JP5232871B2 - 回折ベースのオーバレイメトロロジーツール及びその方法 - Google Patents
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- 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
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95607—Inspecting patterns on the surface of objects using a comparative method
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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- G03F7/70—Microphotolithographic exposure; Apparatus therefor
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70605—Workpiece metrology
- G03F7/70616—Monitoring the printed patterns
- G03F7/70633—Overlay, i.e. relative alignment between patterns printed by separate exposures in different layers, or in the same layer in multiple exposures or stitching
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
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- G03F7/706843—Metrology apparatus
- G03F7/706849—Irradiation branch, e.g. optical system details, illumination mode or polarisation control
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- 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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Description
[0001] 本出願は、参照によりその全体を本明細書に組み込むものとする2007年12月17日出願の米国仮出願第61/006,073号の利益を主張する。
I+ = I- = I+0 式(1)
上式で、I+0は、対称の複合格子の1次回折ビームの強度を示す。
I+ = I+0 + K × ε 式(2)
上式で、Kは比例定数である。
−1次回折ビームB−の強度I−は、以下の式で近似される。
I- = I+0 − K × ε 式(3)
差分ΔI=I+−I−を計算することで、オーバレイ誤差εと直線的に拡大縮小する信号が得られる。
ΔI = 2K × ε 式(4)
第1のバイアスされた複合格子の場合、
ΔI1 = K × (ε + d) 式(5)
第2のバイアスされた複合格子の場合、
ΔI2 = K × (ε − d) 式(6)
式(7)
Claims (18)
- 基板の表面の第1のパターンと該第1のパターンに重畳した第2のパターンとの間のオーバレイ誤差を決定する方法であって、前記第1のパターンが第1の格子を含み、前記第2のパターンが前記第1の格子の上の第2の格子を含み、前記第2の格子が前記第1の格子と実質的に同一のピッチを有し、前記第2及び第1の格子が複合格子を形成し、前記方法が、
固定位置にある前記基板の前記表面に沿った第1の水平方向にある成分を有する方向に第1の照明ビームが伝搬するように、少なくとも前記複合格子をある入射角で照明する該第1の照明ビームを提供するステップと、
前記複合格子からの1次回折ビームだけの第1の強度を像面にて測定するステップと、
前記固定位置にある前記基板の前記表面に沿った前記第1の水平方向と逆向きの第2の水平方向に第2の照明ビームがある成分を有するように、少なくとも前記複合格子を前記入射角で照明する該第2の照明ビームを提供するステップと、
前記複合格子からの−1次回折ビームだけの第2の強度を像面にて測定するステップと、
を含む方法。 - 前記第1の強度を測定するステップが、パターン認識によって前記1次回折ビームだけによって得られる前記複合格子の画像を検出することを含み、
前記第2の強度を測定するステップが、パターン認識によって前記−1次回折ビームだけによって得られる前記複合格子の画像を検出することを含む、請求項1に記載の方法。 - 前記第1の強度と前記第2の強度との強度差を決定するステップであって、該強度差が、前記第1の格子と前記第2の格子との間の前記オーバレイ誤差に比例する、ステップをさらに含む、請求項1又は2に記載の方法。
- 前記第1及び第2の照明ビームが、共通の照明ビームの一部である、請求項1乃至3のいずれかに記載の方法。
- 前記共通の照明ビームが、環状の断面を有する、請求項4に記載の方法。
- 前記入射角が、前記基板表面に対して斜めであり、前記基板表面の法線に対する回折ビームの回折角が、前記入射角より小さい、請求項1乃至5のいずれかに記載の方法。
- 前記入射角が、前記基板表面に実質的に垂直であり、
該方法が、前記第2の照明ビームとして前記第1の照明ビームを使用するステップを含み、
前記複合格子からの前記回折ビームの前記第1の強度を測定するステップ及び前記複合格子からの前記回折ビームの前記第2の強度を測定するステップが、前記第1の照明ビームが提供されている間に連続的に実行される、請求項1乃至5のいずれかに記載の方法。 - 前記第1の照明ビームを提供する時に、前記1次回折次数以外の回折次数のビームを阻止するステップと、
前記第2の照明ビームを提供する時に、前記−1次回折次数以外の回折次数のビームを阻止するステップとを含む、請求項1乃至7のいずれかに記載の方法。 - 前記基板上に追加の複合格子を提供するステップであって、該追加の複合格子が、前記第1のパターン内の第3の格子と、前記第1の格子の上の第4の格子とによって形成され、該第3の格子及び該第4の格子が、前記第1及び前記第2の格子と実質的に同一のピッチを有し、前記複合格子が、格子方向に沿ったシフト方向に第1のシフト量だけバイアスされ、前記追加の複合格子が、格子方向に沿った前記シフト方向に第1のシフト量と異なる第2のシフト量だけバイアスされる、ステップと、
前記固定位置にある前記基板の前記表面に沿った前記第1の水平方向にある成分を有する方向に前記第1の照明ビームが伝搬するように、前記追加の複合格子を前記入射角で照明する前記第1の照明ビームを提供するステップと、
前記追加の複合格子からの1次回折ビームだけの第1の強度を像面にて測定するステップと、
前記基板の前記表面に沿った前記第2の水平方向にある成分を有する方向に前記第2の照明ビームが伝搬するように、前記追加の複合格子を前記入射角で照明する前記第2の照明ビームを提供するステップと、
前記追加の複合格子からの−1次回折ビームだけの第2の強度を像面にて測定するステップと、
をさらに含む、請求項1乃至8のいずれかに記載の方法。 - 基板の表面の第1のパターンと該第1のパターンに重畳した第2のパターンとの間のオーバレイ誤差を決定する検出システムであって、前記第1のパターンが第1の格子を含み、前記第2のパターンが前記第1の格子の上の第2の格子を含み、前記第2の格子が前記第1の格子と実質的に同一のピッチを有し、前記第2及び第1の格子が複合格子を形成し、前記システムが、
(a)基板位置にある前記基板の前記表面に沿った第1の水平方向にある成分を有する方向に第1の照明ビームが伝搬するように、前記基板上の前記複合格子をある入射角で照明する該第1の照明ビームを形成し、(b)前記基板位置にある前記基板の前記表面に沿った前記第1の水平方向と逆向きの第2の水平方向にある成分を有する方向に第2の照明ビームが伝搬するように、前記基板上の前記複合格子をある入射角で照明する該第2の照明ビームを形成する照明源と、
前記複合格子からの1次及び−1次回折ビームだけを像面にて受光する画像検出器と、
前記基板位置と前記画像検出器との間の光路に沿って配置された複数のレンズと、
開口絞りと、
を備える検出システム。 - 前記画像検出器が、パターン認識方法によって、前記1次回折ビームと前記−1次回折ビームだけを用いて前記複合格子の画像を検出する、請求項10に記載の検出システム。
- 前記開口絞りが、前記第1の照明ビームを形成する時には、前記1次回折次数以外の回折次数のビームを阻止し、前記第2の照明ビームを形成する時には、前記−1次回折次数以外の回折次数のビームを阻止する、請求項10又は11に記載の検出システム。
- 前記複数のレンズが、少なくとも前記基板表面に隣接する対物レンズと、前記画像検出器に隣接する投影レンズとを備え、前記開口絞りが、前記対物レンズと前記投影レンズとの間の前記光路に沿って配置され、
前記対物レンズが第1の開口数の値を有し、前記開口絞りが第2の開口数の値を有し、前記第2の開口数の値が前記第1の開口数の値より小さい、請求項10乃至12のいずれかに記載の検出システム。 - 基板の表面の第1のパターンと該第1のパターンに重畳した第2のパターンとの間のオーバレイ誤差を決定する検出システムを備えるリソグラフィ装置であって、前記第1のパターンが第1の格子を含み、前記第2のパターンが前記第1の格子の上の第2の格子を含み、前記第2の格子が前記第1の格子と実質的に同一のピッチを有し、前記第2及び第1の格子が複合格子を形成し、前記検出システムが、
(a)基板位置にある前記基板の前記表面に沿った第1の水平方向にある成分を有する方向に第1の照明ビームが伝搬するように、前記基板上の前記複合格子をある入射角で照明する該第1の照明ビームを形成し、(b)前記基板位置にある前記基板の前記表面に沿った前記第1の水平方向と逆向きの第2の水平方向にある成分を有する方向に第2の照明ビームが伝搬するように、前記基板上の前記複合格子をある入射角で照明する該第2の照明ビームを形成する照明源と、
前記複合格子からの1次及び−1次回折ビームだけを像面にて受光する画像検出器と、
前記基板位置と前記画像検出器との間の光路に沿って配置された複数のレンズと、
開口絞りと、
を備える、リソグラフィ装置。 - 放射ビームを調節する照明システムと、
前記放射ビームをパターニングしてパターン付放射ビームを形成するパターニングデバイスを保持するパターニングデバイス支持体と、
前記基板を保持する基板テーブルと、
前記パターン付放射ビームを前記基板上に投影する投影システムと、
をさらに備える、請求項14に記載のリソグラフィ装置。 - 前記検出システムの前記画像検出器が、パターン認識方法によって、前記1次回折ビームと前記−1次回折ビームだけを用いて前記複合格子の画像を検出する、請求項14又は15に記載のリソグラフィ装置。
- 前記検出システムの前記開口絞りが、前記第1の照明ビームを形成する時には、前記1次回折次数以外の回折次数のビームを阻止し、前記第2の照明ビームを形成する時には、前記−1次回折次数以外の回折次数のビームを阻止する、請求項14乃至16のいずれかに記載のリソグラフィ装置。
- 前記検出システムの前記複数のレンズが、少なくとも前記基板表面に隣接する対物レンズと、前記画像検出器に隣接する投影レンズとを備え、前記開口絞りが、前記対物レンズと前記投影レンズとの間の前記光路に沿って配置され、
前記対物レンズが第1の開口数の値を有し、前記開口絞りが第2の開口数の値を有し、前記第2の開口数の値が前記第1の開口数の値より小さい、請求項14乃至17のいずれかに記載のリソグラフィ装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US607307P | 2007-12-17 | 2007-12-17 | |
US61/006,073 | 2007-12-17 | ||
PCT/NL2008/050785 WO2009078708A1 (en) | 2007-12-17 | 2008-12-09 | Diffraction based overlay metrology tool and method |
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JP2011507264A JP2011507264A (ja) | 2011-03-03 |
JP5232871B2 true JP5232871B2 (ja) | 2013-07-10 |
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