JP2014060394A - 入射光の反射率を低減させるための単結晶半導体基体のテクスチャー化 - Google Patents
入射光の反射率を低減させるための単結晶半導体基体のテクスチャー化 Download PDFInfo
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- JP2014060394A JP2014060394A JP2013175631A JP2013175631A JP2014060394A JP 2014060394 A JP2014060394 A JP 2014060394A JP 2013175631 A JP2013175631 A JP 2013175631A JP 2013175631 A JP2013175631 A JP 2013175631A JP 2014060394 A JP2014060394 A JP 2014060394A
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Abstract
【解決手段】単結晶半導体基体は、アルカリ溶液によりテクスチャー化されて、その表面上にピラミッド構造を形成し、入射光の反射率を低減し、ウェハの光吸収を改善する。アルカリ浴は、ヒダントイン化合物及びその誘導体を、アルコキシル化グリコールと一種以上のアルカリ化合物とを組み合わせて含み、ピラミッド構造間の平坦領域の形成を防止し、光吸収を改善する。
【選択図】図2
Description
HO(CxH2xO)mH (II)
HO(CH2CH2O)nH (III)
好ましくは、テクスチャー化溶液に含まれるアルカリ化合物は、1種以上の水酸化物から選択される。より好ましくは、アルカリ化合物は、1種以上のアルカリ金属水酸化物、例えば、水酸化ナトリウムおよび水酸化カリウムから選択される。アルカリ化合物は、溶液の0.5重量%から15重量%の量で、テクスチャー化溶液に含まれる。好ましくは、アルカリ化合物は、1重量%から10重量%の量で、テクスチャー化溶液に含まれる。
表側またはエミッタ層上にn+ドープ領域を有し、エミッタ層の下にpn接合を有する、2枚のドープされた単結晶シリコン半導体ウェハ(SolarGigaから入手)を、表1に示される2種類のテクスチャー化溶液の1つでテクスチャー化した。
4種類の水性テクスチャー化溶液を、以下の表2に示されるように調製した。表側またはエミッタ層上にn+ドープ領域を有し、およびエミッタ層の下にpn接合を有する、4枚の単結晶シリコン半導体ウェハ(Solar Gigaから得られた)を、従来の実験室のはかりを使用して秤量した。ついで、各ウェハを、4種類のテクスチャー化溶液の1つに、75℃で30分間浸した。テクスチャー化溶液のpHは13であった。ついで、ウェハを、それらの各テクスチャー化溶液から取り出し、水ですすいで、空気乾燥させた。ついで、各ウェハを秤量し、片面あたりのエッチングされたシリコンの量を、以下の表2に示されるように決定した。
2種類の水性テクスチャー化溶液を、以下の表3に示されるように調製した。表側またはエミッタ層上にn+ドープ領域を有し、かつエミッタ層の下にpn接合を有する、2枚の単結晶シリコン半導体ウェハ(SolarGigaから入手)を、従来の実験室のはかりで秤量した。ついで、各ウェハを、2種類のテクスチャー化溶液の1つに、75℃で30分間浸した。ついで、これらウェハを、それらの各テクスチャー化溶液から取り出し、水ですすぎ、空気乾燥させた。ついで、各ウェハを秤量し、片面あたりのエッチングされたシリコンの量を、以下の表3に示されるように決定した。
テクスチャー化溶液への添加剤をイソプロピルアルコール(IPA)としたこと以外は、上記実施例6〜7に記載の処理を繰り返した。その結果を、表4に示す。
ヒダントイン、ジメチルヒダントインまたは2−チオヒダントイン、17.85g/Lの水酸化ナトリウムおよび1.2重量%のトリプロピレングリコールを含む、11種類の水性テクスチャー化溶液を調製した。表側またはエミッタ層上にn+ドープ領域を有し、かつエミッタ層の下にpn接合を有する、11枚の単結晶シリコン半導体ウェハ(SolarGigaから入手)を、従来の実験室のはかりで秤量した。ついで、各ウェハを、11種類のテクスチャー化溶液の1つに、75℃で30分間浸した。溶液のpHは、13〜14の範囲であった。ついで、これらウェハを、それらの各テクスチャー化溶液から取り出し、水ですすぎ、空気乾燥させた。ついで、各ウェハを秤量し、片面あたりのエッチングされたシリコンの量を、以下の表5に示されるように測定した。
テクスチャー化溶液への添加剤を、以下の表6に示される複素環化合物としたこと以外は、実施例10〜20に記載の処理を繰り返した。各テクスチャー化溶液は、17.85g/Lの水酸化ナトリウムおよび1.2重量%のトリプロピレングリコールも含んだ。エッチング時間を30分とし、テクスチャー化溶液の温度を75℃とした。各溶液のpHは13〜14の範囲であった。
テクスチャー化溶液への添加剤を、以下の表7に示される複素環化合物としたこと以外は、実施例10〜20に記載の処理を繰り返した。各テクスチャー化溶液は、17.85g/Lの水酸化ナトリウムおよび、0.3重量%でトリプロピレングリコールを含む実施例34以外は、1.2重量%のトリプロピレングリコールも含む。エッチング時間を30分とし、テクスチャー化溶液の温度を75℃とした。各溶液のpHは、13〜14の範囲とした。
テクスチャー化溶液への添加剤を、以下の表8に示される化合物としたこと以外は、実施例10〜20に記載の処理を繰り返した。比較例40、41、42および43は、11g/L、14.5g/L、21.5g/Lおよび25g/Lの水酸化ナトリウムもそれぞれ含んだ。残りの溶液は、17.85g/Lの水酸化ナトリウムを含んだ。各溶液は、0.6重量%および0.9重量%の量で、トリプロピレングリコールをそれぞれ含んだ比較例44および45以外は、1.2重量%のトリプロピレングリコールも含んだ。エッチング時間を30分とし、テクスチャー化溶液の温度を75℃とした。各溶液のpHは、13〜14の範囲とした。
テクスチャー化溶液への添加剤を、以下の表9に示される化合物としたこと以外は、実施例10〜20に記載の処理を繰り返した。各溶液は、17.85g/Lの水酸化ナトリウムおよび1.2重量%のトリプロピレングリコールも含んだ。エッチング時間を30分とし、テクスチャー化溶液の温度を75℃とした。各溶液のpHは、13〜14の範囲とした。
テクスチャー化溶液への添加剤を、以下の表10に示される化合物としたこと以外は、実施例10〜20に記載の処理を繰り返した。各溶液は、17.85g/Lの水酸化ナトリウムおよび1.2重量%のトリプロピレングリコールも含んだ。エッチング時間を30分とし、テクスチャー化溶液の温度を75℃とした。各溶液のpHは、13〜14の範囲とした。
Claims (10)
- a)単結晶半導体基体を提供する工程と、
b)ヒダントインおよびヒダントイン誘導体から選択される1種以上の化合物、1種以上のアルコキシル化グリコール、ならびに1種以上のアルカリ化合物を含む組成物を提供する工程と、
c)前記単結晶半導体基体を前記組成物に接触させて、前記単結晶半導体基体を異方性にテクスチャー化する工程と
を含む方法。 - 前記1種以上のヒダントインおよびヒダントイン誘導体が、前記組成物の0.005重量%から0.09重量%の範囲である、請求項1に記載の方法。
- 前記1種以上のアルコキシル化グリコールが、100g/モル以上の分子量を有する、請求項1に記載の方法。
- 前記溶液が1種以上の脱酸素剤をさらに含む請求項1に記載の方法。
- 前記溶液が1種以上の有機溶媒をさらに含む請求項1に記載の方法。
- ヒダントインおよびヒダントイン誘導体から選択される1種以上の化合物、1種以上のアルコキシル化グリコール、ならびに1種以上のアルカリ化合物を含む組成物。
- 前記1種以上のヒダントインおよびヒダントイン誘導体が、前記組成物の0.005重量%から0.09重量%の範囲である、請求項6に記載の組成物。
- 1種以上の脱酸素剤をさらに含む、請求項6に記載の組成物。
- 1種以上の有機溶媒をさらに含む、請求項6に記載の組成物。
- 前記組成物のpHが13〜14である請求項6に記載の組成物。
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JPWO2014112430A1 (ja) * | 2013-01-15 | 2017-01-19 | 三菱瓦斯化学株式会社 | シリコンエッチング液およびエッチング方法並びに微小電気機械素子 |
JP2018117068A (ja) * | 2017-01-19 | 2018-07-26 | 信越化学工業株式会社 | 高光電変換効率太陽電池の製造方法 |
JP2020126997A (ja) * | 2019-02-05 | 2020-08-20 | 株式会社トクヤマ | シリコンエッチング液及び該エッチング液を用いたシリコンデバイスの製造方法 |
JP2021136429A (ja) * | 2020-02-27 | 2021-09-13 | 株式会社トクヤマ | シリコンエッチング液、該エッチング液を用いたシリコンデバイスの製造方法および基板処理方法 |
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KR101727555B1 (ko) * | 2013-01-11 | 2017-04-17 | 사켐,인코포레이티드 | 비수 용매 내 4차 암모늄 히드록사이드의 색 억제제 |
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US9303207B2 (en) | 2016-04-05 |
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KR101829630B1 (ko) | 2018-03-29 |
JP6279254B2 (ja) | 2018-02-14 |
US20140284529A1 (en) | 2014-09-25 |
US20140065836A1 (en) | 2014-03-06 |
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SG2013064662A (en) | 2014-03-28 |
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