JP2015225889A - プラズマ処理方法及び装置 - Google Patents
プラズマ処理方法及び装置 Download PDFInfo
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- 238000003379 elimination reaction Methods 0.000 claims description 4
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Abstract
【解決手段】処理室5内に設けられる冷却したステージ11に、基板2を保持した搬送キャリア4を載置する第1の工程と、ステージ11上に設けたカバー24とステージ11を相対的に移動させ、カバー24に形成した窓部25から基板2を露出させた状態で、搬送キャリア4の保持シート6とフレーム7とを覆う第2の工程と、搬送キャリア4に保持された基板2に対してプラズマ処理を行う第3の工程と、カバー24を冷却する第4の工程と、処理室5から基板2を保持した搬送キャリア4を搬出する第5の工程とを実行する。
【選択図】図1
Description
特に、排出前にステージへの搬送キャリアの静電吸着を停止すると、ステージによる搬送キャリアの冷却が十分に行われず、保持シートが熱ダメージを受けやすい。
環状のフレームと保持シートからなる搬送キャリアに保持された基板に対して、処理室内でプラズマ処理を施すプラズマ処理方法であって、
前記処理室内に設けられる冷却したステージに、基板を保持した搬送キャリアを載置する第1の工程と、
前記ステージ上に設けたカバーと前記ステージを相対的に移動させ、前記カバーに形成した窓部から基板を露出させた状態で、搬送キャリアの保持シートとフレームとを覆う第2の工程と、
前記搬送キャリアに保持された基板に対してプラズマ処理を行う第3の工程と、
前記カバーを冷却する第4の工程と、
前記処理室から基板を保持した搬送キャリアを搬出する第5の工程と、
を有するものである。
プラズマダイシング処理では、プロセスガス源12からチャンバ3内にプロセスガス(例えば、SF6)を導入しつつ、減圧機構14により排気し、処理室5を所定圧力(例えば、10Pa)に維持する。その後、アンテナ9に対して高周波電源部10Aから高周波電力(例えば、2000W)を供給してチャンバ3内にプラズマPを発生させ、カバー24の窓部25から露出しているウェハ2に照射する。このとき、ステージ11の電極部15には高周波電源部10Bからバイアス電圧(例えば、50W)を印加する。また、冷却装置20によりステージ11を冷却する(例えば、20℃)。ウェハ2の表面には、チップ領域を規定するレジストマスクが前工程において既に形成されている。レジストマスクが形成されたウェハ2に対して、プラズマ処理を行うと、ウェハ2の表面の、レジストマスクで保護されていない部分(ストリート)では、プラズマP中のラジカルとイオンの物理化学的作用によって、ウェハ2がエッチングされる。そして、ウェハ2の裏面に到達するまでエッチングを続けることにより、ウェハ2は個別のチップに分割される。
2…ウェハ(基板)
3…チャンバ
4…搬送キャリア
5…処理室
6…保持シート
7…フレーム
8…誘電体壁
9…アンテナ
10A,10B…高周波電源部
11…ステージ
12…プロセスガス源
13…アッシングガス源
14…減圧機構
15…電極部
15a…冷媒流路
15b…静電チャック
15c…電極部本体
16…基台部
17…外装部
18…載置面
19…突出ピン
20…冷却装置
21…冷媒循環装置
22a…静電吸着用電極
22b…高周波電極
23…直流電源
24…カバー
25…窓部
26…駆動ロッド
27…駆動機構
28…制御装置
Claims (10)
- 環状のフレームと保持シートからなる搬送キャリアに保持された基板に対して、処理室内でプラズマ処理を施すプラズマ処理方法であって、
前記処理室内に設けられる冷却したステージに、基板を保持した搬送キャリアを載置する第1の工程と、
前記ステージ上に設けたカバーと前記ステージを相対的に移動させ、前記カバーに形成した窓部から基板を露出させた状態で、搬送キャリアの保持シートとフレームとを覆う第2の工程と、
前記搬送キャリアに保持された基板に対してプラズマ処理を行う第3の工程と、
前記カバーを冷却する第4の工程と、
前記処理室から基板を保持した搬送キャリアを搬出する第5の工程と、
を有することを特徴とするプラズマ処理方法。 - 前記第3の工程では、ステージに搬送キャリアを静電吸着し、
前記第3の工程と、前記第5の工程の間で、ステージへの搬送キャリアの静電吸着を停止した後、搬送キャリアの帯電を除去するための除電処理を行うことを特徴とする請求項1に記載のプラズマ処理方法。 - 前記第4の工程は、前記第3の工程の終了後、所定時間待機するものであることを特徴とする請求項1又は2に記載のプラズマ処理方法。
- 前記第4の工程は、カバーに対して熱伝達ガスを供給するものであることを特徴とする請求項1又は2に記載のプラズマ処理方法。
- 前記第4の工程は、カバーとステージを前記第2の工程よりも離した状態で行うことを特徴とする請求項1から4のいずれか1項に記載のプラズマ処理方法。
- 環状のフレームと保持シートからなる搬送キャリアに保持された基板に対して、処理室内でプラズマ処理を施すプラズマ処理装置であって、
前記処理室内に設けられ、搬送キャリアが載置される冷却したステージと、
窓部を有し、前記ステージ上に設けられることにより、前記窓部から基板を露出させた状態で、搬送キャリアの保持シートとフレームとを覆うカバーと、
前記ステージと前記カバーとを相対的に接近及び離間可能とする駆動手段と、
前記搬送キャリアに保持した基板にプラズマ処理を施すプラズマ発生手段と、
前記搬送キャリアを搬入してステージ上に載置する搬入処理、前記駆動手段を駆動することによりステージ上に載置した搬送キャリアをカバーで覆い、前記プラズマ発生手段を駆動することによりプラズマを発生させるプラズマ処理、カバーを冷却するカバー冷却処理、及び、搬送キャリアを搬出させる搬出処理を実行する制御手段と、
を備えたことを特徴とするプラズマ処理装置。 - 除電プラズマを発生する除電手段を備え、
前記制御手段は、プラズマ処理と搬出処理の間に、ステージへの搬送キャリアの静電吸着を停止した後、搬送キャリアの帯電を除去するための除電処理を実行することを特徴とする請求項6に記載のプラズマ処理装置。 - 前記制御手段は、カバー冷却処理を、プラズマ処理後、所定時間待機させることにより行うことを特徴とする請求項6又は7に記載のプラズマ処理装置。
- 前記カバーに対して熱伝達ガスを供給するガス供給手段を備え、
前記制御手段は、カバー冷却処理を、前記ガス供給手段によりカバーに熱伝達ガスを供給することにより行うことを特徴とする請求項6又は7に記載のプラズマ処理装置。 - 前記制御手段は、プラズマ処理と搬出処理の間に、前記駆動手段を駆動してカバーとステージの距離を基板にプラズマ処理を施す際よりも離間させることを特徴とする請求項6から9のいずれか1項に記載のプラズマ処理装置。
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