JP6195528B2 - プラズマ処理装置及びその運転方法 - Google Patents
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Description
前記プラズマ処理装置の前回の運転終了からの時間間隔が所定間隔を超えたときに、前記所定の出力よりも小さい出力を有する第2の高周波電力を前記電極に間欠的に複数回供給する電荷蓄積工程を行ってから前記プラズマ処理を行う。
該処理室内にプラズマガスを供給するプラズマガス供給手段と、
前記プラズマガスからプラズマを生成するために前記処理室内に導入する電界及び/又は磁界を発生させるための電極と、
該電極に高周波電力を可変で供給可能である高周波電源と、
前記処理室内での前回の前記プラズマ処理の終了時からの経過時間を計測する時間計測手段と、
前記プラズマ処理を開始させるための操作スイッチと、
該操作スイッチが操作され、前記プラズマ処理を開始するときに、前記時間計測手段により計測された前記経過時間が所定の時間間隔より短いときには、前記高周波電源の前記高周波電力を所定の処理用高周波電力に設定して前記プラズマ処理を直ちに行い、前記経過時間が前記所定の時間間隔より長いときには、前記高周波電源の前記高周波電力を前記所定の処理用高周波電力よりも小さい電荷蓄積用高周波電力を間欠的に複数回前記電極に供給する電荷蓄積制御を行った後に前記プラズマ処理を行う制御手段と、を有する。
次に、プラズマ処理装置において、プラズマが発生し難くなった状態が、どのように引き起こされるかを調べるために行った実験結果について説明する。
次いで、本発明の実施形態に係るプラズマ処理装置及びその運転方法を実施した実施例について説明する。
10 プラズマ空間
34 プラズマガス供給ノズル
80、81、82 プラズマ発生部
83 電極
90 筐体
95 ファラデーシールド
97 スリット
120 制御部
130 操作スイッチ
140 放電検出器
150 異常報知手段
Claims (18)
- 所定の出力を有する第1の高周波電力を電極に供給してプラズマを発生させ、被処理体にプラズマ処理を行うプラズマ処理装置の運転方法であって、
前記プラズマ処理装置の前回の運転終了からの時間間隔が所定間隔を超えたときに、前記所定の出力よりも小さい出力を有する第2の高周波電力を前記電極に間欠的に複数回供給する電荷蓄積工程を行ってから前記プラズマ処理を行うプラズマ処理装置の運転方法。 - 前記電荷蓄積工程は、プラズマが発生したら終了する請求項1に記載のプラズマ処理装置の運転方法。
- 前記電荷蓄積工程は、直前に前記電極に供給した前記第2の高周波電力の出力よりも大きい出力を有する前記第2の高周波電力を前記電極に供給するシーケンスを含む請求項2に記載のプラズマ処理装置の運転方法。
- 前記シーケンスは、第1回目の高周波電力から、前記第2の高周波電力の出力が所定の蓄積用最大高周波電力に到達するまで行われる請求項3に記載のプラズマ処理装置の運転方法。
- 前記第2の高周波電力が前記所定の蓄積用最大高周波電力に到達した後は、前記所定の蓄積用最大高周波電力が前記電極に所定回数を最大限度として供給される請求項4に記載のプラズマ処理装置の運転方法。
- 前記所定の蓄積用最大高周波電力が前記電極に前記所定回数供給されてもプラズマが発生しなかったときには、異常アラームを出力する請求項5に記載のプラズマ処理装置の運転方法。
- 前記所定の蓄積用最大高周波電力は、前記第1の高周波電力の前記所定の出力の半分以下である請求項5又は6に記載のプラズマ処理装置の運転方法。
- 前記所定間隔は、30分〜2時間の範囲内である請求項1乃至7のいずれか一項に記載のプラズマ処理装置の運転方法。
- 前記電荷蓄積工程を、前記プラズマ処理よりもプラズマが発生し易い条件に設定して行う請求項1乃至8のいずれか一項に記載のプラズマ処理装置の運転方法。
- 前記プラズマが発生し易い条件は、前記プラズマ処理を行う圧力よりも低圧である請求項9に記載のプラズマ処理装置の運転方法。
- 前記プラズマが発生し易い条件は、前記プラズマ処理に用いるプラズマガスよりもプラズマが発生し易いプラズマガスを用いる請求項9又は10に記載のプラズマ処理装置の運転方法。
- 被処理体をプラズマ処理するための処理室と、
該処理室内にプラズマガスを供給するプラズマガス供給手段と、
前記プラズマガスからプラズマを生成するために前記処理室内に導入する電界及び/又は磁界を発生させるための電極と、
該電極に高周波電力を可変で供給可能である高周波電源と、
前記処理室内での前回の前記プラズマ処理の終了時からの経過時間を計測する時間計測手段と、
前記プラズマ処理を開始させるための操作スイッチと、
該操作スイッチが操作され、前記プラズマ処理を開始するときに、前記時間計測手段により計測された前記経過時間が所定の時間間隔より短いときには、前記高周波電源の前記高周波電力を所定の処理用高周波電力に設定して前記プラズマ処理を直ちに行い、前記経過時間が前記所定の時間間隔より長いときには、前記高周波電源の前記高周波電力を前記所定の処理用高周波電力よりも小さい電荷蓄積用高周波電力を間欠的に複数回前記電極に供給する電荷蓄積制御を行った後に前記プラズマ処理を行う制御手段と、を有するプラズマ処理装置。 - 前記制御手段は、前記電荷蓄積用高周波電力を前記電極に供給してプラズマが発生したときには、前記電荷蓄積制御を終了させる制御を行う請求項12に記載のプラズマ処理装置。
- 前記制御手段は、直前に前記電極に供給した前記電荷蓄積用高周波電力よりも大きい前記電荷蓄積用高周波電力を前記電極に供給するシーケンスを実行する請求項13に記載のプラズマ処理装置。
- 前記制御手段は、前記シーケンスを、第1回目の前記電荷蓄積用高周波電力から、前記電荷蓄積用高周波電力が所定の電荷蓄積用最大高周波電力に到達するまで行う請求項14に記載のプラズマ処理装置。
- 前記制御手段は、前記電荷蓄積制御を、前記プラズマ処理よりもプラズマが発生し易い条件に設定して行う請求項15に記載のプラズマ処理装置。
- 前記処理室内の圧力を変化させる圧力可変手段を更に備え、
前記制御手段は、前記圧力可変手段による設定圧力を、前記プラズマ処理を行う圧力よりも低い圧力に制御する請求項16に記載のプラズマ処理装置。 - 前記制御手段は、前記プラズマガス供給手段から、前記プラズマ処理に用いるプラズマガスよりもプラズマが発生し易いプラズマガスを前記処理室に供給させる請求項16又は17に記載のプラズマ処理装置。
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