JP2014183312A - ヘテロ接合相互嵌合型バックコンタクト光起電力電池の製造方法 - Google Patents
ヘテロ接合相互嵌合型バックコンタクト光起電力電池の製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 229910021417 amorphous silicon Inorganic materials 0.000 claims abstract description 162
- 239000000758 substrate Substances 0.000 claims abstract description 52
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims abstract description 40
- 238000000151 deposition Methods 0.000 claims abstract description 19
- 238000005530 etching Methods 0.000 claims abstract description 19
- 230000000873 masking effect Effects 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 229910021419 crystalline silicon Inorganic materials 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000000059 patterning Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 description 11
- 238000002955 isolation Methods 0.000 description 5
- 238000002161 passivation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241001600072 Hydroides Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】パターン化されたp+a−Si:H層を基板に形成すること、このパターン化されたp+a−Si:H層は基板面の第1領域を覆い基板面の第2領域を露出さ電池;第1内側a−Si:H層を基板に堆積すること;n+a−Si:H層を第1内側a−Si:H層に堆積すること;少なくとも第2領域においてn+a−Si:H層を覆うパターン化されたマスキング層を設けること;並びに、マスキング層によって覆われていない領域においてn+a−Si:H層及び第1内側a−Si:H層を選択的に除去すること、それにより下層のp+a−Si:H層を実質的に無影響にする、を備え、ここで、n+a−Si:H層及び第1内側a−Si:H層を選択的に除去することは、希釈したTMAH溶液におけるエッチングステップを行なうことを備える。
【選択図】図7
Description
ある創造性のある態様は、パターン化されたn+a−Si:H層及びパターン化されたp+a−Si:H層を基板に形成する方法に関し、n+a−Si:H層及びp+a−Si:H層は、互いに組み合わされており電気的に互いから分離されている。この方法は、公知の方法に比べてより少ないプロセスステップですみ、製造環境において使用されるのに適している。この方法は、シリコンヘテロ接合相互嵌合型バックコンタクト光起電力電池用の製造プロセスにおいて互いに組み合わされたエミッタ領域及び裏面電界領域を形成するために好適に使用可能である。
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各速度が測定された。p+a−Si:H層に関して、0.1nm/minのオーダーのエッチング速度が得られた。p+a−Si:H層のエッチング速度は実質的に低く、即ち、内側a−Si:H層及びn+a−Si:H層のエッチング速度の約150倍低い。したがって、非常に良好なエッチング選択性が得られ、エッチングプロセスは自己制限的である。
Claims (13)
- パターン化されたn+a−Si:H層及びパターン化されたp+a−Si:H層が互いに組み合わされ互いから電気的に分離された、パターン化されたn+a−Si:H層及びパターン化されたp+a−Si:H層を基板に形成する方法であって、この方法は、
− パターン化されたp+a−Si:H層を基板に形成すること、ここでパターン化されたp+a−Si:H層は基板表面の第1領域をカバーし、基板表面の第2領域を露出させる;
− 第1の内側a−Si:H層を基板に堆積すること;
− 第1の内側a−Si:H層にn+a−Si:H層を堆積すること;
− 少なくとも第2領域でn+a−Si:H層をカバーするパターン化されたマスキング層を設けること;
− マスキング層によってカバーされていない領域においてn+a−Si:H層及び第1の内側a−Si:H層を選択的に除去し、それにより下層のp+a−Si:H層を実質的に無影響にすること;
を備え、
ここで、n+a−Si:H層及び第1の内側a−Si:H層を選択的に除去することは、希釈したTMAH溶液におけるエッチングステップを行なうことを備える、
方法。 - n+a−Si:H層及び第1の内側a−Si:H層を選択的に除去することは、p+a−Si:H層のエッチング速度よりも少なくとも100倍速いエッチング速度でn+a−Si:H層及び第1の内側a−Si:H層をエッチングすることを備える、請求項1に記載の方法。
- 希釈したTMAH溶液は、1%から10%のTMAHを含む溶液である、請求項1又は2に記載の方法。
- エッチングステップは、15℃と30℃との間の温度で行われる、請求項1から3のいずれかに記載の方法。
- n+a−Si:H層及び第1の内側a−Si:H層を選択的に除去する前に、在来の酸化物を除去することをさらに備える、請求項1から4のいずれかに記載の方法。
- p+a−Si:H層を堆積する前に、基板に第2の内側a−Si:H層を設けることをさらに備える、請求項1から5のいずれかに記載の方法。
- パターン化されたp+a−Si:H層を形成することは、パターン化されていないp+a−Si:H層を堆積し、その後p+a−Si:H層をパターニングすることを備え、ここで第2の内側a−Si:H層は、p+a−Si:H層と同じパターンによりパターン化される、請求項6に記載の方法。
- p+a−Si:H層は、5nmと50nmとの間の厚さ及び1020cm−3と1022cm−3との間のドーピングレベルを有する、請求項1から7のいずれかに記載の方法。
- 第1の内側a−Si:H層は、1nmと10nmとの間の厚さを有する、請求項1から請求項8のいずれかに記載の方法。
- n+a−Si:H層は、5nmと50nmとの間の厚さ及び1020cm−3と1022cm−3との間のドーピングレベルを有する、請求項1から請求項9のいずれかに記載の方法。
- 基板は結晶性シリコン基板である、請求項1から請求項10のいずれかに記載の方法。
- シリコンヘテロ接合相互嵌合型バックコンタクト光起電力電池の製造方法であって、
請求項1から11のいずれかによって、パターン化されたn+a−Si:H層及びパターン化されたp+a−Si:H層が互いに組み合わされ互いから電気的に分離された、パターン化されたn+a−Si:H層及びパターン化されたp+a−Si:H層を結晶性シリコン基板に形成することを備え、ここでパターン化されたn+a−Si:H層は、当該電池の裏面電界(BSF)領域を形成し、パターン化されたp+a−Si:H層は当該電池のエミッタ領域を形成する、
方法。 - BSF領域と電気的に接触するベースコンタクト、及びエミッタ領域と電気的に接触するエミッタコンタクトを設けることをさらに備えた、請求項12に記載の方法。
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