JP6338754B2 - 不活性ガスから生成される準安定ガスを使用する原子層エッチング - Google Patents
不活性ガスから生成される準安定ガスを使用する原子層エッチング Download PDFInfo
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- H01L21/67011—Apparatus for manufacture or treatment
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Description
本発明は、以下の適用例としても実現可能である。
[適用例1]
半導体処理チャンバ内で基板上の層をエッチングするための方法であって、
前記チャンバ内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
前記第1のガスの少なくともいくらかを前記層内に吸着させるのに十分な期間にわたって、前記第1のガスを前記チャンバ内に留めるステップと、
前記チャンバ内の前記第1のガスを不活性ガスで実質的に置き換えるステップと、
前記不活性ガスから準安定ガスを発生させるステップと、
前記準安定ガスで前記層をエッチングするステップと、
を備える、方法。
[適用例2]
適用例1に記載の方法であって、
前記準安定ガスは、前記不活性ガスからプラズマを生成することによって発生される、方法。
[適用例3]
適用例2に記載の方法であって、
前記準安定ガスは、前記プラズマから前記層に移動する間に分離プレート構造を横断する、方法。
[適用例4]
適用例3に記載の方法であって、
前記分離プレート構造は、前記層へのプラズマ荷電種の移動を実質的に防止するように構成された複数の穴を有する、方法。
[適用例5]
適用例3に記載の方法であって、
前記分離プレート構造は、互いに電気的に絶縁された少なくとも2つのプレートから構成され、前記2つのプレートは、前記エッチング中に異なる電位を有する、方法。
[適用例6]
適用例3に記載の方法であって、
前記準安定ガスは、前記プラズマから前記層に移動する間にコリメータプレートも横断し、前記コリメータプレートは、前記基板と前記分離プレート構造との間に設けられる、方法。
[適用例7]
適用例3に記載の方法であって、さらに、
前記準安定ガスを用いた前記エッチング中に、前記分離プレートと前記基板との少なくとも一方を互いに対して移動させるステップを備える、方法。
[適用例8]
適用例1に記載の方法であって、
前記エッチャントガスは少なくともハロゲンを含有し、前記層はSiを含有する、方法。
[適用例9]
適用例1に記載の方法であって、
前記期間は、約0.05秒〜約180秒の間である、方法。
[適用例10]
適用例1に記載の方法であって、
前記準安定ガスを発生させる前記ステップは、前記チャンバ内の前記第1のガスの少なくとも約80%が前記不活性ガスで置き換えられた後に行われる、方法。
[適用例11]
基板上の層をエッチングするための基板処理チャンバを有する基板処理システムであって、
前記エッチング中に前記基板が上に配置されるチャックと、
前記チャンバをプラズマ発生領域と基板処理領域とに分離する分離プレート構造と、
前記プラズマ発生領域内でプラズマを発生させるためのプラズマ源と、
論理回路と、を備え、
前記論理回路は、
前記チャンバ内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
前記第1のガスの少なくともいくらかを前記層内に吸着させるのに十分な期間にわたって、前記第1のガスを前記チャンバ内に留めるステップと、
前記チャンバ内の前記第1のガスを不活性ガスで実質的に置き換えるステップと、
前記不活性ガスから準安定ガスを発生させるステップと、
前記準安定ガスで前記層をエッチングするステップと
を行うためのものである、基板処理システム。
[適用例12]
適用例11に記載の基板処理システムであって、
前記準安定ガスは、前記プラズマ源を使用して前記基板処理領域内で前記不活性ガスからプラズマを生成することによって発生される、基板処理システム。
[適用例13]
適用例12に記載の基板処理システムであって、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記分離プレート構造を横断する、基板処理システム。
[適用例14]
適用例13に記載の基板処理システムであって、
前記分離プレート構造は、前記層へのプラズマ荷電種の移動を実質的に防止するように構成された複数の穴を有する、基板処理システム。
[適用例15]
適用例13に記載の基板処理システムであって、
前記分離プレート構造は、互いに電気的に絶縁された少なくとも2つのプレートから構成され、前記2つのプレートは異なる電位を有する、基板処理システム。
[適用例16]
適用例13に記載の基板処理システムであって、さらに、
コリメータプレートを備え、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記コリメータプレートも横断し、前記コリメータプレートは、前記基板と前記分離プレート構造との間に設けられる、基板処理システム。
[適用例17]
適用例13に記載の基板処理システムであって、さらに、
前記準安定ガスを用いた前記エッチング中に、前記分離プレート構造と前記コリメータプレートと前記基板との少なくとも一方を互いに対して移動させるための作動装置を備える、基板処理システム。
[適用例18]
基板上の層をエッチングするための基板処理チャンバを有する基板処理システムであって、前記基板は、前記エッチング中に前記チャンバ内部でチャック上に配置され、
前記基板処理システムは、
前記チャンバをプラズマ発生領域と基板処理領域とに分離する分離プレート構造と、
前記プラズマ発生領域内でプラズマを発生させるためのプラズマ源と、
論理回路と、を備え、
前記論理回路は、
前記チャンバ内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
前記第1のガスの少なくともいくらかを前記層内に吸着させるのに十分な期間にわたって、前記第1のガスを前記チャンバ内に留めるステップと、
前記プラズマ処理領域内の前記第1のガスを不活性ガスで実質的に置き換えるステップと、
前記プラズマ発生領域内で前記不活性ガスからプラズマを発生させるステップと、
前記プラズマからの準安定ガスを用いて前記層をエッチングするステップと、を行うためのものであり、
前記エッチングは、前記プラズマから前記層へのプラズマ荷電種の移動を実質的に防止しながら行われる、基板処理システム。
[適用例19]
適用例18に記載の基板処理システムであって、
前記分離プレート構造は、前記層へのプラズマ荷電種の移動を実質的に防止するように構成された複数の穴を有する、基板処理システム。
[適用例20]
適用例18に記載の基板処理システムであって、
前記分離プレート構造は、互いに電気的に絶縁された少なくとも2つのプレートから構成され、前記2つのプレートは異なる電位を有する、基板処理システム。
[適用例21]
適用例18に記載の基板処理システムであって、さらに、
コリメータプレートを備え、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記コリメータプレートも横断し、前記コリメータプレートは、前記基板と前記分離プレート構造との間に設けられる、基板処理システム。
Claims (16)
- 基板上の層をエッチングするための基板処理チャンバを有する基板処理システムであって、
前記基板処理チャンバ内の基板を支持するように構成された基板支持部と、
前記基板処理チャンバをプラズマ発生領域と基板処理領域とに分離する分離プレート構造であって、前記分離プレート構造は、少なくともいくつかの中性の準安定ガスが前記分離プレート構造と衝突せずに前記分離プレート構造を通って移動可能であり、エネルギープラズマ種が前記分離プレート構造を通って移動することを実質的に防止するように構成された穴を有する分離プレート構造と、
前記プラズマ発生領域内でプラズマを発生させるためのプラズマ源と、
論理回路を実装する、マイクロプロセッサ、マイクロコントローラ、又はコンピュータと、を備え、
前記マイクロプロセッサ、前記マイクロコントローラ、又は前記コンピュータは、
前記基板処理チャンバ内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
前記第1のガスの少なくともいくらかを前記層に吸着させるのに十分な期間にわたって、前記第1のガスを前記基板処理チャンバ内に留めるステップと、
前記基板処理チャンバ内の前記第1のガスを不活性ガスで実質的に置き換えるステップと、
前記基板処理チャンバ内の前記不活性ガスから中性準安定ガスを発生させるステップと、
前記中性準安定ガスで前記基板処理領域内の前記層をエッチングするステップであって、前記中性準安定ガスは、励起状態の原子を含む、ステップと
を行うためのものである、基板処理システム。 - 請求項1に記載の基板処理システムであって、
前記準安定ガスは、前記プラズマ源を使用して前記プラズマ発生領域内で前記不活性ガスからプラズマを生成することによって発生される、基板処理システム。 - 請求項2に記載の基板処理システムであって、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記分離プレート構造を横断する、基板処理システム。 - 請求項1に記載の基板処理システムであって、
前記準安定ガスを発生させる前記ステップは、前記チャンバ内の前記第1のガスの少なくとも90%が前記不活性ガスで置きかえられた後に行われる、基板処理システム。 - 基板上の層をエッチングするための基板処理チャンバを有する基板処理システムであって、前記基板は、前記エッチング中に前記チャンバ内部でチャック上に配置され、
前記基板処理システムは、
前記チャンバをプラズマ発生領域と基板処理領域とに分離する分離プレート構造であって、中性準安定ガスが前記分離プレート構造を通って移動可能であり、エネルギープラズマ種が前記分離プレート構造を通って移動することを実質的に防止するようにサイズ設定された位置合わせされた穴を有するように構成され、前記中性準安定ガスは、励起状態の原子を含む、分離プレート構造と、
前記プラズマ発生領域内でプラズマを発生させるためのプラズマ源と、
論理回路を実装する、マイクロプロセッサ、マイクロコントローラ、又はコンピュータと、を備え、
前記マイクロプロセッサ、前記マイクロコントローラ、又は前記コンピュータは、
前記チャンバ内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
前記第1のガスの少なくともいくらかを前記層内に吸着させるのに十分な期間にわたって、前記第1のガスを前記チャンバ内に留めるステップと、
前記プラズマ発生領域内の前記第1のガスを不活性ガスで実質的に置き換えるステップと、
前記プラズマ発生領域内で前記不活性ガスからプラズマを発生させるステップと、
前記プラズマからの中性準安定ガスを用いて前記層をエッチングするステップと、を行うためのものであり、
前記エッチングは、前記プラズマから前記層へのプラズマ荷電種の移動を実質的に防止しながら行われる、基板処理システム。 - 基板上の層をエッチングするための基板処理チャンバを有する基板処理システムであって、
前記基板処理チャンバは、プラズマ発生領域と基板処理領域とを有し、
前記プラズマ発生領域は、分離プレート構造によって前記基板処理領域から分離され、
前記基板処理システムは、
前記チャンバを前記プラズマ発生領域と前記基板処理領域とに分離する分離プレート構造であって、中性準安定ガスが前記分離プレート構造を通って移動可能であり、エネルギープラズマ種が前記分離プレート構造を通って移動することを実質的に防止するようにサイズ設定された位置合わせされた穴を有するように構成され、前記中性準安定ガスは、励起状態の原子を含む、分離プレート構造と、
前記プラズマ発生領域内でプラズマを発生させるためのプラズマ源と、
論理回路を実装するマイクロプロセッサ、マイクロコントローラ、又はコンピュータと、を備え、
前記マイクロプロセッサ、前記マイクロコントローラ、又は前記コンピュータは、
前記チャンバの前記基板処理領域内に第1のガスを導入するステップであって、前記ガスが、前記層をエッチングするのに適したエッチャントガスであるステップと、
プラズマ発生領域内に不活性ガスを導入するステップと、
前記プラズマ発生領域内の前記不活性ガスの圧力を前記基板処理領域内の前記エッチャントガスの圧力よりも大きく保ちながら、前記第1のガスの少なくともいくらかを前記層内に吸着させるのに十分な期間にわたって前記チャンバの前記基板処理領域内に前記第1のガスを留めるステップと、
前記期間の経過後に、前記チャンバの前記基板処理領域内の前記第1のガスの少なくとも80%を前記不活性ガスで置きかえるステップと、
前記不活性ガスから準安定ガスを生成するために前記チャンバの前記プラズマ発生領域内でプラズマを発生させるステップと、
前記基板処理領域内の圧力を10mTorrよりも低く保ちながら、前記準安定ガスで前記層をエッチングするステップと、を備える、基板処理システム。 - 請求項6に記載の基板処理システムであって、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記分離プレート構造を横断する、基板処理システム。 - 請求項3,請求項5又は請求項7のいずれか一項に記載の基板処理システムであって、
前記分離プレート構造は、前記層へのプラズマ荷電種の移動を実質的に防止するように構成された複数の穴を有する、基板処理システム。 - 請求項3,請求項5又は請求項7に記載の基板処理システムであって、
前記分離プレート構造は、互いに電気的に絶縁された少なくとも2つのプレートから構成され、前記2つのプレートは、前記プラズマから発するイオンを跳ね返すように選択された異なる電位を有する、基板処理システム。 - 請求項3,請求項5又は請求項7のいずれか一項に記載の基板処理システムであって、さらに、
コリメータプレートを備え、
前記準安定ガスは、前記プラズマから前記層に移動する間に前記コリメータプレートも横断し、前記コリメータプレートは、前記基板と前記分離プレート構造との間に設けられる、基板処理システム。 - 請求項3,請求項5又は請求項7のいずれか一項に記載の基板処理システムであって、前記マイクロプロセッサ、前記マイクロコントローラ、又は前記コンピュータは、さらに、
前記準安定ガスを用いたエッチング中に、前記分離プレートと前記基板との少なくとも一方を互いに対して移動させるように構成される、基板処理システム。 - 請求項1、請求項5又は請求項6のいずれか一項に記載の基板処理システムであって、
前記エッチャントガスは少なくともハロゲンを含有し、前記層はSiを含有する、基板処理システム。 - 請求項1、請求項5又は請求項6のいずれか一項に記載の基板処理システムであって、
前記期間は、0.05秒〜180秒の間である、基板処理システム。 - 請求項1、請求項5又は請求項6のいずれか一項に記載の基板処理システムであって、
前記準安定ガスの励起状態の原子は、前記原子によって前記層に付与される熱運動エネルギーよりも大きいエネルギーを前記層に伝達する、基板処理システム。 - 請求項1、請求項5又は請求項6のいずれか一項に記載の基板処理システムであって、
前記分離プレート構造は、少なくとも60%のプラズマ荷電種の移動が前記層に達するのを防止するように構成された複数の孔を有する、基板処理システム。 - 請求項1、請求項5又は請求項6のいずれか一項に記載の基板処理システムであって、
前記分離プレート構造は、少なくとも95%のプラズマ荷電種の移動が前記層に達するのを防止するように構成された複数の孔を有する、基板処理システム。
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