JP7075537B2 - プラズマ処理方法 - Google Patents
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Description
被エッチング材に対してマスク材に堆積膜を選択的に堆積させるプラズマ処理方法において、
前記マスク材のインキュベーション時間が前記被エッチング材のインキュベーション時間より短くなるようにエッチングパラメータを制御するとともに前記被エッチング材および前記マスク材に堆積膜を堆積させるガスを用いることにより達成される。
上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。
本実施形態では、ガスによらず選択比を向上させ、かつ、ラフネスを低減させる技術として、マスク材と被エッチング材構造の僅かな違いでも発生するインキュベーション時間の差に着目し、それぞれの表面に形成する堆積膜の膜厚を制御する。インキュベーション時間とは、成膜開始から、生じた成膜種が臨界核の大きさまで拡大して膜として出現するまでの時間である。また、この時間は、マスク材と被エッチング材の膜構造にわずかな組成の違いしかない場合でも変化する。つまり、インキュベーション時間の差を利用することで選択的に堆積膜を堆積させることが可能となる。
また、被エッチング材に対して、マスク材に堆積膜を選択的に堆積させるプラズマ処理方法において、前記マスク材のインキュベーション時間が前記被エッチング材のインキュベーション時間より短くなるように、かつ、被エッチング材に堆積膜を堆積させないように、プラズマエッチングパラメータを制御すると好ましい。
更に、被エッチング材に対して、マスク材に堆積膜を選択的に堆積させるプラズマ処理方法において、前記マスク材のインキュベーション時間が前記被エッチング材のインキュベーション時間より短くなるように、かつ、被エッチング材に堆積膜を堆積させず、エッチングが進行するように、プラズマエッチングパラメータを制御すると好ましい。
図2に、EUVリソグラフィで形成されたレジストをマスク材とした場合のエッチング進行過程を示す。本実施例では、OPL(Organic Planarization Layer:有機平坦化層)201上に成膜されたSiARC202上にEUVレジスト203をパターニングする構造のサンプルを使用したが、SOC(Spin On Carbon)上に成膜されたSOG上にEUVレジストがパターニングされた構造のサンプルなどを使用しても良い。
図11に、DSAリソグラフィ技術で形成された場合のエッチング進行過程を示す。本実施例では、SiN111上に成膜されたNUL112上にPMMA113およびPS114をパターニングする構造のサンプルを使用した。
Claims (8)
- 被エッチング材に対してマスク材に堆積膜を選択的に堆積させるプラズマ処理方法において、
前記マスク材のインキュベーション時間が前記被エッチング材のインキュベーション時間より短くなるようにエッチングパラメータを制御するとともに前記被エッチング材および前記マスク材に堆積膜を堆積させるガスを用い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、
前記エッチングパラメータの制御は、パルス変調された第一の高周波電力によりプラズマを生成する工程と、
前記被エッチング材が成膜された試料を載置する試料台にパルス変調された第二の高周波電力を供給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、
前記マスク材をEUVレジストとし、前記被エッチング材をSiARCと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、
前記マスク材をPSとし、前記被エッチング材をPMMAと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、
前記ガスは、アルゴンガスと窒素ガスとメタンガスの混合ガスであ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、
前記ガスは、アルゴンガスと窒素ガスとメタンガスの混合ガスであ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、
前記第一の高周波電力を変調するパルスの周期と前記第二の高周波電力を変調するパルスの周期は、等しく、
前記第一の高周波電力を変調するパルスのデューティー比は、前記第二の高周波電力を変調するパルスのデューティー比より大きいことを特徴とするプラズマ処理方法。 - 請求項7に記載のプラズマ処理方法において、
前記マスク材をEUVレジストとし、前記被エッチング材をSiARCとすることを特徴とするプラズマ処理方法。
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