JP2011523230A - ポリシリコンドープ領域を有するバックコンタクト型太陽電池のトレンチプロセス及び構造 - Google Patents
ポリシリコンドープ領域を有するバックコンタクト型太陽電池のトレンチプロセス及び構造 Download PDFInfo
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- JP2011523230A JP2011523230A JP2011513520A JP2011513520A JP2011523230A JP 2011523230 A JP2011523230 A JP 2011523230A JP 2011513520 A JP2011513520 A JP 2011513520A JP 2011513520 A JP2011513520 A JP 2011513520A JP 2011523230 A JP2011523230 A JP 2011523230A
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- doped region
- type doped
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- 238000000034 method Methods 0.000 title claims description 49
- 229910021420 polycrystalline silicon Inorganic materials 0.000 title claims description 47
- 229920005591 polysilicon Polymers 0.000 title claims description 47
- 239000000758 substrate Substances 0.000 claims abstract description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 239000010703 silicon Substances 0.000 claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 52
- 239000000377 silicon dioxide Substances 0.000 claims description 26
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 24
- 238000002161 passivation Methods 0.000 claims description 24
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 24
- 239000002019 doping agent Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000009792 diffusion process Methods 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000005215 recombination Methods 0.000 abstract description 5
- 230000006798 recombination Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 14
- 238000005530 etching Methods 0.000 description 9
- 235000012431 wafers Nutrition 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000001505 atmospheric-pressure chemical vapour deposition Methods 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 101100207343 Antirrhinum majus 1e20 gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
【選択図】図1
Description
Claims (20)
- 通常動作時に太陽に向けられるよう設けられた前面及び前記前面に対向する裏面を有するシリコン基板と、
ポリシリコンを含むP型ドープ領域及びN型ドープ領域と、
前記基板上の前記P型ドープ領域及び前記N型ドープ領域それぞれの下に設けられる第1の誘電体層と、
前記N型ドープ領域から前記P型ドープ領域を分離するトレンチと、
前記トレンチに形成される第2の誘電体層と
を備える太陽電池構造。 - 前記第1の誘電体層は、前記シリコン基板の表面に5から40オングストロームの厚さで形成される二酸化シリコンを含む請求項1に記載の太陽電池構造。
- 前記トレンチは、前記太陽電池の前記裏面に入射する太陽放射を吸収するテクスチャ表面を有する請求項1に記載の太陽電池構造。
- 前記第2の誘電体層と前記基板との間に、パッシベーション層をさらに備える請求項1に記載の太陽電池構造。
- 前記トレンチの下の基板に拡散パッシベーション領域をさらに備え、
前記パッシベーション領域は、N型ドーパントでドープされている請求項1に記載の太陽電池構造。 - 前記第2の誘電体層を貫通して前記P型ドープ領域及び前記N型ドープ領域と電気的に接続されるインターデジテイト加工された金属接触子をさらに備える請求項1に記載の太陽電池構造。
- 太陽電池基板の上に第1の誘電体層を形成する工程と、
前記太陽電池基板は、通常動作時に太陽に向けられるよう設けられた前面及び前記前面に対向する裏面を有するN型シリコンウエハを含み、前記太陽電池基板の前記裏面側であって前記第1の誘電体層の上にP型ドープ領域及びN型ドープ領域を形成する工程と、
前記P型ドープ領域及び前記N型ドープ領域との間を分離するトレンチを形成する工程と、
前記トレンチ内に第2の誘電体層を堆積する工程と
を備える太陽電池を製造する方法。 - 前記トレンチは、前記P型ドープ領域及び前記N型ドープ領域が形成される前に形成される請求項7に記載の方法。
- 前記第2の誘電体層は、窒化シリコンを含む請求項7に記載の方法。
- 前記太陽電池基板の前記裏面側で、第1の金属接触子を前記P型ドープ領域と電気的に接続する工程と、
前記太陽電池基板の前記裏面側で、第2の金属接触子を前記N型ドープ領域と電気的に接続する工程と
をさらに備える請求項7に記載の方法。 - 前記P型ドープ領域は、前記第1の誘電体層上に堆積される前にP型ドーパントでプリドープされるポリシリコンを含み、前記N型ドープ領域は、前記第1の誘電体層上に形成される前にN型ドーパントでプリドープされるポリシリコンを含む請求項7に記載の方法。
- 前記P型ドープ領域を形成する工程は、
ドーパント源からポリシリコン層へとドーパントを拡散する工程を含み、
前記ドーパント源は、前記ポリシリコン層上に形成された層の材料である請求項7に記載の方法。 - 前記ドーパント源は、P型ドープ二酸化シリコン層を含む請求項12に記載の方法。
- 前記トレンチの表面に不規則なテクスチャ加工を施す工程をさらに備える請求項7に記載の方法。
- シリコン基板の裏面側であって誘電体層上に形成されたポリシリコンを含むP型ドープ領域及びN型ドープ領域と、
前記P型ドープ領域と前記N型ドープ領域との間を分離するトレンチ構造と
を備える太陽電池構造。 - 前記シリコン基板は、N型シリコン基板を含む請求項15に記載の構造。
- 前記トレンチの表面は、不規則なテクスチャ加工が施されている請求項15に記載の構造。
- 前記誘電体層は、5から40オングストロームの厚さで形成された二酸化シリコンを含む請求項15に記載の構造。
- 前記トレンチ構造の表面に形成されたパッシベーション層をさらに備える請求項15に記載の構造。
- 前記トレンチ構造の下の前記基板に設けられるパッシベーション領域をさらに含む請求項15に記載の構造。
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