JP2022122437A - 基板支持器、プラズマ処理システム及びプラズマエッチング方法 - Google Patents
基板支持器、プラズマ処理システム及びプラズマエッチング方法 Download PDFInfo
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Abstract
【解決手段】プラズマ処理装置で使用する基板支持器は、基台と、前記基台上に配置され、基板支持領域と、前記基板支持領域を囲むリング支持領域とを有するセラミックプレートと、前記基台及び前記セラミックプレートの周囲に配置された絶縁環状部材と、内側部分及び外側部分を有する固定エッジリングであり、前記内側部分は、前記リング支持領域上に支持され、前記外側部分は、前記絶縁環状部材上に支持され、前記外側部分は、第1の幅を有する、固定エッジリングと、前記固定エッジリングの前記外側部分の上方に配置され、前記第1の幅より小さい第2の幅を有する可動エッジリングと、前記固定エッジリングに対して前記可動エッジリングを上下方向に移動させるように構成されるアクチュエータと、を備える。
【選択図】図4
Description
先ず、一実施形態にかかるプラズマ処理システムについて説明する。図1は、プラズマ処理システムの構成の概略を示す説明図である。
以下に、プラズマ処理装置1の一例としてのマイクロ波を用いたプラズマ処理装置の構成例について説明する。図2は、プラズマ処理装置1の構成の概略を示す縦断面図である。
以下に、上述した基板支持器11の構成例について説明する。図3は、基板支持器11の構成の概略を示す斜視断面図である。図4は、基板支持器11の一部構成の概略を示す縦断面図である。
図5に示すように可動エッジリング120の下面には、凹部120aが形成される。リフターピン121の上面121aは平坦であり、凹部120aに挿入されて可動エッジリング120を支持する。すなわち、リフターピン121は、その上面121aで可動エッジリング120を支持するために凹部120a内に挿入される。可動エッジリング120の幅(第2の幅)Aは、固定エッジリング110の外周部110bの幅Wより小さく、例えば20mm~40mmである。このように可動エッジリング120の幅Aを小さくして、プラズマに曝される面積を小さくすることで、プラズマ処理への影響を抑えることができる。また、可動エッジリング120の厚みBは、例えば2mm~10mmである。可動エッジリング120の消耗を抑制するため、厚みBは4mm以上がより好ましい。
ここで、図4に示すようにRF電流が通過するRF経路(図4中の「PF Pass」矢印)は、基台100の外側面と絶縁環状部材102の内側面の間の経路と、基台100の上面とセラミックプレート101の下面の間の経路と、基台100の上面から固定エッジリング110を通って上方に向かう経路とを含む。そして、例えばRF経路の径方向内側で可動エッジリング及びリフターピンを上下動させると、基板Wの中心部におけるER及びCDが変動する場合がある。ERは、プラズマ処理がエッチングである場合のエッチングレート(Etching Rate)である。CDは、基板Wのパターンの線幅(Critical Dimension)である。また、RF経路の径方向内側で可動エッジリング及びリフターピンを上下動させると、RF経路に近い位置で上下動が生じるので、異常放電が起きる場合もある。
移動機構122による可動エッジリング120の移動量Dは、例えば0mm~40mmである。このように可動エッジリング120の移動量Dを大きくできるのは、上述したように可動エッジリング120とリフターピン121の支持構造がシンプルであり、且つ、可動エッジリング120を径方向外側に配置したためである。なお、移動量Dが0mmは、図4の点線で示すように可動エッジリング120が固定エッジリング110の上面に載っている状態である。
次に、以上のように構成されたプラズマ処理システムを用いたプラズマ処理方法(プラズマエッチング方法)について説明する。本実施形態では、基板Wをエッチングする、いわゆるシリコンエッチングを行う場合について説明する。
2 制御部
10 プラズマ処理チャンバ
11 基板支持器
20 マイクロ波供給部
30 ガス供給部
100 基台
101 セラミックプレート
101a 基板支持領域
101b リング支持領域
102 絶縁環状部材
110 固定エッジリング
110a 内周部
110b 外周部
120 可動エッジリング
121 リフターピン
122 移動機構
W 基板
Claims (10)
- プラズマ処理装置で使用する基板支持器であって、
基台と、
前記基台上に配置され、基板支持領域と、前記基板支持領域を囲むリング支持領域とを有するセラミックプレートと、
前記基台及び前記セラミックプレートの周囲に配置された絶縁環状部材と、
内側部分及び外側部分を有する固定エッジリングであり、前記内側部分は、前記リング支持領域上に支持され、前記外側部分は、前記絶縁環状部材上に支持され、前記外側部分は、第1の幅を有する、固定エッジリングと、
前記固定エッジリングの前記外側部分の上方に配置され、前記第1の幅より小さい第2の幅を有する可動エッジリングと、
前記固定エッジリングに対して前記可動エッジリングを上下方向に移動させるように構成されるアクチュエータと、を備える、基板支持器。 - 前記アクチュエータによる前記可動エッジリングの移動量は0mm~40mmである、請求項1に記載の基板支持器。
- 前記第2の幅は20mm~40mmである、請求項1又は2に記載の基板支持器。
- 前記可動エッジリングの厚みは2mm~10mmである、請求項1~3のいずれか一項に記載の基板支持器。
- 前記固定エッジリングと前記可動エッジリングはそれぞれ石英で作製される、請求項1~4のいずれか一項に記載の基板支持器。
- 前記可動エッジリングを支持するように構成されるリフターピンを備え、
前記リフターピンは石英で作製される、請求項5に記載の基板支持器。 - 前記可動エッジリングは、下面に凹部を有し、
前記リフターピンは、その上面で前記可動エッジリングを支持するために前記凹部内に挿入される、請求項6に記載の基板支持器。 - 前記リフターピンの上面は平坦である、請求項7に記載の基板支持器。
- プラズマ処理装置及び制御部を備え、
前記プラズマ処理装置は、
プラズマ処理チャンバと、
前記プラズマ処理チャンバ内に配置される基板支持器と、
前記プラズマ処理チャンバに処理ガスを供給するように構成されるガス供給部と、
前記処理ガスからプラズマを生成するように構成されるプラズマ生成部と、を備え、
前記基板支持器は、
基台と、
前記基台上に配置され、基板支持領域と、前記基板支持領域を囲むリング支持領域とを有するセラミックプレートと、
前記基台及び前記セラミックプレートの周囲に配置された絶縁環状部材と、
内側部分及び外側部分を有する固定エッジリングであり、前記内側部分は、前記リング支持領域上に支持され、前記外側部分は、前記絶縁環状部材上に支持され、前記外側部分は、第1の幅を有する、固定エッジリングと、
前記固定エッジリングの前記外側部分の上方に配置され、前記第1の幅より小さい第2の幅を有する可動エッジリングと、
前記可動エッジリングを支持するように構成されるリフターピンと、
前記リフターピンを介して前記固定エッジリングに対して前記可動エッジリングを上下方向に移動させるように構成されるアクチュエータと、を備え、
前記固定エッジリング、前記可動エッジリング及び前記リフターピンはそれぞれ絶縁材料で作製され、
前記制御部は、
前記基板支持器にシリコン層を含む基板を配置する工程と、
前記プラズマ処理チャンバに前記処理ガスを供給する工程と、
前記処理ガスから前記プラズマを生成する工程と、
前記基板を前記プラズマに曝して、前記シリコン層をエッチングする工程と、
前記リフターピンを介して前記可動エッジリングを上下方向に移動させる工程と、を実行するように、前記プラズマ処理装置を制御するように構成される、プラズマ処理システム。 - 基板支持器に支持された基板に含まれるシリコン層のプラズマエッチング方法であって、
前記基板支持器は、
基台と、
前記基台上に配置され、基板支持領域と、前記基板支持領域を囲むリング支持領域とを有するセラミックプレートと、
前記基台及び前記セラミックプレートの周囲に配置された絶縁環状部材と、
内側部分及び外側部分を有する固定エッジリングであり、前記内側部分は、前記リング支持領域上に支持され、前記外側部分は、前記絶縁環状部材上に支持され、前記外側部分は、第1の幅を有する、固定エッジリングと、
前記固定エッジリングの前記外側部分の上方に配置され、前記第1の幅より小さい第2の幅を有する可動エッジリングと、
前記可動エッジリングを支持するように構成されるリフターピンと、
前記リフターピンを介して前記固定エッジリングに対して前記可動エッジリングを上下方向に移動させるように構成されるアクチュエータと、を備え、
前記固定エッジリング、前記可動エッジリング及び前記リフターピンはそれぞれ絶縁材料で作製され、
前記プラズマエッチング方法は、
前記基板支持器にシリコン層を含む基板を配置する工程と、
プラズマ処理チャンバに処理ガスを供給する工程と、
前記処理ガスからプラズマを生成する工程と、
前記基板を前記プラズマに曝して、前シリコン層をエッチングする工程と、
前記リフターピンを介して前記可動エッジリングを上下方向に移動させる工程と、を含む、プラズマエッチング方法。
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