JP6362488B2 - プラズマ処理装置及びプラズマ処理方法 - Google Patents
プラズマ処理装置及びプラズマ処理方法 Download PDFInfo
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Description
該処理容器内に設けられ、基板を上面に載置可能な回転テーブルと、
該回転テーブルの周方向における所定箇所に設けられ、第1のプラズマガスから第1のプラズマを発生させて第1のプラズマ処理を行う第1のプラズマ処理領域と、
該第1のプラズマ処理領域と前記周方向において離間して設けられ、第2のプラズマガスから第2のプラズマを発生させて第2のプラズマ処理を行う第2のプラズマ処理領域と、
前記周方向において前記第1のプラズマ処理領域と前記第2のプラズマ処理領域との間の2つの間隔領域の各々に設けられ、前記第1のプラズマ処理領域と前記第2のプラズマ処理領域とを分離して前記第1のプラズマガスと前記第2のプラズマガスとの混合を防止する2つの分離領域と、を有し、
前記第1のプラズマ処理領域はエッチング処理を行う領域であり、
前記第2のプラズマ処理領域は該エッチング処理後の改質処理を行う領域である。
前記第1のプラズマ処理が行われた前記基板をパージガスによりパージする工程と、
第2のプラズマガスから第2のプラズマを発生させて前記パージされた前記基板に第2のプラズマ処理を行う工程と、
前記第2のプラズマ処理が行われた前記基板を前記パージガスによりパージする工程と、からなるサイクルを同一周期で複数回繰り返すことにより、前記基板に2種類のプラズマ処理を交互に行うプラズマ処理方法であって、
前記第1のプラズマ処理はエッチング処理であり、
前記第2のプラズマ処理は該エッチング処理後の改質処理である。
ここで、H2ガスとNF3ガスが所定の濃度範囲内にあると爆発を起こすおそれがあるのは上述の通りであるが、爆発を起こさない場合であっても、反応の結果HFを発生する。HFは、腐食性のガスであるから、HFが発生して処理容器1の内壁等に付着すると、付着した内壁等を腐食させるおそれがある。よって、たとえ爆発が生じない場合であっても、NF3ガスとH2ガスとは混合しない構造をとることが好ましい。この点、本実施形態に係るプラズマ処理装置は、第1のプラズマ処理領域P2と第2のプラズマ処理領域P2とを凸状部4と分離ガス(Arガス)の供給で分離する分離領域Dを備えているので、爆発や処理容器1の内部の腐食を確実に防止することができる。
図11(b)で説明したように、回転テーブル2は、例えば、比較的遅い20rpmの回転速度で回転しているとしても、1回転するのに3秒であるから、3秒未満の時間で第2のプラズマ処理領域P2をウエハWは通過する。よって、3秒未満の短時間の改質処理が膜160に対してなされる。より正確には、第2のプラズマ処理領域P2も、多くても回転テーブル2の全体の1/4未満の面積しか無いので、0.75秒未満の短時間の改質処理が行われる。なお、改質工程では、膜161の中にフッ素成分が消滅又は低減するので、図11(a)の状態と同様の状態に膜161が戻り、この膜質回復状態を、図11(a)と同様に膜160とする。
2 回転テーブル
24 凹部
31、32 プラズマガスノズル
41、42 分離ガスノズル
80、130 プラズマ発生器
90、140 筐体
P1、P2 プラズマ処理領域
D 分離領域
Claims (16)
- 処理容器と、
該処理容器内に設けられ、基板を上面に載置可能な回転テーブルと、
該回転テーブルの周方向における所定箇所に設けられ、第1のプラズマガスから第1のプラズマを発生させて第1のプラズマ処理を行う第1のプラズマ処理領域と、
該第1のプラズマ処理領域と前記周方向において離間して設けられ、第2のプラズマガスから第2のプラズマを発生させて第2のプラズマ処理を行う第2のプラズマ処理領域と、
前記周方向において前記第1のプラズマ処理領域と前記第2のプラズマ処理領域との間の2つの間隔領域の各々に設けられ、前記第1のプラズマ処理領域と前記第2のプラズマ処理領域とを分離して前記第1のプラズマガスと前記第2のプラズマガスとの混合を防止する2つの分離領域と、を有し、
前記第1のプラズマ処理領域はエッチング処理を行う領域であり、
前記第2のプラズマ処理領域は該エッチング処理後の改質処理を行う領域であるプラズマ処理装置。 - 前記第1のプラズマ処理領域には、前記第1のプラズマガスを供給する第1のプラズマガスノズルが設けられ、
前記第2のプラズマ処理領域には、前記第2のプラズマガスを供給する第2のプラズマガスノズルが設けられ、
前記分離領域には、分離ガスを供給する分離ガスノズルが設けられた請求項1に記載のプラズマ処理装置。 - 前記第1のプラズマ処理領域及び前記第2のプラズマ処理領域は、前記処理容器の天井面から前記回転テーブルに向かって突出し、前記第1のプラズマ及び前記第2のプラズマの流出を防ぐ側壁を各々有する請求項2に記載のプラズマ処理装置。
- 前記分離領域は、前記処理容器の天井面から前記回転テーブルに向かって突出して下面と前記回転テーブルの上面との間に狭い空間を形成する凸状部と、前記下面よりも高い面を有して前記分離ガスノズルを収容する溝とを有し、
前記分離ガスノズルからの前記分離ガスの供給により、前記第1のプラズマガスと前記第2のプラズマガスとの混合を防ぐ請求項2又は3に記載のプラズマ処理装置。 - 前記第1のプラズマ処理領域には、前記第1のプラズマガスとしてフッ素含有ガスが供給され、
前記第2のプラズマ処理領域には、前記第2のプラズマガスとして水素ガス含有ガスが供給され、
前記分離領域には、前記分離ガスとして希ガス又は窒素ガスが供給される請求項2乃至4のいずれか一項に記載のプラズマ処理装置。 - 前記分離領域で前記周方向に区画された2つの領域は、前記処理容器の底面に各々排気口を有する請求項1乃至5のいずれか一項に記載のプラズマ処理装置。
- 前記排気口は、前記第1のプラズマ処理領域及び前記第2のプラズマ処理領域の前記回転テーブルの回転方向下流側端部にそれぞれ設けられた請求項6に記載のプラズマ処理装置。
- 前記回転テーブルは、前記上面に載置された前記基板を前記第1のプラズマ処理領域、前記分離領域、前記第2のプラズマ処理領域、前記分離領域の順で通過させる方向に回転可能な請求項1乃至7のいずれか一項に記載のプラズマ処理装置。
- 第1のプラズマガスから第1のプラズマを発生させて基板に第1のプラズマ処理を行う工程と、
前記第1のプラズマ処理が行われた前記基板をパージガスによりパージする工程と、
第2のプラズマガスから第2のプラズマを発生させて前記パージされた前記基板に第2のプラズマ処理を行う工程と、
前記第2のプラズマ処理が行われた前記基板を前記パージガスによりパージする工程と、からなるサイクルを同一周期で複数回繰り返すことにより、前記基板に2種類のプラズマ処理を交互に行うプラズマ処理方法であって、
前記第1のプラズマ処理はエッチング処理であり、
前記第2のプラズマ処理は該エッチング処理後の改質処理であるプラズマ処理方法。 - 前記基板の表面上には膜が成膜されており、
前記エッチング処理は該膜をエッチングする処理であり、
前記改質処理は前記エッチング処理が行われた該膜を改質する処理である請求項9に記載のプラズマ処理方法。 - 前記エッチング処理は、前記膜を分子層レベルでエッチングする微量の処理であり、
前記改質処理は、エッチング処理された前記膜の表面を分子層レベルで改質する微量の処理である請求項10に記載のプラズマ処理方法。 - 前記第1のプラズマガスはフッ素含有ガスであり、
前記第2のプラズマガスは水素含有ガスであり、
前記パージガスは希ガス又は窒素ガスである請求項9乃至11のいずれか一項に記載のプラズマ処理方法。 - 前記サイクルに要する時間は0秒より大きく30秒以下である請求項9乃至12のいずれか一項に記載のプラズマ処理方法。
- 前記サイクルに要する時間は0.25秒以上12秒以下である請求項13に記載のプラズマ処理方法。
- 処理容器内に設けられた回転テーブル上に該回転テーブルの周方向に沿って複数の基板を載置し、前記処理容器内に前記回転テーブルの回転方向に沿って前記第1のプラズマ処理を行う第1のプラズマ処理領域、前記第1のプラズマ処理が行われた基板を前記パージガスによりパージするパージ領域、前記第2のプラズマ処理を行う第2のプラズマ処理領域、前記第2のプラズマ処理が行われた基板を前記パージガスによりパージする前記パージ領域を順に配置し、前記回転テーブルを所定速度で回転させることにより前記サイクルを前記同一周期で複数回繰り返す請求項9乃至14のいずれか一項に記載のプラズマ処理方法。
- 前記第1のプラズマ処理領域と前記第2のプラズマ処理領域は、前記パージ領域により分離され、
前記第1のプラズマ処理が行われた基板を前記パージガスによりパージする工程により前記第1のプラズマ処理を行う工程中における前記第2のプラズマガスの混入を防止し、
前記第2のプラズマ処理が行われた基板を前記パージガスによりパージする工程により前記第2のプラズマ処理を行う工程中における前記第1のプラズマガスの混入を防止する請求項15に記載のプラズマ処理方法。
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