JP2015043470A - エッチング処理方法 - Google Patents
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- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
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Abstract
Description
10 基板処理装置
12 サセプタ
15 処理室
18 第1の高周波電源
20 第2の高周波電源
40 SiO2膜
41 カーボン膜
42 SiON膜
43 BARC膜
44,51,60 ホール
45 フォトレジスト膜
55 プラズマ生成用の高周波電力
56 イオン引き込み用の高周波電力
58 ポリシリコン膜
59 残渣膜
Claims (14)
- 内部にプラズマが生じる処理室、該処理室内部に配置された載置台及び該載置台に対向して前記処理室内部に配置された電極を備え、前記処理室内部に比較的周波数の高い第1の高周波電力が印加され、前記載置台に前記第1の高周波電力よりも周波数が低い第2の高周波電力が印加され、前記電極に直流電力が印加される基板処理装置において、
エッチング対象膜と、該エッチング対象膜上に形成されたマスク膜とを有し、且つ前記載置台に載置された基板にエッチング処理を施すエッチング処理方法であって、
前記マスク膜を用いて前記エッチング対象膜をプラズマでエッチングして前記エッチング対象膜にパターンを形成する対象膜エッチングステップを有し、
前記対象膜エッチングステップでは、前記直流電力を前記電極に印加するとともに、少なくとも前記第2の高周波電力を前記載置台にパルス波状に印加し、前記直流電力が前記電極に印加されている間に前記第2の高周波電力が前記載置台に印加されない状態を作り出すことにより、前記基板の表面上に発生するシースを消滅させて前記直流電力が印加される前記電極から生じる電子を前記パターンへ進入させることを特徴とするエッチング処理方法。 - 前記対象膜エッチングステップでは、前記第1の高周波電力もパルス波状に印加して前記第1の高周波電力が前記処理室内部に印加されない状態を作り出すことを特徴とする請求項1記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、前記第1の高周波電力と前記第2の高周波電力とを同期させてパルス波状に印加することを特徴とする請求項2記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、前記基板に生じるバイアス電圧の電位よりも低い電位で前記直流電力を前記電極に印加することを特徴とする請求項1乃至3のいずれか1項に記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、前記第2の高周波電力を前記載置台に、周波数が1KHz〜50KHzのいずれかのパルス波状に印加することを特徴とする請求項1乃至4のいずれか1項に記載のエッチング処理方法。
- 前記周波数が10KHz〜50KHzのいずれかであることを特徴とする請求項5記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、パルス波状に印加される前記第2の高周波電力のデューティー比が10%〜90%のいずれかであることを特徴とする請求項1乃至6のいずれか1項に記載のエッチング処理方法。
- 前記デューティー比が50%〜90%のいずれかであることを特徴とする請求項7記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、前記第2の高周波電力が前記載置台に印加されない状態が少なくとも5マイクロ秒継続することを特徴とする請求項1乃至8のいずれか1項に記載のエッチング処理方法。
- 前記対象膜エッチングステップにおいて前記エッチング対象膜に形成されるパターンのアスペクト比は30以上であることを特徴とする請求項1乃至9のいずれか1項に記載のエッチング処理方法。
- 前記マスク膜は有機膜であることを特徴とする請求項1乃至10のいずれか1項に記載のエッチング処理方法。
- 前記マスク膜は無機膜であることを特徴とする請求項1乃至10のいずれか1項に記載のエッチング処理方法。
- 前記無機膜は少なくともポリシリコン膜を含むことを特徴とする請求項12記載のエッチング処理方法。
- 前記対象膜エッチングステップでは、少なくともヘリウムガスを含む混合ガスからプラズマを生成することを特徴とする請求項1乃至13のいずれか1項に記載のエッチング処理方法。
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