JP2012023339A - 半導体装置の製造方法 - Google Patents
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Abstract
【解決手段】トレンチ3を形成した後の洗浄工程の薬液5として、キレート剤を添加した過酸化水素水とアンモニア水と水の混合液を用いる。これにより、超音波等の外力を加えること無く、トレンチ3の底部まで確実に洗浄を行うことが可能となる。そして、このような洗浄工程を行えることから、アスペクト比が5以上のトレンチ3を形成しても、確実にトレンチ3の底部まで保護膜4を含む異物の洗浄除去を行うことができる。
【選択図】図1
Description
本発明の第1実施形態について説明する。本実施形態では、半導体基板に対して大きなアスペクト比のトレンチを形成する半導体装置の製造方法について説明するが、半導体装置の製造方法のうち、大きなアスペクト比のトレンチを形成した後に実施するトレンチ内の洗浄工程以外については、従来と同様であるため、ここではその洗浄工程について説明する。
本発明の第2実施形態について説明する。本実施形態では、第1実施形態で説明したトレンチ内の洗浄工程が適用される半導体装置の製造方法の一例として、スーパージャンクション構造が備えられる半導体装置の製造方法について説明する。図8および図9に、本実施形態にかかる半導体装置の製造工程を示した断面図を示し、これらの図を参照して説明する。
上記実施形態では、BOSCHプロセスによって大きなアスペクト比のトレンチ3を形成した場合について説明した。これは、特にBOSCHプロセスによって大きなアスペクト比のトレンチ3を形成する場合に本発明を適用するのが有効であるという意味で説明を行ったに過ぎず、BOSCHプロセスによらずにトレンチ3を形成し、その後、洗浄工程を行う際に本発明を適用するようにしても勿論良い。特に、BOSCHプロセスによれば、トレンチ3のアスペクト比を大きくできることから、このようなBOSCHプロセスに本発明を適用すると好ましいが、BOSCHプロセスに限らず、薬液が入り込みにくくなる幅10μm以下のトレンチ3においてアスペクト比が5以上となる場合に、本発明を適用すると特に好ましい。
2 マスク
3 トレンチ
4 保護膜
5 薬液
6 酸化膜
10 n+型シリコン基板
11 n-型エピタキシャル層
12 酸化膜
13 トレンチ
14 保護膜
15 p型シリコン層
16 トレンチ
17 ゲート絶縁膜
18 ゲート電極
19 n+型ソース領域
20 p+型ボディ層
Claims (8)
- シリコンもしくはシリコン系化合物半導体からなる半導体基板(1、10)に対して凹部(3、13)を形成する凹部形成工程と、
前記凹部(3、13)を形成する工程の後に行われ、前記凹部(3、13)内に存在する保護膜(4、14)を含む異物を取り除く洗浄工程と、を含み、
前記洗浄工程では、キレート剤を添加した過酸化水素水と塩基性薬液と水を混合した混合液を薬液(5)として用いることを特徴とする半導体装置の製造方法。 - 前記洗浄工程において、前記薬液(5)に含まれる前記塩基性薬液として、アンモニア水またはTMAHを用いることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記凹部形成工程では、幅が10μm以下で、かつ、アスペクト比が5以上となるように前記凹部(3、13)を形成することを特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記凹部形成工程では、前記凹部(3、13)の側壁面を保護膜(4、14)で覆いながら前記凹部(3、13)の底面を掘り進める手法によって前記凹部(3、13)を形成することを特徴とする請求項1ないし3のいずれか1つに記載の半導体装置の製造方法。
- 前記洗浄工程では、前記過酸化水素水に対して前記キレート剤を0.5〜1.5重量%添加していることを特徴とする請求項1ないし4のいずれか1つに記載の半導体装置の製造方法。
- 前記洗浄工程では、前記薬液(5)の温度を50℃以上かつ100℃以下にすることを特徴とする請求項1ないし5のいずれか1つに記載の半導体装置の製造方法。
- 前記洗浄工程では、前記薬液(5)として、前記キレート剤を添加した過酸化水素水とアンモニア水と水を混合した混合液の混合比率が、1:1:4〜1:1:6の範囲であるものを用いていることを特徴とする請求項2に記載の半導体装置の製造方法。
- 前記洗浄工程では、前記薬液(5)として、前記キレート剤を添加した過酸化水素水とTMAHと水を混合した混合液の混合比率が、1:1:4〜1:1:6の範囲であるものを用いていることを特徴とする請求項2に記載の半導体装置の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2011115742A JP5278492B2 (ja) | 2010-06-16 | 2011-05-24 | 半導体装置の製造方法 |
US13/151,367 US9011604B2 (en) | 2010-06-16 | 2011-06-02 | Manufacturing method of semiconductor device |
DE102011077410A DE102011077410A1 (de) | 2010-06-16 | 2011-06-10 | Herstellungsverfahren für Halbleitervorrichtung |
CN201110161985.2A CN102290368B (zh) | 2010-06-16 | 2011-06-16 | 半导体装置的制造方法 |
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JP2010137228 | 2010-06-16 | ||
JP2010137228 | 2010-06-16 | ||
JP2011115742A JP5278492B2 (ja) | 2010-06-16 | 2011-05-24 | 半導体装置の製造方法 |
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JP2012023339A true JP2012023339A (ja) | 2012-02-02 |
JP5278492B2 JP5278492B2 (ja) | 2013-09-04 |
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US (1) | US9011604B2 (ja) |
JP (1) | JP5278492B2 (ja) |
CN (1) | CN102290368B (ja) |
DE (1) | DE102011077410A1 (ja) |
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US9250534B2 (en) | 2012-07-13 | 2016-02-02 | Tokyo Ohka Kogyo Co., Ltd. | Nonaqueous cleaning liquid and method for etching processing of silicon substrate |
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KR101867998B1 (ko) * | 2011-06-14 | 2018-06-15 | 삼성전자주식회사 | 패턴 형성 방법 |
CN104037206B (zh) * | 2013-03-08 | 2017-02-15 | 上海华虹宏力半导体制造有限公司 | 超级结器件及制造方法 |
US20160064213A1 (en) * | 2013-04-18 | 2016-03-03 | Tohoku University | Method for treating inner wall surface of micro-vacancy |
CN111659665B (zh) * | 2020-05-29 | 2022-02-01 | 徐州鑫晶半导体科技有限公司 | 硅片的清洗方法及硅片的清洗设备 |
CN115440575A (zh) * | 2022-09-01 | 2022-12-06 | 杭州中欣晶圆半导体股份有限公司 | 一种降低硅片表面金属的清洗方法 |
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JP2000091290A (ja) * | 1998-09-09 | 2000-03-31 | Nec Corp | 半導体装置の製造方法 |
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DE102011077410A1 (de) | 2012-01-19 |
US20120000484A1 (en) | 2012-01-05 |
CN102290368B (zh) | 2015-02-25 |
US9011604B2 (en) | 2015-04-21 |
CN102290368A (zh) | 2011-12-21 |
JP5278492B2 (ja) | 2013-09-04 |
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