)アレイとN型接点(12)アレイと鏡像配列されることを特徴とする請求項6に記載の太陽電池素子。
- 前記N型接点(12)アレイと前記P型接点(13)アレイとが等間隔に設置されることを特徴とする請求項1又は2に記載の太陽電池素子。
- ヒ化ガリウム薄膜太陽電池であることを特徴とする請求項9に記載の太陽電池素子。
- 前記ウィンド層(4)の前記ベース層(5)から離れる側に設置された反射防止コーティング層(15)をさらに含むことを特徴とする請求項1又は2に記載の太陽電池素子。
- 少なくとも二つの請求項1又は2に記載の太陽電池素子を含み、隣り合う前記太陽電池素子の対応する位置のN型接点(12)アレイとP型接点(13)アレイとが電気的に接続されて直列接続を形成することを特徴とする直列接続された太陽電池パック。
- 各前記太陽電池素子とそれに隣り合う太陽電池素子とが逆平行に設置されることを特徴とする請求項12に記載の太陽電池パック。
- 前記太陽電池素子のN型接点(12)アレイとそれに隣り合う太陽電池素子のP型接点(13)アレイとが電極接続線(14)を介して電気的に接続され、P型接点(13)アレイとそれに隣り合う太陽電池素子のN型接点(12)アレイとが電極接続線(14)を介して電気的に接続されることを特徴とする請求項12に記載の太陽電池パック。
- S1、ベース(1)上に順にバッファ層(2)、徐放層(3)、ウィンド層(4)、ベース層(5)、エミッタ層(6)、及び界面層(7)を形成するステップと、
S2、前記界面層(7)と前記エミッタ層(6)とを貫通するアレイ状に分布された複数の逆円錐台状の溝をエッチングして形成するステップであって、前記逆円錐台状の溝の底部がベース層(5)であり、前記逆円錐台状の溝の側壁と水平面との夾角である鋭角αが5°≦α≦85°であるステップと、
S3、ステップS2に基づいてパッシベーション層(8)を形成し、マスキング工程により前記逆円錐台状の溝の内部に確保したN型接点(12)の位置を覆って、前記界面層(7)の上方にパッシベーション層(8)を形成し、前記逆円錐台状の溝の側壁に側壁パッシベーション層(10)を形成するステップであって、前記側壁パッシベーション層(10)と前記ベース層(5)との間に逆円錐台状のベース電極溝が形成されるステップと、
S4、前記パッシベーション層(8)を貫通する、アレイ状に分布された、底部が前記界面層(7)である複数のエミッタ電極溝をエッチングして形成するステップと、
S5、前記逆円錐台状のベース電極溝の内部にN型接点(12)を形成し、前記エミッタ電極溝の内部にP型接点(13)を形成するステップと、
S6、ベース(1)、バッファ層(2)、及び徐放層(3)を剥離して除去して太陽電池素子を得るステップと、を含む、
ことを特徴とする太陽電池素子の製造方法。 - 前記ステップS2において、ドライエッチング又はウェットエッチングの等方性エッチングの方法で、前記逆円錐台状の溝をエッチングし、
前記ステップS4において、ドライエッチング又はウェットエッチングで前記エミッタ電極溝をエッチングすることを特徴とする請求項15に記載の太陽電池素子の製造方法。 - 前記ステップS3において、前記界面層(7)の上方にパッシベーション層(8)を形成し、前記逆円錐台状の溝の側壁に側壁パッシベーション層(10)を形成し、その後、ベース電極の形成に用いられるように、エッチング工程によって前記逆円錐台状の溝の底部のパッシベーション層をエッチングして除去し、前記ベース層(5)を露出させ、前記側壁パッシベーション層(10)と前記ベース層(5)との間に前記逆円錐台状のベース電極溝が形成されることを特徴とする請求項15に記載の太陽電池素子の製造方法。
- 前記ステップS6が、
ベース(1)、バッファ層(2)、及び徐放層(3)を剥離して除去した後、前記ウィンド層(4)の前記ベース層(5)から離れる側に反射防止コーティング層(15)を形成することをさらに含むことを特徴とする請求項15〜17のいずれか1項に記載の太陽電池素子の製造方法。
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