JP2019165078A - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
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Abstract
Description
前記基板上への酸化膜の成膜が終了したら、前記プラズマ処理領域内をプラズマが着火し易い状態にする着火準備工程と、を有する。
図1は、本発明の実施形態に係る成膜装置の一例の概略縦断面図を示す。また、図2に、本実施形態に係る成膜装置の一例の概略平面図を示す。なお、図2では、説明の便宜上、天板11の描画を省略している。
以下、このような本発明の実施形態に係る成膜装置を用いた成膜方法について説明する。なお、本実施形態に係る成膜方法で成膜可能な薄膜は、シリコン酸化膜(SiO2)の他、TiO2、ZrO2、HfO2等の金属酸化膜も含まれるが、本実施形態では、説明の容易のため、原料ガスとしてシリコン含有ガスを用いた例を挙げて説明する。酸化ガスは、上述のように、酸素、オゾン、水、過酸化水素等を用いることができるが、本実施形態では、オゾンを用いた例について説明する。また、プラズマ処理ガスとしては、改質のときには酸素を含有するガス、改質を終了する際には水素原子を含有するガスであれば、種々のガスを用いることができるが、本実施形態においては、アルゴン、酸素、水素の混合ガスをプラズマ処理ガスとして用いた例について説明する。また、分離ガスは、窒素等の不活性ガス、又はヘリウム、アルゴン等の希ガスを用いることができるが、本実施形態では、アルゴンを用いた例について説明する。
次に、本実施形態に係る成膜方法を実施した実施例について説明する。
2 回転テーブル
24 凹部
31、32 処理ガスノズル
33〜35 プラズマ処理ガスノズル
36 ガス吐出孔
41、42 分離ガスノズル
80 プラズマ源
83 アンテナ
85 高周波電源
95 ファラデーシールド
120 制御部
130〜133 流量制御器
140〜143 ガス供給源
P1 第1の処理領域(原料ガス吸着領域)
P2 第2の処理領域(酸化領域)
P3 第3の処理領域(プラズマ処理領域)
Claims (12)
- 処理室内の所定のプラズマ処理領域でプラズマ源により生成された酸素ラジカルを用いて基板上に成膜された酸化膜を改質する改質工程と、
前記基板上への酸化膜の成膜が終了したら、前記プラズマ処理領域内をプラズマが着火し易い状態にする着火準備工程と、を有する成膜方法。 - 前記着火準備工程は、プラズマが生成した状態で、前記プラズマ処理領域内に酸素ガスの供給を停止して水素原子含有ガスを供給する工程である請求項1に記載の成膜方法。
- 前記水素原子含有ガスは、水素ガス及びアンモニアガスの少なくとも1つを含む請求項2に記載の成膜方法。
- 前記水素原子含有ガスは、アルゴンガスを更に含む混合ガスである請求項3に記載の成膜方法。
- 前記改質工程は、前記プラズマ処理領域内に供給されたアルゴンガス、水素ガス、酸素ガスを含むプラズマ処理ガスを前記プラズマ源により活性化することにより行われ、
前記着火準備工程は、前記プラズマ処理ガスのうち、前記酸素ガスの前記プラズマ処理領域内への供給を停止し、前記アルゴンガス及び前記水素ガスの供給を継続することにより行われる請求項4に記載の成膜方法。 - 前記改質工程の前に、
前記基板上に原料ガスを吸着させる吸着工程と、
前記基板上に吸着した前記原料ガスを酸化して前記酸化膜の分子層を堆積させる酸化工程と、を含む成膜工程を更に有する請求項1乃至5のいずれか一項に記載の成膜方法。 - 前記基板は回転テーブル上に周方向に沿って載置され、
前記回転テーブルの上方に、前記回転テーブルの回転方向に沿って原料ガス吸着領域、酸化領域、前記プラズマ処理領域が互いに離間して配置され、前記回転テーブルを前記回転方向に複数回回転させ、前記回転テーブル上の前記基板に前記原料ガス吸着領域、前記酸化領域、前記プラズマ処理領域を順に通過させることにより前記成膜工程及び前記改質工程を繰り返し、前記酸化膜の膜厚が所定の膜厚となったときに前記酸化膜の成膜を終了し、前記着火準備工程を行う請求項6に記載の成膜方法。 - 前記原料ガス吸着領域と前記酸化領域との間、及び前記プラズマ処理領域と前記原料ガス吸着領域との間に、前記基板上にパージガスを供給するパージガス供給領域が設けられ、前記吸着工程と前記酸化工程との間、及び前記改質工程と前記吸着工程との間に、パージ工程を更に有する請求項7に記載の成膜方法。
- 前記プラズマ処理領域は、天井面及び側壁に囲まれた領域であり、
前記プラズマ源は、前記天井面の上方の前記処理室外に設けられた誘導結合型プラズマ源である請求項1乃至8のいずれか一項に記載の成膜方法。 - 前記酸化膜は、シリコン酸化膜又は金属酸化膜である請求項1乃至9のいずれか一項に記載の成膜方法。
- 前記着火準備工程の後、前記酸化膜の成膜が終了した前記基板を前記処理室から搬出する基板搬出工程と、
新たな基板を前記処理室内に搬入する搬入工程と、
前記プラズマ処理領域でプラズマを着火させるプラズマ着火工程と、を更に有する請求項1乃至10のいずれか一項に記載の成膜方法。 - 処理室と、
処理室内に設けられ、周方向に沿って上面に基板を載置可能な回転テーブルと、
該回転テーブルに原料ガスを供給可能な原料ガス供給手段と、
前記回転テーブルの回転方向下流側に設けられ、前記回転テーブルに酸化ガスを供給可能な酸化ガス供給手段と、
前記回転テーブルの回転方向下流側に設けられ、前記回転テーブルにプラズマ処理ガスを供給可能なプラズマ処理ガス供給手段と、
該プラズマ処理ガス供給手段を上方及び側方から囲むプラズマ処理領域と、
該プラズマ処理領域内でプラズマを発生させるプラズマ源と、
前記回転テーブルを回転させながら前記原料ガス供給手段から原料ガス、前記酸化ガス供給手段から酸化ガスを供給して前記基板上に酸化膜を成膜する成膜工程と、前記プラズマ源を駆動して前記プラズマ処理ガス供給手段から酸素ガスを含むプラズマ処理ガスを供給して前記酸化膜を改質する改質工程とを交互に実施し、
前記成膜工程及び前記改質工程終了後に、前記原料ガス及び前記酸化ガスの供給を停止させるとともに、前記プラズマ源を駆動したまま前記プラズマ処理ガス供給手段から酸素ガスの供給を停止させ、水素原子含有ガスを供給させるプラズマ着火準備工程を実施する制御を行う制御手段と、を有する成膜装置。
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