JP6671411B2 - ウェハ保持装置上のメッキの検知 - Google Patents
ウェハ保持装置上のメッキの検知 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9501—Semiconductor wafers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/001—Apparatus specially adapted for electrolytic coating of wafers, e.g. semiconductors or solar cells
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
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- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Electrodes Of Semiconductors (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
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Description
本出願は、参照によりその全体を全ての目的のために本明細書に組み込まれる2013年2月15日に出願された発明の名称を「ウェハ保持装置上のメッキの検知」とする米国仮特許出願第61/765502号に基づく優先権を主張する。
堆積手順の第1の例:
ウェハ表面:Cu+2+e-(ウェハ表面)→Cu+1
カップ底部:2Cu+1→Cu+Cu+2
堆積手順の第2の例:
ウェハ表面:A +e-→A-(還元性添加物の形成)
カップ底部:Cu+2+2A-→Cu+2A
本明細書の特定の実施形態は、残留金属堆積物がカップ底部上に存在するか否か、及びどの程度存在するかを検知する方法を提供する。これらの方法は洗浄操作と同時に、又はその直後に実行されてよいが、メッキが発生しない任意の時に実施されてもよい。ある場合には、検知方法は自動洗浄プロセスを行う度に実行される。他の場合には、検知方法はこれより高い又は低い頻度で実行される。例えば、各ウェハを処理した後、特定の数のウェハを処理した後、電着プロセス中に特定の量の電荷(例えばクーロンで測定)が移動した後、又は電着プロセス中にフィルムの特定の総量若しくは厚さが蒸着された後に、検知を行ってよい。
一実施形態では、電気メッキ装置は装置に組込まれた検知機構を含む。電気メッキ装置は、メッキ中にウェハを保持するためのカップ、ウェハとカップの間の境界面を封止する役割を果たすリップシール、メッキ中にウェハに電流/電位を印加するための電気的接触、及び従来の電気メッキ装置の他の構成部品(例えば入口及び出口を有する電気メッキチャンバ等)を含む。検知機構は、異なるウェハの処理の間に所定の位置に揺動するアーム上に配置され得る。更に、検知機構は自動洗浄アセンブリ上に直接組み込まれても良い(自動洗浄アセンブリ自体は、電気メッキ装置に組込まれていてもいなくてもよい)。この実施形態は、図1に示すように、検知機構及び自動洗浄機構の両方を、必要な場合に所定の位置に移動する単一のスイングアーム上に配置し得るので、有利である。単一のスイングアームを有すれば、装置がよりコンパクトになり、使用が容易になり、また製造コストが低くなるため、有益である。更に、複数のスイングアームを使用する場合と比較して、潜在的に故障の可能性がある箇所(ポイント)が少なくなるため、単一のスイングアームは有利となり得る。別の実施形態では、検知機構はスタンドアロン型の機器であってよく、自動洗浄ステーション内、メッキセル内、又は検知を目的とする何らかの他の場所に設置されてよい。多数の電気メッキセル内の複数のウェハホルダが単一の検知機構を容易に共有できるため、このスタンドアロン型実施形態は有益であり得る。
図4は、電着装置の概略平面図である。電着装置400は、3つの個別の電気メッキモジュール402、404及び406を含んでよい。電着装置400はまた、様々な他のプロセス動作のために構成されている3つの別個のモジュール412、414及び416も含むことができる。例えば、いくつかの実施形態では、モジュール412、414及び416のうちの1つ又は複数は、急速回転すすぎ乾燥(SRD)モジュールであってよい。別の実施形態では、モジュール412、414及び416のうちの1つ又は複数は、ポストエレクトロフィル(ポスト電界メッキ処理)モジュール(PEM)であってよく、これらはそれぞれ、電気メッキモジュール402、404及び406のうちの1つによって処理した後、縁部の面取り部の除去、背面側エッチング、及び基板の酸洗浄等の機能を実施するよう構成される。
Claims (14)
- 電気メッキ装置であって、
電解質を含むよう構成された反応チャンバと、
前記反応チャンバ内で基板の周囲を支持する基板ホルダであって、前記基板ホルダは底部及び内側縁部を有する基板ホルダと、
前記基板ホルダの前記底部上における金属堆積物の存在又は不存在を検知するように構成されている検知用ハードウェアと、
コントローラであって、
前記反応チャンバで前記基板受け取り、
前記基板上に材料を電気メッキし、
前記基板ホルダの前記底部上における前記金属堆積物の存在又は不存在を検知するために前記検知用ハードウェアを操作すること、を行わせるように構成されているコントローラと、を備える、電気メッキ装置。 - 請求項1に記載の電気メッキ装置において、前記コントローラは、前記基板ホルダの前記底部上における前記金属堆積物の存在の検知に応答して、補修作業を行わせるように構成されている、電気メッキ装置。
- 請求項2に記載の電気メッキ装置において、前記補修作業を行うことは、前記基板ホルダを洗浄することを含む、電気メッキ装置。
- 請求項3に記載の電気メッキ装置において、前記補修作業を行うことは、前記基板ホルダを自動的に洗浄することを含む、電気メッキ装置。
- 請求項3に記載の電気メッキ装置において、前記補修作業を行うことは、前記基板ホルダを手動で洗浄することを含む、電気メッキ装置。
- 請求項2から5のいずれか一項に記載の電気メッキ装置において、前記補修作業を行うことは、前記反応チャンバをシャットダウンすることを含む、電気メッキ装置。
- 請求項2から6のいずれか一項に記載の電気メッキ装置において、前記補修作業を行うことは、アラームを起動させることを含む、電気メッキ装置。
- 請求項1から7のいずれか一項に記載の電気メッキ装置において、前記コントローラは、前記基板ホルダの前記底部上における前記金属堆積物の不存在の検知に応答して、前記基板ホルダを洗浄することなく、前記反応チャンバで第2の基板を受け取って前記第2の基板上に材料を電気メッキさせるように構成されている、電気メッキ装置。
- 請求項1から8のいずれか一項に記載の電気メッキ装置において、前記検知用ハードウェアは、前記基板ホルダの前記底部上の検知領域における前記金属堆積物の存在又は不存在を検知し、前記検知領域は前記基板ホルダの前記内側縁部から約5mm以上延在する、電気メッキ装置。
- 請求項1から9のいずれか一項に記載の電気メッキ装置において、
前記基板ホルダは、前記電気メッキ装置における複数の基板ホルダの1つであり、
前記検知用ハードウェアは、前記複数の基板ホルダの各々の上における前記金属堆積物の存在又は不存在を検知するように構成されている、電気メッキ装置。 - 請求項1から10のいずれか一項に記載の電気メッキ装置において、前記基板ホルダから前記金属堆積物を除去するための洗浄用アセンブリを更に備える、電気メッキ装置。
- 請求項1から11のいずれか一項に記載の電気メッキ装置において、前記検知用ハードウェアの操作は、前記基板ホルダの前記底部に光源からの光を照射し、前記基板ホルダの前記底部から反射した反射光を測定することを備える、電気メッキ装置。
- 請求項1から11のいずれか一項に記載の電気メッキ装置において、前記検知用ハードウェアの操作は、
前記基板ホルダの前記底部付近に配置されている円形の一次励起コイルに交番電流を流し、これにより、前記基板ホルダの前記底部と相互作用して渦電流を発生させる交番磁場を生成し、
前記金属堆積物の存在又は不存在を検知するために、前記渦電流の位相及び/又は大きさを測定すること
を備える、電気メッキ装置。 - 請求項1から11のいずれか一項に記載の電気メッキ装置において、前記検知用ハードウェアの操作は、
前記基板の前記底部と接触する2つ以上の電気的接触部を提供し、前記2つ以上の電気的接触部間には電気的接続が存在し、
前記2つ以上の電気的接触部の間の前記基板ホルダの前記底部上に前記金属堆積物が存在する場合には、前記金属堆積物は前記2つ以上の電気的接触部の間に回路を完成し、前記2つ以上の電気的接触部の間の前記基板ホルダの前記底部上に前記金属堆積物が存在しない場合には、前記2つ以上の電気的接触部の間に回路が完成されないように、少なくとも1つの前記電気的接触部を介して電流を流し、
前記基板ホルダの前記底部上における前記金属堆積物の存在又は不存在を検知するために、電気的特性を測定すること、を備える、電気メッキ装置。
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