JP5349066B2 - Cdバイアスの減少したシリコン含有反射防止コーティング層のエッチング方法 - Google Patents
Cdバイアスの減少したシリコン含有反射防止コーティング層のエッチング方法 Download PDFInfo
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Description
1b 処理システム
1c 処理システム
1d 処理システム
1e 処理システム
10 プラズマ処理チャンバ
20 基板ホルダ
22 電極
25 基板
26 背面ガス供給システム
28 固定システム
30 RF発生装置
32 インピーダンス整合ネットワーク
40 ガス分配システム
45 処理空間
50 真空排気システム
55 制御装置
60 磁場システム
70 電極
72 RF発生装置
74 インピーダンス整合ネットワーク
80 誘導コイル
80’ 誘導コイル
80’’ 表面波プラズマ源
82 RF発生装置
82’ RF発生装置
84 インピーダンス整合ネットワーク
84’ インピーダンス整合ネットワーク
90 直流出力供給体
100 基板
110 薄膜
120 多層マスク
122 マスク層
124 マスク層
126 リソグラフィ層
130 特徴部位のパターン
130’ 特徴部位のパターン
132 CD
132’ CD
142 CD
152 CD
Claims (19)
- 基板上の反射防止コーティング(ARC)層を乾式現像する方法であって:
多層マスクを有する基板をプラズマ処理システム内に設ける工程であって、前記多層マスクはシリコン含有ARC層の上にリソグラフィ層を有し、かつ前記リソグラフィ層は、リソグラフィプロセスを用いて形成された特徴部位のパターンを内部に有する、工程;
前記特徴部位のパターン内の密な構造についての第1限界寸法(CD)バイアスと前記特徴部位のパターン内の疎な構造についての第2CDバイアスとの間のオフセットを減少させるように備えられたプロセスレシピを選択する工程であって、前記第1CDバイアスは、前記リソグラフィ層内の特徴部位のパターンの密な構造についての第1CDと、前記シリコン含有ARC層内の特徴部位のパターンの密な構造についての第2CDとの第1差異の大きさであり、かつ、前記第2CDバイアスは、前記リソグラフィ層内の特徴部位のパターンの疎な構造についての第1CDと、前記シリコン含有ARC層内の特徴部位のパターンの疎な構造についての第2CDとの第2差異の大きさである、工程;
前記プロセスレシピに従って、前記プラズマ処理システムへSF6ガスを含むプロセスガスを導入する工程;
前記プロセスレシピに従って、前記のプラズマ処理システム中のプロセスガスからプラズマを生成する工程;及び、
前記のリソグラフィ層内の特徴部位のパターンを前記下地のシリコン含有ARC層へ転写するため、前記基板を前記プラズマに曝露する工程;
を有する方法。 - 前記プロセスガスがSF6からなる、請求項1に記載の方法。
- 前記プロセスガスがさらに希ガスを有する、請求項1に記載の方法。
- 前記プロセスガスが少なくとも1種類のCxFyHz含有ガスをさらに有し、かつ
xとyは1以上の整数で、zは0以上の整数である、
請求項1に記載の方法。 - 前記のプロセスガスを導入する工程が、CF4、C3F6、C4F6、C4F8、C5F8、又はこれら2種類以上の混合ガスを導入する工程を有する、請求項4に記載の方法。
- 前記プロセスレシピが、前記の第1CDバイアスと第2CDバイアスとの間のオフセットを、10nm未満の値にまで減少させるように選択される、請求項1に記載の方法。
- 前記プロセスレシピを選択する工程は:
前記プラズマ処理チャンバ内のチャンバ圧力を設定する工程;
前記基板を支持する基板ホルダ内部に存在する下部電極へ印加される第1高周波(RF)信号を第1出力レベルに設定する工程;及び
前記基板の上に存在する前記下部電極に対向する上部電極へ印加される第2RF信号を第2出力レベルに設定する工程;
を有する、
請求項1に記載の方法。 - 前記のチャンバ圧力を設定する工程が、圧力を100mTorr以下に設定する工程を有する、請求項7に記載の方法。
- 前記のチャンバ圧力を設定する工程が、圧力を50mTorr以下に設定する工程を有する、請求項7に記載の方法。
- 前記のチャンバ圧力を設定する工程が、圧力を30mTorr以下に設定する工程を有する、請求項7に記載の方法。
- 前記の第1出力レベルを設定する工程が、第1出力レベルを200W未満に設定する工程を有する、請求項7に記載の方法。
- 前記の第1出力レベルを設定する工程が、第1出力レベルを100W未満に設定する工程を有する、請求項7に記載の方法。
- 前記の第2出力レベルを設定する工程が、第2出力レベルを100W〜500Wに設定する工程を有する、請求項7に記載の方法。
- 前記の第2出力レベルを設定する工程が、第2出力レベルを100W〜300Wに設定する工程を有する、請求項7に記載の方法。
- 前記プロセスレシピを選択する工程が、前記プロセスガスの流速を100sccm〜300sccmの範囲の値に設定する工程をさらに有する、請求項1に記載の方法。
- 前記多層マスクと前記基板との間に有機誘電体層(ODL)を形成する工程;及び
前記のシリコン含有ARC層内の特徴部位のパターンを、ドライエッチングプロセスを用いて前記ODLへ転写する工程;
をさらに有する、請求項1に記載の方法。 - 前記ODLと前記基板との間に誘電体層を形成する工程;及び
前記ODL内の特徴部位のパターンを、他のドライエッチングプロセスを用いて前記誘電体層へ転写する工程;
をさらに有する、請求項16に記載の方法。 - 基板上の多層マスクを乾式現像する方法であって:
前記基板上に前記多層マスクを形成する工程であって、前記多層マスクは、有機誘電体層(ODL)の上に存在するシリコン含有ARC層の上にリソグラフィ層を有する、工程;
リソグラフィプロセスを用いることによって前記リソグラフィ層内に特徴部位のパターンを形成する工程;
第1ドライプラズマエッチングプロセスを用いることによって、前記特徴部位のパターンを前記リソグラフィ層から前記シリコン含有ARC層へ転写する工程であって、前記第1ドライプラズマエッチングプロセスは、SF6を有するプロセスガスを導入する工程、前記プロセスガスからプラズマを生成する工程、及び前記プラズマに前記基板を曝露する工程を有する、工程;並びに、
第2ドライプラズマエッチングプロセスを用いることによって、前記特徴部位のパターンを前記シリコン含有ARC層から前記ODL層へ転写する工程であって、前記第2ドライプラズマエッチングプロセスは、CO2を有する第2プロセスガスを導入する工程、前記第2プロセスガスから第2プラズマを生成する工程、及び前記第2プラズマに前記基板を曝露する工程を有する、工程、
を有し、
前記特徴部位のパターン中の密な構造についての第1限界寸法(CD)バイアスと、前記特徴部位のパターン中の疎な構造についての第2限界寸法(CD)バイアスとの間のオフセットを減少させるように前記第1及び第2ドライプラズマエッチングプロセスのプロセス条件が選択され、
前記第1CDバイアスは、前記リソグラフィ層内の特徴部位のパターンの密な構造についての第1CDと、前記ODL内の特徴部位のパターンの密な構造についての第2CDとの第1差異の大きさであり、かつ、前記第2CDバイアスは、前記リソグラフィ層内の特徴部位のパターンの疎な構造についての第1CDと、前記ODL内の特徴部位のパターンの疎な構造についての第2CDとの第2差異の大きさである、
を有する方法。 - 前記第2プロセスガスがO2、He、及びHBrをさらに有する、請求項18に記載の方法。
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US8236700B2 (en) * | 2009-08-17 | 2012-08-07 | Tokyo Electron Limited | Method for patterning an ARC layer using SF6 and a hydrocarbon gas |
US8288271B2 (en) * | 2009-11-02 | 2012-10-16 | International Business Machines Corporation | Method for reworking antireflective coating over semiconductor substrate |
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US8334083B2 (en) | 2011-03-22 | 2012-12-18 | Tokyo Electron Limited | Etch process for controlling pattern CD and integrity in multi-layer masks |
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