JP2008112965A - 均一なエッチング速度分布の陰極を備えたマスクエッチングプラズマリアクタ - Google Patents
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
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- H01J37/32—Gas-filled discharge tubes
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- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68742—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a lifting arrangement, e.g. lift pins
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68757—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a coating or a hardness or a material
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- H—ELECTRICITY
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68785—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the mechanical construction of the susceptor, stage or support
Abstract
【解決手段】天井と側壁とを有する真空チャンバと、チャンバ内にワークを支持するための表面を有する陰極を含むワーク支持土台とを備え、表面が複数の各自領域を含み、表面の各自領域はそれぞれ異なる電気的特性の各自材料から形成されている。領域はウェハ支持土台の対称軸に対して同心円状に配置可能である。
【選択図】図1
Description
我々は、マスクエッチング処理における不均一なエッチング速度分布の原因の1つが、当該マスクエッチング処理が行なわれるプラズマリアクタ中のマスクを保持する支持土台あるいは陰極におけるRF電気の不均一の存在にあることを見出した。RFバイアス電力は、マスク表面のプラズマイオンエネルギを制御するために土台に加えられるのに対して、RFソース電力は、プラズマイオンを生成するために、例えば、上部コイルアンテナに加えられる。RFバイアス電力は、イオンエネルギに影響を与えるマスク表面の電界を制御する。マスク表面のイオンエネルギは、エッチング速度に影響を与えるために、土台におけるRF電気の不均一は、マスク表面全体に亘るエッチング速度の分布における不均一を招く。我々は、土台におけるRF不均一の原因のいくつかを見出した。1つは、アルミニウム土台(陰極)とアルミニウム表面板(facilities plate)とを螺合するチタンねじである。上記のねじは、土台の表面全体に亘って(つまり、マスク表面全体に亘って)電界パターンにおけるノードを形成する。なぜなら、上記ねじの電気的特性は、アルミニウム陰極のそれとは異なるからである。もう1つは、陰極と表面版との導電率の不均一な分布である。表面板と陰極との電気伝導は、主として表面板と陰極の周縁に限定される。これは、少なくとも部分的にはプラズマ処理中の真空圧力による陰極のそりに起因する。この周縁の伝導は、チタンねじの不均一な締め付け及び/又は表面板又は土台の周縁付近の表面仕上げの変化等、数多くの要因により不均一となることがある。我々は、土台全体に亘ってRF電気の均一性を向上するいくつかの特徴を導入することにより、この問題を解決した。第一に、アルミニウム陰極にチタンねじが存在することによるRF電界の不均一又は不連続性を、すべてのチタンねじの頭を被包する連続したチタンリングを陰極の上面周縁に延伸するように配することによって解決しようとするものである。表面の不均一又はチタンねじの不均一な締め付けによる導電率の変化を、高導電性ニッケルメッキを表面板と陰極の対向する表面周縁に施すこと、及び表面板と陰極との間に両者によりその周縁で圧縮されるRFガスケットの導入によって解決しようとするものである。
マスク上のエッチング深さ又は微小寸法を測定するためのエッチング処理の周期的中断による製造コストの上昇は、陰極44及びマスク又は基板18の裏面を介した光学的検出を用いることで抑制又は解消される。フォトレジストに対する低いエッチング選択性により、こうした周期的測定を行なうためにエッチング処理を中断することが必要であった。一般に、マスク材料は、フォトレジストよりも遅い速度でエッチングされる。この問題は、マスク上にフォトレジストの厚い層を蒸着することにより解決が図られるが、レジストの高いエッチング速度により、フォトレジスト表面には不規則な凹凸又は粗面ができる。この凹凸は、フォトレジストを通過する光に影響を与え、その結果、いかなる微小寸法やエッチング深さの光学的測定にもノイズを与えてしまう。そのために、フォトレジストは、ノイズのない光学的測定を確保するために周期的測定ごとに一時的に除去されるので、中断されたマスクエッチング処理を再開する前には、フォトレジストの再蒸着やレチクルパターンのフォトレジストへの再書き込みが必要となる。
図22A及び図22Bは、マスクの石英材料中にレチクルパターンをエッチングする処理を示している。図22Aにおいて、石英マスク基板210は、間隔を空けた線214及びフォトレジスト層212中に定められた開口216による周期的構造を有するフォトレジスト層212によって覆われている。図15及び図16のリアクタにおいては、CHF3+CF4+Arの石英エッチング処理ガスがチャンバ10内に導入され、電力がRF発生器24、26、48により加えられ、また、石英材料は、フォトレジスト層212中に形成された開口216の中でエッチングされる。石英中のエッチング深さは、石英基板210のエッチングされた上面から反射された光218とエッチングされていない上面から反射された光219との干渉により連続的に測定される。エッチング処理は、所望のエッチング深さに達すると即時に中断される(図22A)。そして、所望のマスクを形成するためにフォトレジストが除去される(図22B)。
図25及び図26は、図1のウェハ支持土台16の一実施形態を示し、ここでは、マトリクス状の裏面エッチング深さ検出素子(レンズ及び光ファイバ)が陰極44の上面に設けられており、それによりエッチング処理中のマスク又は基板の全表面に亘るエッチング速度分布又はエッチング深さ分布の瞬間的画像又はサンプルが、エッチング処理を中断することなくまたマスク基板を乱すことなく、連続的に得ることができる。アルミニウム平坦部44aは、その上面にマトリクス状の開口320を有し、各開口は、マスク基板300の裏面に対向するレンズ322を保持している。光源324は、各々レンズ322と接続された出力光ファイバ326を介して光を供給する。レンズ322は、干渉縞を解像するのに充分なフォーカシングを与える。干渉検出器328は、干渉縞の計数を容易にするセンサ又は分光計でもよく、各々レンズ322と接続された入力光ファイバ330と接続されている。スイッチ又はマルチプレクサ332は、各入力光ファイバ330から検出器328へ光が順に入るようにする。図25及び図26の装置が動作するモードには、3種類のモードがある。第1のモードでは、所定の1つのレンズ322の視野中のエッチング深さが干渉縞の間隔から演算される。第2のモードでは、検出器328は、分光計であり、所定の1つのレンズ322の視野中のエッチング深さが、多数の波長の干渉スペクトルでの低波長ピーク間隔(図13に対応)から演算される。第3のモードでは、多数の波長の干渉スペクトルが一定の時間に検出され、対応するエッチング深さが分かっているスペクトラムのライブラリ340と比較される。エッチング速度分布は、エッチング深さと経過時間から演算される。この分布は、処理のエッチング不均一を記録し、処理コントローラ132に送られる。コントローラ132は、リアクタの調整可能な特性を調整することによって応答し、エッチング速度分布の不均一性を減少することができる。
Claims (20)
- ワークを処理するプラズマリアクタであって、
天井と側壁とを有する真空チャンバと、
前記チャンバ内にワークを支持するための表面を有する陰極を含むワーク支持土台とを備え、前記陰極が異なる電気的特性の複数の各自領域を備えるリアクタ。 - 前記領域が前記ウェハ支持土台の対称軸に対して同心円状に配置されている請求項1記載の装置。
- 前記各自領域が前記陰極の前記表面上において異なる電気的特性の各自材料から形成されており、前記領域が内側領域と環状の外側領域とを含み、前記内側領域の材料が導体を含み、前記外側領域の材料が絶縁体を含む請求項2記載の装置。
- 前記各自材料が異なる電気的誘電率の絶縁材料を含む請求項2記載の装置。
- 前記陰極が上面を有するアルミニウム部材を備え、前記表面の前記複数の各自領域が各自材料から形成された各自のインサートを含む請求項1記載の装置。
- 前記各自のインサートが同心円状である請求項5記載の装置。
- 前記各自のインサートが導電性材料から形成された第1インサートと、非導電性材料から形成された第2インサートを含む請求項5記載の装置。
- 前記各自のインサートが異なる電気的誘電率の各自材料を含む請求項5記載の装置。
- 前記第1インサートが円盤状の中央インサートを含み、前記第2インサートが環状の外側インサートを含む請求項7記載の装置。
- 前記陰極が第1金属から形成され、
前記第1金属から形成された表面板を備え、前記陰極が下面を有し、前記表面板が前記陰極の下面に面した上面を有し、
前記第1金属より高い強度と異なる電気的特性を有する第2金属から形成され、前記陰極と前記表面板とを前記陰極と表面板の周縁に沿って連結するための複数の細長い固締具と、
前記陰極と前記表面板との間の、前記第2金属から形成され前記陰極と表面板の周縁に位置された薄いリング層と、
前記陰極の前記下面の周縁上の第3金属のコーティングと、前記表面板の前記上面の周縁上の前記第3金属のコーティングとを更に備え、前記第3金属の導電性が前記第1金属の導電性より高い請求項1記載の装置。 - 前記陰極が、
その内部に形成された中空空間と、
前記中空空間内に在り、前記各自領域の1つに対応する可動式金属要素と、
前記金属要素と前記支持面との間の距離を制御するための機構とを備える請求項1記載の装置。 - 前記中空空間が、前記支持面にカバー層を更に備え前記中空空間をシールする前記陰極内を延びる孔を含む請求項11記載の装置。
- 前記カバー層が絶縁材料を含む請求項12記載の装置。
- 前記陰極が円盤体と前記メイン表面から前記天井に向かって延びる角形平坦部とを備え、前記支持面が前記天井に面する前記平坦部の表面を含み、前記中空空間が少なくとも部分的に前記平坦部内に延びている請求項11記載の装置。
- 前記角形平坦部が角形マスクを支持するように適合されている請求項14記載の装置。
- 前記支持表面が複数の各自領域を含み、前記表面の前記各自領域が異なる電気的特性の各自材料から形成されている請求項11記載の装置。
- 前記表面の前記各自領域が前記ウェハ支持土台の対称軸に対して同心円状に配置されている請求項16記載の装置。
- 前記表面の前記各自領域が内側領域と環状の外側領域とを含み、前記内側領域の材料が導体を含み、前記外側領域の材料が絶縁体を含む請求項17記載の装置。
- 前記各自材料が異なる電気的誘電率の絶縁材料を含む請求項16記載の装置。
- 前記陰極が上面を有するアルミニウム部材を備え、前記表面の前記複数の各自領域が各自材料から形成された各自のインサートを含む請求項16記載の装置。
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US11/589,337 US8002946B2 (en) | 2006-10-30 | 2006-10-30 | Mask etch plasma reactor with cathode providing a uniform distribution of etch rate |
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EP (1) | EP1918978A3 (ja) |
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KR (1) | KR101343948B1 (ja) |
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Cited By (2)
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JP2014017359A (ja) * | 2012-07-09 | 2014-01-30 | Tokyo Electron Ltd | 終点検出方法、プログラム及び基板処理装置 |
KR101585624B1 (ko) | 2009-01-13 | 2016-01-14 | 주식회사 나노텍 | 다채널 감지 신호의 시분할 처리가 가능한 공정 이상 모니터링 장치 |
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JP2004363552A (ja) * | 2003-02-03 | 2004-12-24 | Okutekku:Kk | プラズマ処理装置及びプラズマ処理装置用の電極板及び電極板製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101585624B1 (ko) | 2009-01-13 | 2016-01-14 | 주식회사 나노텍 | 다채널 감지 신호의 시분할 처리가 가능한 공정 이상 모니터링 장치 |
JP2014017359A (ja) * | 2012-07-09 | 2014-01-30 | Tokyo Electron Ltd | 終点検出方法、プログラム及び基板処理装置 |
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TWI375990B (en) | 2012-11-01 |
CN101174096B (zh) | 2012-12-19 |
CN101174096A (zh) | 2008-05-07 |
US20080100222A1 (en) | 2008-05-01 |
TW200822213A (en) | 2008-05-16 |
KR101343948B1 (ko) | 2013-12-20 |
EP1918978A3 (en) | 2010-06-23 |
EP1918978A2 (en) | 2008-05-07 |
KR20080039198A (ko) | 2008-05-07 |
US8002946B2 (en) | 2011-08-23 |
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