JPWO2020122259A1 - プラズマ処理方法及びプラズマ処理装置 - Google Patents
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Abstract
Description
る手法について説明する。
下層のエッチング工程(S309)においては、先ず、装置制御部42でガス供給部33を制御して、エッチング用ガス36を所定の流量で処理室31に供給する。エッチング用ガス36が供給されて処理室31の内部が所定の圧力になった状態で、装置制御部42で高周波電源37を制御して、高周波印加部41に高周波電力52を印加して、処理室31の内部にエッチング用ガス36によるプラズマを発生させる。
Claims (11)
- 試料に成膜された被エッチング膜をプラズマエッチングするプラズマ処理方法において、
前記試料に形成されたパターンの上部に保護膜を選択的に形成し、前記形成された前記保護膜の幅の前記試料の面内における分布が所望の分布となるように前記形成された前記保護膜の幅を調整する保護膜形成工程と、
前記保護膜形成工程後、前記被エッチング膜をプラズマエッチングする工程とを有することを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記保護膜形成工程は、前記保護膜が形成された前記試料から反射された干渉光のスペクトルをモニタし、前記試料の面内における前記保護膜の幅の分布が所望の分布である場合の前記試料から反射された干渉光のスペクトルのパターンと前記モニタされた前記干渉光のスペクトルのパターンとの比較結果に基づいて前記保護膜の幅を調整することを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記保護膜形成工程は、前記試料の面内における前記保護膜の膜厚の分布が所望の分布となるように前記保護膜の前記膜厚をさらに調整することを特徴とするプラズマ処理方法。 - 請求項2に記載のプラズマ処理方法において、
前記保護膜形成工程は、前記被エッチング膜の前記試料の面内における前記保護膜の膜厚の分布が所望の分布である場合の前記保護膜が形成された前記試料から反射された前記干渉光のスペクトルのパターンと前記モニタされた前記干渉光のスペクトルのパターンとの比較結果に基づいて前記形成された前記保護膜の前記膜厚をさらに調整することを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記パターンは、溝のパターンであり、
前記被エッチング膜は、前記溝に埋め込まれていることを特徴とするプラズマ処理方法。 - 請求項2に記載のプラズマ処理方法において、
上部に前記保護膜を選択的に形成した前記試料上に形成された前記パターンは、溝のパターンであり、
前記被エッチング膜は、前記溝に埋め込まれていることを特徴とするプラズマ処理方法。 - 請求項1乃至6のいずれか一項に記載のプラズマ処理方法において、
前記所望の分布は、前記試料の面内にて均一な分布であることを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記保護膜形成工程と前記被エッチング膜をプラズマエッチングする工程とを繰り返すことにより所望の深さまで前記被エッチング膜をプラズマエッチングすることを特徴とするプラズマ処理方法。 - 請求項3に記載のプラズマ処理方法において、
前記保護膜の膜厚が飽和している場合、前記被エッチング膜がプラズマエッチングされる処理室をプラズマクリーニングすることを特徴とするプラズマ処理方法。 - 試料に成膜された被エッチング膜をマスクを用いてプラズマエッチングする処理室と、プラズマを生成するための高周波電力を供給する高周波電源と、前記試料が載置される試料台とを備えるプラズマ処理装置において、
前記試料に形成されたパターンの上部に保護膜を選択的に形成し、前記形成された前記保護膜の幅の前記試料の面内における分布が所望の分布となるように前記形成された前記保護膜の幅を調整する保護膜形成工程と、前記保護膜形成工程後、前記被エッチング膜をプラズマエッチングする工程とを実行する制御部をさらに備えることを特徴とするプラズマ処理装置。 - 試料に成膜された被エッチング膜をマスクを用いてプラズマエッチングする処理室と、プラズマを生成するための高周波電力を供給する高周波電源と、前記試料が載置される試料台とを備えるプラズマ処理装置において、
前記試料に形成されたパターンの上部に保護膜を選択的に形成し、前記形成された前記保護膜の膜厚の前記試料の面内における分布が所望の分布となるように前記形成された前記保護膜の膜厚を調整する保護膜形成工程と、前記保護膜形成工程後、前記被エッチング膜をプラズマエッチングする工程とを実行する制御部をさらに備えることを特徴とするプラズマ処理装置。
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