JP7045954B2 - ハードマスク用膜を形成する方法および装置、ならびに半導体装置の製造方法 - Google Patents
ハードマスク用膜を形成する方法および装置、ならびに半導体装置の製造方法 Download PDFInfo
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Description
最初に、実施形態のハードマスク膜の形成方法に至った経緯について説明する。
ハードマスクとしては、SiN膜等のシリコン系のものや、TiN膜のようなメタル系のものが多用されている。
次に、一実施形態に係るハードマスク用膜の形成方法について説明する。
図5は一実施形態に係るハードマスク用膜の形成方法を示すフローチャート、図6A~6Bはその工程断面図である。
次に、以上のように形成されたハードマスク用膜4をハードマスクとして用いた半導体装置の製造方法について説明する。
図11は一実施形態に係る半導体装置の製造方法を示すフローチャート、図12はその工程断面図である。
次に、一実施形態に係るハードマスク用膜の形成に好適な成膜装置の例について説明する。本例の成膜装置は、小型のマイクロ波放射機構を複数有するマイクロ波プラズマ源を用いたマイクロ波プラズマ成膜装置として構成される。
以上、実施形態について説明したが、今回開示された実施形態は、全ての点で例示であって制限的なものではないと考えられるべきである。上記の実施形態は、添付の特許請求の範囲およびその主旨を逸脱することなく、様々な形態で省略、置換、変更されてもよい。
2;エッチング対象膜
3;基板
4;ハードマスク用膜
5;ハードマスク
6;残存部分
100;成膜装置
Claims (16)
- ハードマスク用膜を形成する方法であって、
基体上にエッチング対象膜が形成された基板を準備する工程と、
前記基板上に、ハードマスク用膜を、初期の膜ストレスが引張りストレスとなり、かつ引張りストレスが当該膜の底面から上面にかけて単調増加するように、成膜パラメータを制御しつつ成膜する工程と、
を有する、方法。 - 前記成膜する工程は、CVDにより行われる、請求項1に記載の方法。
- 前記成膜する工程は、プラズマCVDにより行われる、請求項2に記載の方法。
- 前記プラズマCVDを行う際のプラズマは、マイクロ波プラズマである、請求項3に記載の方法。
- 前記成膜パラメータは、成膜ガス流量、圧力、プラズマ密度の少なくとも1種である、請求項3または請求項4に記載の方法。
- 前記ハードマスク用膜は、SiN膜である、請求項1から請求項5のいずれか1項に記載の方法。
- 半導体装置の製造方法であって、
基体上にエッチング対象膜が形成された基板を準備する工程と、
前記基板上に、ハードマスク用膜を、初期の膜ストレスが引張りストレスとなり、かつ引張りストレスが当該膜の底面から上面にかけて単調増加するように、成膜パラメータを制御しつつ成膜する工程と、
前記ハードマスク用膜を所定パターンにエッチングし、ハードマスクを形成する工程と、
前記ハードマスクをマスクとして前記エッチング対象膜をエッチングする工程と、
を有する、方法。 - 前記成膜する工程は、CVDにより行われる、請求項7に記載の方法。
- 前記成膜する工程は、プラズマCVDにより行われる、請求項8に記載の方法。
- 前記プラズマCVDを行う際のプラズマは、マイクロ波プラズマである、請求項9に記載の方法。
- 前記成膜パラメータは、成膜速度、圧力、プラズマ密度の少なくとも1種である、請求項9または請求項10に記載の方法。
- 前記ハードマスク用膜は、SiN膜である、請求項7から請求項11のいずれか1項に記載の方法。
- ハードマスク用膜を成膜する装置であって、
基板を収容する処理容器と、
前記処理容器内で基板を載置する載置台と、
前記載置台上の被処理基板を加熱する加熱部と、
前記処理容器の天壁から前記処理容器内にマイクロ波を導入するマイクロ波導入部と、
前記処理容器内に成膜に用いる成膜ガスを供給するガス供給部と、
前記処理容器内を排気する排気部と、
制御部と、
を有し、
前記マイクロ波により成膜ガスのプラズマを生成し、該プラズマにより前記ハードマスク用膜を成膜し、
前記制御部は、ハードマスク用膜の初期の膜ストレスが引張りストレスとなり、かつ引張りストレスが当該膜の底面から上面にかけて単調増加するように、成膜パラメータを制御する、装置。 - 前記マイクロ波導入部は、
マイクロ波を出力するマイクロ波出力部と、
前記マイクロ波出力部からマイクロ波が給電され、インピーダンス整合を行うチューナと、給電されたマイクロ波を放射するスロットを有する平面アンテナと、前記スロットから放射されたマイクロ波を透過するマイクロ波透過板とを有する複数のマイクロ波放射機構と、
を有する、請求項13に記載の装置。 - 前記成膜パラメータは、成膜ガス流量、圧力、プラズマ密度の少なくとも1種である、請求項13または請求項14に記載の装置。
- 前記成膜ガスは、窒素含有ガスおよびSi原料ガスであり、ハードマスク用膜としてSiN膜を形成する、請求項13から請求項15のいずれか1項に記載の装置。
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| JP2009246129A (ja) | 2008-03-31 | 2009-10-22 | Tokyo Electron Ltd | プラズマcvd窒化珪素膜の成膜方法及び半導体集積回路装置の製造方法 |
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