JP5770740B2 - 高ドーズインプラントストリップの前に行われる、シリコンを保護するためのパッシベーションプロセスの改善方法およびそのための装置 - Google Patents
高ドーズインプラントストリップの前に行われる、シリコンを保護するためのパッシベーションプロセスの改善方法およびそのための装置 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- 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
- 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
- H01L21/30655—Plasma etching; Reactive-ion etching comprising alternated and repeated etching and passivation steps, e.g. Bosch process
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32357—Generation remote from the workpiece, e.g. down-stream
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Drying Of Semiconductors (AREA)
Description
本願は、米国特許法第119条(e)項に基づき、米国仮特許出願第61/285,918号(出願日:2009年12月11日)による恩恵を主張する。当該仮出願は、参照により本願に組み込まれる。
O2/NF3
O2/CF4
O2/N2
H2/CO2/NF3
H2/CO2/CF4
H2/CO2/NF3/CF4
H2/CO2
H2/N2
O2/FGと共に、フォーミングガスを約14−25体積%で供給
H2/CO2/FGと共に、フォーミングガスを約40−60体積%で供給
本発明ではさまざまな種類のプラズマ源を利用するとしてよい。例えば、RF、DCおよびマイクロ波を利用したプラズマ源を利用するとしてよい。好ましい実施形態によると、下流RFプラズマ源を利用する。通常は、300mmのウェハ用のRFプラズマ電力の範囲は、約300ワットから約10キロワットである。一部の実施形態によると、RFプラズマ電力は、約2000ワットと5000ワットとの間、例えば、3500Wである。
本発明のさまざまな実施形態によると、プラズマガスはシャワーヘッドアセンブリを介してワークピース表面に供給される。シャワーヘッドアセンブリは、接地されるか、または、電圧が印加され、ウェハへの中性種の流れに影響を与えることなく一部の荷電種を誘引するとしてよい。例えば、0ワットから1000ワットのバイアスを印加する。プラズマに含まれる荷電した種の多くは、シャワーヘッドで再結合する。シャワーヘッドアセンブリは、プラズマおよび不活性ガスの混合物を反応チャンバ内に方向付けるための穴が設けられている金属プレートであるシャワーヘッドを含む。シャワーヘッドは、プラズマ源から活性水素をより大きな領域に対して再度供給して、より小さいプラズマ源を利用できるようにする。シャワーヘッドの穴の数および配置は、ストリッピング速度およびストリッピング速度の均一性を最適化するように設定するとしてよい。プラズマ源がウェハ上方の中央に位置している場合、シャワーヘッドの穴は、活性ガスを外側領域に向かって押し出すべく、シャワーヘッドの中央ではより小さくてより少なくなっていることが好ましい。シャワーヘッドには、少なくとも100個の穴が設けられているとしてよい。適切なシャワーヘッドとしては、Novellus Systems,Inc社(米国カリフォルニア州サンノゼ)製のガンマxPRシャワーヘッドまたはGxTドロップインシャワーヘッドがある。シャワーヘッドアセンブリがない実施形態では、プラズマは直接処理チャンバに導入される。
処理チャンバは、ストリッピング処理を実行するために適切な反応チャンバであればどのような反応チャンバであってもよい。複数のチャンバを備える装置においてそのうち1つのチャンバであってもよいし、単純にチャンバを1つのみ備える装置であってもよい。チャンバはさらに、複数のステーションを含むとしてよい。この場合、複数のウェハを同時に処理する。処理チャンバは、注入処理、エッチング処理、またはその他のレジストを介して行う処理を実施するチャンバと同じチャンバであってよい。他の実施形態では、ストリッピング処理用に別のチャンバを用意しておく。処理チャンバ内の圧力の範囲は、約600mTorrから2Torrであってよい。特定の実施形態によると、圧力の範囲は、約0.9Torrから1.5Torrである。
好ましい実施形態によると、本発明に係る方法および装置で利用されるワークピースは、半導体ウェハである。利用するウェハのサイズは任意であるとしてよい。大半の最新型のウェハ製造設備では、200mmまたは300mmのいずれかのウェハを利用する。上述したように、本明細書で開示する処理および装置は、エッチング、イオン注入または成膜等の処理動作の後に、フォトレジストをストリッピングする。本発明は、例えば、100nm未満、65nm、または、45nm以下等、非常に小さいフィーチャまたは限界寸法を持つウェハに適している。本明細書で開示しているように、HDISのシリコン損失が低いという特徴は、高性能ロジックデバイスの超浅接合に特に適している。本発明はまた、トランジスタ工程(Front End of the Line:FEOL)のイオン注入処理、特に、高ドーズイオン注入処理が行われるウェハに特に適している。
上述したように、特定の実施形態では、マルチステーションストリッピング装置を利用して、本明細書で説明するフォトレジストおよび残留物をストリッピングする処理を実行する。図5は、ステーション1、2、3、4、5および6を含む当該装置を上から見た様子を示す簡略概略図である。ウェハは、チャンバ501を通って装置のステーション1に入り、各ステーションに順番に当該ステーションで処理を実行するべく輸送され、処理が完了した後にステーション6からチャンバ502を通って出る。当該アーキテクチャによると、パッシベーションプロセスの後にHDISストリッピング用化学物質によるシリコンへの浸食から保護するべくウェハを停止または冷却することができる。
ステーション1でフォーミングガスを利用したパッシベーションを行った後にステーション2−6でF含有ストリッピング処理を実行した場合のSi損失と、パッシベーション処理を行わなかった場合のSi損失とを比較するさまざまな実験を行った。シリコン損失は、54%−82%少なくなった。
Claims (15)
- 反応チャンバにおいて、表面にシリコンを含むワークピースの前記表面からフォトレジストを除去する方法であって、
少なくとも窒素を含むフォーミングガスまたは純粋な窒素ガスから生成されるプラズマにその上にフォトレジストを有する前記ワークピースを暴露する段階と、
前記プラズマに前記ワークピースを暴露する段階の後、少なくとも30秒間にわたって非プラズマ環境に前記ワークピースを放置して、保護膜を前記ワークピースの露出したシリコン部分に形成する段階と、
前記ワークピースを前記非プラズマ環境に放置する段階の後、酸素系または水素系のプラズマに前記ワークピースを暴露して、前記フォトレジストを除去する段階と
を備える方法。 - 前記ワークピースは、少なくとも100秒間にわたって放置されている請求項1に記載の方法。
- 前記ワークピースは少なくとも150秒間にわたって放置されている請求項1に記載の方法。
- 前記ワークピースは少なくとも200秒間にわたって放置されている請求項1に記載の方法。
- 前記ワークピースは少なくとも220秒間にわたって放置されている請求項1に記載の方法。
- 前記酸素系または水素系のプラズマは、フッ素種を含む請求項1から請求項5のうちいずれか一項に記載の方法。
- 前記ワークピースの表面から除去する前記フォトレジストは、高ドーズ注入処理されたレジストを含む請求項1から請求項6のうちいずれか一項に記載の方法。
- 前記フォーミングガスまたは前記純粋な窒素ガスから生成されるプラズマは、リモートに生成される請求項1から請求項7のうちいずれか一項に記載の方法。
- 前記保護膜は、SixNy膜である請求項1から8のいずれか一項に記載の方法。
- 前記ワークピースを暴露する段階は、リソグラフィー処理の後に実行される請求項1から9のうちいずれか一項に記載の方法。
- 表面にシリコンを含むワークピースの前記表面からフォトレジストを除去する装置であって、
反応チャンバと、
一連の命令を実行するコントローラと
を備え、
前記反応チャンバは、
プラズマ源と、
前記プラズマ源の下流に位置しているシャワーヘッドと、
前記シャワーヘッドの下流に位置しており、支持しているワークピースの温度を制御する温度制御メカニズムおよびペデスタルを含むワークピース支持部と
を有し、
前記一連の命令は、
少なくとも窒素を含むフォーミングガスまたは純粋な窒素ガスから前記プラズマ源内にプラズマを生成し、
前記フォーミングガスまたは前記純粋な窒素ガスから生成されるプラズマに前記ワークピースを暴露し、
前記フォーミングガスまたは前記純粋な窒素ガスから生成されるプラズマに前記ワークピースを暴露した後、少なくとも30秒間にわたって非プラズマ環境に前記ワークピースを放置して、保護膜を前記ワークピースの露出したシリコン部分に形成し、
前記ワークピースを放置した後、酸素系または水素系のプラズマに前記ワークピースを暴露して、前記フォトレジストを除去するための命令を含む装置。 - 前記コントローラが含む前記一連の命令は、少なくとも100秒間にわたって前記ワークピースを放置するための命令を含む請求項11に記載の装置。
- 前記コントローラが含む前記一連の命令は、少なくとも150秒間にわたって前記ワークピースを放置するための命令を含む請求項11に記載の装置。
- 前記コントローラが含む前記一連の命令は、少なくとも200秒間にわたって前記ワークピースを放置するための命令を含む請求項11に記載の装置。
- 前記コントローラが含む前記一連の命令は、少なくとも220秒間にわたって前記ワークピースを放置するための命令を含む請求項11に記載の装置。
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