JP7462444B2 - エッチング方法及びプラズマ処理装置 - Google Patents
エッチング方法及びプラズマ処理装置 Download PDFInfo
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Description
そこで、以下説明する一実施形態では、窒化シリコンの劣化を防止しながら酸化シリコンをエッチングする方法を提案する。図2は、一実施形態に係るエッチング方法を示すフローチャートである。図3は、一実施形態に係るプラズマ処理装置10を示す断面模式図である。図3は、図2に示すエッチング方法(以下、「方法MT」という)において用いることが可能な一実施形態に係るプラズマ処理装置10の一例を示す。
次に、プラズマ処理装置10にて実行可能な方法MTについて説明する。方法MTの実行時のプラズマ処理装置10の各部の動作は、制御部80によって制御され得る。方法MTでは、まず、図2のステップS1において、載置台14に、第1領域R1と第2領域R2を有する基板Wを準備する。次に、ステップS2において、基板の表面状態のモニタを開始する。方法MT中にエッチングにより生成される副生成物が第1領域R1及び第2領域R2に付着し、堆積物となる。ステップS2ではこの堆積物の厚さを制御部80によりモニタする。モニタ方法は、基板Wに照射する光の反射により堆積物の厚さを測定可能な測定装置を使用して実行することができる。ただし、堆積物の厚さの測定は、これに限られず、その他の公知の方法により実行してもよい。
以下、方法MTの評価のために行った種々の実験例について説明する。以下に説明する実験例は単に例示のために示されるものであって、本発明を限定するものではない。
以上説明した方法MTの変形例について説明する。方法MTでは、ステップS3とステップS4のエッチング処理は、順に繰り返し実行した。しかし、ステップS3とステップS4のエッチング処理は、同時に実行してもよい。この場合にも、ステップS6において堆積物DPの厚さが閾値以上になった場合には、ステップS7の除去処理が実行される。
方法MTは、他の対象膜のエッチングに適用することができる。図12は、方法MTのエッチング対象膜の他の一例を示す断面図である。図12は、第1領域R1及び第2領域R2を有する基板W2を示す。この基板W2に対して方法MTを用いることができる。具体的に、基板W2は、下地層200、複数の隆起領域202、第1領域R1、第2領域R2及びマスク208を有している。基板W2は、例えば、フィン型電界効果トランジスタの製造中に得られる生産物であり得る。
Claims (13)
- (a)酸化シリコンから形成された第1領域と、窒化シリコンから形成された第2領域とを有する基板を準備する工程と、
(b)前記基板をフルオロカーボンガス及び酸素ガスを含む第1の処理ガスから生成したプラズマに晒し、前記第1領域をエッチングし、前記第1領域及び前記第2領域の上にフルオロカーボンを含む堆積物を形成する工程と、
(c)前記堆積物に含まれるフルオロカーボンのラジカルにより前記第1領域及び前記第2領域をエッチングする工程と、
(d)酸素を含まない第2の処理ガスから生成したプラズマにより前記堆積物を除去する工程と、を含む、エッチング方法。 - (a)酸化シリコンから形成された第1領域と、窒化シリコンから形成された第2領域とを有する基板を準備する工程と、
(b)前記基板をフルオロカーボンガス及び酸素ガスを含む第1の処理ガスから生成したプラズマに晒し、前記第1領域をエッチングし、前記第1領域及び前記第2領域の上にフルオロカーボンを含む堆積物を形成する工程と、
(c)前記基板を希ガスから生成したプラズマに晒し、前記第1領域及び前記第2領域をエッチングする工程と、
(d)酸素を含まない第2の処理ガスから生成したプラズマにより前記堆積物を除去する工程と、を含む、エッチング方法。 - 前記第2の処理ガスは、フッ素含有ガスを含む、
請求項1または請求項2に記載のエッチング方法。 - 前記第2の処理ガスは、CF4ガス、NF3ガス又はSF6を含む、
請求項3に記載のエッチング方法。 - 前記第2の処理ガスは、N2ガスを含む、
請求項1乃至請求項4のいずれか一項に記載のエッチング方法。 - 前記(b)の工程と前記(c)の工程とは、繰り返される、
請求項1乃至請求項5のいずれか一項に記載のエッチング方法。 - 前記(b)の工程と前記(c)の工程とは、同時に実行される、
請求項1乃至請求項5のいずれか一項に記載のエッチング方法。 - 前記(d)の工程は、チャンバ内にて基板を載置する第1電極に対向する第2電極に高周波電力を印加し、前記第1電極に高周波電力を印加しない、
請求項1乃至請求項7のいずれか一項に記載のエッチング方法。 - (e)堆積物の厚さをモニタする工程を含み、
前記(d)の工程は、前記(e)の工程にてモニタした前記堆積物の厚さが予め定められた閾値以上になったタイミングに実行される、
請求項1乃至請求項8のいずれか一項に記載のエッチング方法。 - 前記(d)の工程において、上部電極にプラズマ生成用の高周波電力を供給し、下部電極には高周波電力を供給しない、
請求項1乃至請求項9のいずれか一項に記載のエッチング方法。 - チャンバ内にて基板を載置する第1電極と、前記第1電極に対向する第2電極と、制御部と、を有するプラズマ処理装置であって、
前記制御部は、
(a)酸化シリコンから形成された第1領域と、窒化シリコンから形成された第2領域とを有する前記基板を準備する工程と、
(b)前記基板をフルオロカーボンガス及び酸素ガスを含む第1の処理ガスから生成したプラズマに晒し、前記第1領域をエッチングし、前記第1領域及び前記第2領域の上にフルオロカーボンを含む堆積物を形成する工程と、
(c)前記堆積物に含まれるフルオロカーボンのラジカルにより前記第1領域及び前記第2領域をエッチングする工程と、
(d)酸素を含まない第2の処理ガスから生成したプラズマにより前記堆積物を除去する工程と、を制御する、プラズマ処理装置。 - チャンバ内にて基板を載置する第1電極と、前記第1電極に対向する第2電極と、制御部と、を有するプラズマ処理装置であって、
前記制御部は、
(a)酸化シリコンから形成された第1領域と、窒化シリコンから形成された第2領域とを有する前記基板を準備する工程と、
(b)前記基板をフルオロカーボンガス及び酸素ガスを含む第1の処理ガスから生成したプラズマに晒し、前記第1領域をエッチングし、前記第1領域及び前記第2領域の上にフルオロカーボンを含む堆積物を形成する工程と、
(c)前記基板を希ガスから生成したプラズマに晒し、前記第1領域及び前記第2領域をエッチングする工程と、
(d)酸素を含まない第2の処理ガスから生成したプラズマにより前記堆積物を除去する工程と、を制御する、プラズマ処理装置。 - 前記制御部は、
前記(d)の工程において前記第2電極に高周波電力を印加し、前記第1電極に高周波電力を印加しない、
請求項11または請求項12に記載のプラズマ処理装置。
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