JP6182737B2 - ウエハの特性決定のための方法とシステム - Google Patents
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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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
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- G—PHYSICS
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Description
本出願は、2006年2月9日に出願された米国仮出願60/772,418号「ウエハの特性決定のための方法とシステム」への優先権を請求するものであり、該仮出願はここに詳述された参照文献として取り扱われる。
Claims (29)
- ウエハの特性を決定するための方法であって、当該方法は、
出力が、ウエハ上の欠陥に対応する第一出力と、欠陥に対応しない第二出力を含む条件下で、ウエハ上の欠陥を検知する検査システムを用い、ウエハからの光に対応する出力を生成することと、
前記第一出力を用いてウエハ上の欠陥を検知すること、
前記第一出力ではなく前記第二出力を用いて、ウエハの特性の値を決定すること、
を含み、
前記第一出力と前記第二出力は同一の検知器により生成され、
前記決定することが、第二出力と前記特性の間の予め定められた相関を用い、前記第二出力を較正して前記特性の値を決定すること
を含み、前記特性は、計測学ツールを用いて測定可能なウエハの非欠陥関連特性であり、前記非欠陥関連特性は前記検査システムによって前記ウエハ上の欠陥として検知されないエクスカーションを検知するための半導体製造プロセスのインライン監視と制御とに使用されるために決定されるウエハの物理的量である
ことを特徴とするウエハの特性を決定するための方法。 - 前記ウエハからの光が、拡散散乱光を含むことを特徴とする請求項1に記載の方法。
- 前記生成することが、レーザーにより生成された光によりウエハを照らすことを含む請求項1に記載の方法。
- 前記生成することが、ウエハに亘り光を走査し、ウエハに亘り前記出力を生成することを含む請求項1に記載の方法。
- 前記生成することが、ウエハの実質的全表面に亘り前記出力を生成することを含む請求項1に記載の方法。
- 前記生成することが、ウエハの実質的全表面に亘り前記出力を生成することを含み、更に、前記決定することが、ウエハの実質的全表面に亘り生成された前記第二出力を用いて、前記特性の値を決定することを含む請求項1に記載の方法。
- 更に、前記決定することが、ウェハ領域に亘る前記第二出力値を決定することと、前記第二出力値から前記特性の値を決定することを含む請求項1に記載の方法。
- 前記特性が、ウエハ上の領域に亘る特性の平均値であることを特徴とする請求項1に記載の方法。
- 更に、前記決定することが、ウエハに亘る前記第二出力の変動を決定し、該変動から前記特性の値を決定することを含む請求項1に記載の方法。
- 更に、前記決定することが、ウエハの実質的全表面に亘り前記第二出力の二次元マップを生成し、該二次元マップより前記特性の値を決定することを含む請求項1に記載の方法。
- 更に、前記決定することが、ウエハ上の異なる領域に亘る前記第二出力に関する値を決定し、そして該値を用い、異なる領域に関する前記特性の値を決定することを含むことを特徴とする請求項1に記載の方法。
- 更に、前記決定することが、ウエハ上の異なる領域に関する特性の単一の値を決定することを含んでおり、そして異なる領域のそれぞれは、ウエハ上のパターン化された特徴の領域よりも大きいことを特徴とする請求項1に記載の方法。
- 更に、前記生成することが、検査システムのマルチ・チャネルを用いて出力を生成することを含んでいることを特徴とし、前記決定することが、マルチ・チャネルの内の一つのチャネルにより生成された前記第二出力を用いて、前記特性の値を決定することを特徴とし、そして更に方法が、マルチ・チャネルの内の別の一つのチャネルより前記第二出力を用いて、ウエハの異なる特性を決定することを特徴とする請求項1に記載の方法。
- 更に、特性を用いて、統計的工程管理を実施することを特徴とする請求項1に記載の方法。
- 更に、ウエハ上の異なる領域に関する前記第二出力の標準偏差を決定し、該標準偏差が、ウエハ形成に用いられたプロセス内の前記エクスカーションを示すかを決定することを特徴とする請求項1に記載の方法。
- 更に、ウエハに亘り前記第二出力の変動を決定することと、ウエハの形成に使用されたプロセス・ツールの特徴に該変動が関連しているかを決定することを特徴とする請求項1に記載の方法。
- 更に、ウエハの実質的全表面に亘り前記第二出力の二次元マップを生成すること、前記二次元マップ内に異常なパターンが存在するかを決定すること、そして、異常なパターンが存在する場合、該異常パターンが、ウエハの形成に用いられたプロセス内の前記エクスカーションに対応するかを決定することを特徴とする請求項1に記載の方法。
- 前記異常パターンが、湿式洗浄の不具合を含むことを特徴とする請求項17に記載の方法。
- 前記ウエハが、パターン化されていないウエハを含むことを特徴とする請求項1に記載の方法。
- 前記ウエハが、パターン化されたウエハを含むことを特徴とする請求項1に記載の方法。
- 更に、前記出力を用いてウエハ上の欠陥を検知することを特徴とする請求項1に記載の方法。
- 更に、前記出力が、ヘイズマップを含んでいることを特徴とする請求項1に記載の方法。
- 更に、前記出力が、ヘイズ測定値を含んでいることを特徴とする請求項1に記載の方法。
- 更に、前記光が、散乱光を含んでいることを特徴とする請求項1に記載の方法。
- 前記特性が、ウエハ上に形成された素子に影響を与えることを特徴とする請求項1に記載の方法。
- 更に、前記生成の前に、ウエハが清浄ツールで処理されることを特徴とする請求項1に記載の方法。
- 更に、前記第一出力が、出力に対して閾値を適用することで認識されることを特徴とする請求項1に記載の方法。
- 更に、前記欠陥に対応する第一出力が、ウエハ表面からのノイズ又は散乱光に対応した出力と区別して認識されることを特徴とする請求項1に記載の方法。
- ウエハ上の欠陥を検知する検査システムを含んだウエハの特性を決定するためのシステムであって、当該システムは、
出力が、ウエハ上の欠陥に対応する第一出力と、欠陥に対応しない第二出力を含む条件下で、ウエハに光を当て、ウエハからの光に対応する出力を生成するように設定された検査サブシステムと、
ウエハ上の欠陥を検知する前記第一出力ではなく前記第二出力を用いて、ウエハの特性の値を決定するように設定されたプロセッサとを備え、
前記第一出力と前記第二出力とは、前記検査サブシステムにおける同一の検知器で検知され、
前記ウエハの特性の値は、予め定められた第二出力と特性との相関関係を用いて前記第二出力を較正して測定され、
前記特性は、計測学ツールを用いて測定可能な非欠陥関係特性であり、前記非欠陥関連特性は前記検査システムによって前記ウエハ上の欠陥として検知されないエクスカーションを検知するための半導体製造プロセスのインライン監視と制御とに使用されるために決定されるウエハの物理量である
ことを特徴とするウエハの特性を決定するためのシステム。
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JP (3) | JP2009526240A (ja) |
KR (1) | KR101324419B1 (ja) |
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