JP2017524251A - シリコン薄膜太陽電池のためのバックコンタクトシステムの製造方法 - Google Patents
シリコン薄膜太陽電池のためのバックコンタクトシステムの製造方法 Download PDFInfo
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- JP2017524251A JP2017524251A JP2017503537A JP2017503537A JP2017524251A JP 2017524251 A JP2017524251 A JP 2017524251A JP 2017503537 A JP2017503537 A JP 2017503537A JP 2017503537 A JP2017503537 A JP 2017503537A JP 2017524251 A JP2017524251 A JP 2017524251A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000010409 thin film Substances 0.000 title claims description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 12
- 229910052710 silicon Inorganic materials 0.000 title claims description 12
- 239000010703 silicon Substances 0.000 title claims description 12
- 238000000034 method Methods 0.000 claims abstract description 42
- 238000005530 etching Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims description 15
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 238000010330 laser marking Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 238000010894 electron beam technology Methods 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002161 passivation Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 16
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 15
- 239000000758 substrate Substances 0.000 description 8
- 239000011787 zinc oxide Substances 0.000 description 8
- 239000004642 Polyimide Substances 0.000 description 6
- 229920001721 polyimide Polymers 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000007704 wet chemistry method Methods 0.000 description 1
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Abstract
Description
2 絶縁層
3 Si−吸収層
4 エミッタ層
5 ZnO:Al層
6 ラック層
7 Al層
KA 吸収層のコンタクトホール
KE エミッタのコンタクトホール
L1 絶縁線のレーザスクライブ
L2 KAのレーザマーキング
L3 KEのレーザマーキング
L4 Al層のレーザ切断
L5 KAのレーザドーピング
Claims (12)
- シリコン−吸収層と、エミッタ層とから形成されたpn接合部を備えたシリコン薄膜太陽電池のためのバックコンタクトシステムの製造法であって、少なくとも以下の方法ステップ、すなわち、
−前記エミッタ層上に有機的な絶縁層を被着するステップ、
−次いで前記絶縁層内に、前記吸収層および前記エミッタ層にまでコンタクトホールを形成するステップ、
−次いで前記コンタクトホールを絶縁するステップ、
−その後に前記コンタクトホール内に、nコンタクトおよびpコンタクトを形成するために低融点金属層を被着するステップ、および
−nコンタクト領域およびpコンタクト領域の金属層をレーザ切断により分離するステップ
を有する、シリコン薄膜太陽電池のためのバックコンタクトシステムの製造法において、
−前記エミッタ層に前記有機的な絶縁層を被着する前に、TCO層を被着するステップ、
−前記シリコン−吸収層へのコンタクト用のホールを前記絶縁層内に生ぜしめるステップであって、この場合に、まず前記シリコン−吸収層へのコンタクトの予定箇所において、前記有機的な絶縁層内に、パルス化されたUVレーザを用いて、一貫した材料除去なしにマーキングを生ぜしめ、該マーキングを次いで少なくとも1回の湿式化学的な選択的なエッチングステップにおいて、まず前記TCO層にまでエッチングし、次いで少なくとも1回の別のエッチングステップにおいて前記エミッタ層を貫通して前記シリコン−吸収層までエッチングする、ステップと、
−次いで前記有機的な絶縁層内に、パルス化されたUVレーザにより、一貫した材料除去なしにマーキングを生ぜしめ、該マーキングを湿式化学的な選択的なエッチングステップにおいて前記TCO層までエッチングするステップ、および
−その後に前記シリコン−吸収層に対するコンタクトのために生ぜしめられた前記ホールを選択的にドーピングするステップ、
を有することを特徴とする、シリコン薄膜太陽電池のためのバックコンタクトシステムの製造法。 - 前記吸収層および前記エミッタ層への前記コンタクトホールを形成するために、前記絶縁層内で一貫した材料除去なしに前記マーキングを生ぜしめるための、前記パルス化されたUVレーザは、5J/cm2〜50J/cm2のレーザフルエンスを有している、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- エッチングストップ層として働く前記TCO層の材料として、50nm〜500nmの厚さの、アルミニウムをドーピングしたZnOまたはITOを使用する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- シリコン−吸収層として、レーザまたは電子ビームにより再結晶化された、2μm〜40μmの厚さの多結晶のシリコン層を使用する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- エミッタ層として、5nm〜50nmの厚さの非晶質のシリコン層を使用する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- エミッタ層として、0.1μm〜2μmの厚さの多結晶のシリコン層を使用する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記吸収層の材料として、p型導電性シリコンを使用し、前記吸収層−コンタクトホールの選択的なドーピングのための方法ステップとして、レーザによるアルミニウム焼成を実施する、請求項1から6までの少なくともいずれか1項記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記吸収層の材料として、n型導電性シリコンを使用し、前記吸収層−コンタクトホールの選択的なドーピングのための方法ステップとして、レーザによるリン酸焼成またはアンチモン焼成を実施する、請求項1から6までの少なくともいずれか1項記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記少なくとも1回の湿式化学的な選択的なエッチングステップにおいて、前記シリコン−吸収層および前記エミッタ層への前記コンタクトホールの形成のための前記レーザマーキングを、約1.5%のKOH溶液中で、10分までの時間間隔にわたってエッチングする、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記少なくとも1回の湿式化学的な選択的なエッチングステップにおいて、前記レーザマーキングの領域において開放された前記TCO層を、HF溶液を用いた少なくとも1回の別のエッチングステップにおいて完全に除去し、その後にこれにより露出したエミッタ層を、HF溶液中のKMnO4により、必要となる深さまで除去する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記エミッタ層に被着された前記有機的な絶縁層のために、同時に反射層として役立つ白色のラック層を使用する、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
- 前記Si−吸収層と、前記エミッタ層との間に、真性の非晶質Si−パッシベーション層が配置されている、請求項1記載の薄膜太陽電池のためのバックコンタクトシステムの製造法。
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