JP2019057638A - 電界効果トランジスタの製造方法 - Google Patents
電界効果トランジスタの製造方法 Download PDFInfo
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- JP2019057638A JP2019057638A JP2017181482A JP2017181482A JP2019057638A JP 2019057638 A JP2019057638 A JP 2019057638A JP 2017181482 A JP2017181482 A JP 2017181482A JP 2017181482 A JP2017181482 A JP 2017181482A JP 2019057638 A JP2019057638 A JP 2019057638A
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- Prior art keywords
- insulating film
- etching
- resist mask
- opening
- resist
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Classifications
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- H01L29/41766—Source or drain electrodes for field effect devices with at least part of the source or drain electrode having contact below the semiconductor surface, e.g. the source or drain electrode formed at least partially in a groove or with inclusions of conductor inside the semiconductor
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- Engineering & Computer Science (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
Description
Claims (5)
- ゲート電極を備える電界効果トランジスタの製造方法であって、
基板上に成長した半導体層の表面を覆う絶縁膜を形成する工程と、
前記ゲート電極のための開口パターンを有するレジストマスクを前記絶縁膜上に形成する工程と、
前記開口パターンを介して前記絶縁膜をエッチングすることにより前記絶縁膜に凹部を形成する第1エッチング工程と、
前記レジストマスクを酸素プラズマに曝す工程と、
前記レジストマスクを熱処理する工程と、
前記開口パターンを介して前記絶縁膜を更にエッチングすることにより前記絶縁膜に開口を形成して前記半導体層の表面を露出させたのち前記レジストマスクを除去する第2エッチング工程と、
露出した前記半導体層の表面上、及び前記開口の周囲の前記絶縁膜上に前記ゲート電極を形成する工程と、
を含む、電界効果トランジスタの製造方法。 - 前記レジストマスクを前記酸素プラズマに曝す工程において、前記酸素プラズマは、前記開口パターンの幅を少なくとも5nm広げる、請求項1に記載の電界効果トランジスタの製造方法。
- 前記第1エッチング工程において、前記凹部の深さを少なくとも5nmとする、請求項1または2に記載の電界効果トランジスタの製造方法。
- 前記第2エッチング工程におけるエッチング時間は、前記凹部が形成されていない場合の前記絶縁膜の全厚をエッチングするのに要する時間以上である、請求項1〜3のいずれか1項に記載の電界効果トランジスタの製造方法。
- 前記第1エッチング工程におけるエッチング時間は、前記絶縁膜の全厚の5%増ないし15%増の厚さを有する絶縁膜に開口を形成するために必要なエッチング時間から、前記凹部下に残存した前記絶縁膜に開口を形成するために必要なエッチング時間を差し引いた時間である、請求項4に記載の電界効果トランジスタの製造方法。
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US16/137,078 US10529574B2 (en) | 2017-09-21 | 2018-09-20 | Process of forming electron device having gate electrode |
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