JP5371179B2 - フォトマスクのテストパターンイメージから印刷されたテストフィーチャーを用いるフォトリソグラフィ工程における焦点変化を測定するシステム及び方法 - Google Patents
フォトマスクのテストパターンイメージから印刷されたテストフィーチャーを用いるフォトリソグラフィ工程における焦点変化を測定するシステム及び方法 Download PDFInfo
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Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
- G03F9/70—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically for microlithography
- G03F9/7003—Alignment type or strategy, e.g. leveling, global alignment
- G03F9/7023—Aligning or positioning in direction perpendicular to substrate surface
- G03F9/7026—Focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/38—Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
- G03F1/44—Testing or measuring features, e.g. grid patterns, focus monitors, sawtooth scales or notched scales
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/62—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- 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
- G03F7/70625—Dimensions, e.g. line width, critical dimension [CD], profile, sidewall angle or edge roughness
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Description
11、21、31 マスクパターン
12、55、1201 マスク基板
13、23、33 電気場曲線
15、25、35 フォトレジスト層
16、26、36 半導体基板
20 EAPSM
21a ラインフィーチャー
21b スペースパターン
30 AAPSM
45 レチクル
47 フォトレジスト層
48 半導体基板
50、1200 フォトマスク
51 長棒要素
51´ マスク物質層
52 第1の光遮断要素
53 位相棒
54 第2の光遮断要素
60 フォトレジスト層
60a フォトレジストパターン
61 第2のフォトレジストパターン
70、80 フォトマスクパターン
71 長棒
72 補助フィーチャー
81 例示的な棒
1211 フォトレジストパターン
E1、E2、E3、E4、E5 露光エネルギー
Claims (11)
- 第1の印刷テストフィーチャー及び第2の印刷フィーチャーを含む印刷テストパターンを含むフォトレジストパターンが形成された半導体ウェーハを得、
前記第1の印刷テストフィーチャーの印刷最小線幅CD1及び前記第2の印刷テストフィーチャーの印刷最小線幅CD2を決定し、
前記印刷最小線幅CD1、CD2の間の相対的なCD差を決定し、
前記決定された相対的なCD差に基づいてリソグラフィ工程についての最適焦点設定からの焦点誤差のサイズ及び方向を決定することを含み、
前記半導体ウェーハを得る段階は、半導体ウェーハ上に形成されたフォトレジスト層でフォトマスクのマスクパターンイメージを印刷する段階を含み、前記マスクパターンは、少なくとも一つのパターンサイズが目標CDと同一なように形成された第1のテストフィーチャー及び第2のテストフィーチャーを含むマスクテストパターンを含み、
前記マスクテストパターンは、ピッチPほど分離された第1の長棒要素及び第2の長棒要素を含み、これら第1の長棒要素及び第2の長棒要素の間には、印刷されないフィーチャーとして回折効果を補償し、前記第1の長棒要素と第2の長棒要素を連結する格子状の補助フィーチャーが設けられていることを特徴とするリソグラフィ工程の焦点測定方法。 - 焦点誤差条件を補正するため露光装備の焦点設定を自動に調整することをさらに含むことを特徴とする請求項1に記載のリソグラフィ工程の焦点測定方法。
- 前記印刷テストパターンは、焦点誤差のサイズ及び前記相対的なCD差の間に線形的な関係が存在するように形成されることを特徴とする請求項1または2に記載のリソグラフィ工程の焦点測定方法。
- 焦点設定は、前記相対CD差が約0に決定されるとき、前記最適焦点設定にあるものとすることを特徴とする請求項1から3の何れか一項に記載のリソグラフィ工程の焦点測定方法。
- 該当される焦点−露光マトリックスデータを用いて焦点誤差及び相対的なCD差の間の線形的な関係を定量化するリソグラフィ工程モデルを立てることを含むことを特徴とする請求項1から4の何れか一項に記載のリソグラフィ工程の焦点測定方法。
- 前記印刷最小線幅CD1、CD2は、自動に決定されることを含むことを特徴とする請求項1から5の何れか一項に記載のリソグラフィ工程の焦点測定方法。
- 前記第1のテストフィーチャー及び前記第2のテストフィーチャーは、全焦点CD特性を有する第1の印刷テストフィーチャー及び第2の印刷テストフィーチャーを形成するように製造され、 前記全焦点CD特性は、最適焦点位置についてサイズは同じで方向は反対になるように移動されたそれぞれの第1の焦点−露光曲線及び第2の焦点−露光曲線を作り出し、最適焦点位置において実質的に鏡像であることを特徴とする請求項1に記載のリソグラフィ工程の焦点測定方法。
- 前記第1の印刷テストフィーチャー及び前記第2の印刷テストフィーチャーは、フィーチャーPほど分離された長棒要素であり、
前記印刷最小線幅CD1、CD2は、前記印刷された棒フィーチャーのそれぞれの幅を測定して決定することを特徴とする請求項1から7の何れか一項に記載のリソグラフィ工程の焦点測定方法。 - 前記ピッチPは、目標CDの約10倍又はその以上の範囲にあることを特徴とする請求項8に記載のリソグラフィ工程の焦点測定方法。
- フォトマスク素子上に形成されたマスクテストパターンイメージを転写してフォトレジスト層内に前記印刷テストパターンを形成することを含むことを特徴とする請求項1から9の何れか一項に記載のリソグラフィ工程の焦点測定方法。
- 前記第1の棒要素及び前記第2の棒要素は、目標CDと同一なライン幅を有し、
前記第1の長棒要素は、90度位相移動された光について実質的に100%の透過率を提供することに適した内部非印刷フィーチャーを含み、
前記第2の長棒要素は、270度位相移動された光について実質的に100%の透過率を提供することに適した内部非印刷フィーチャーを含むことを特徴とする請求項1から10の何れか一項に記載のリソグラフィ工程の焦点測定方法。
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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US67162605P | 2005-04-15 | 2005-04-15 | |
US60/671,626 | 2005-04-15 | ||
US67366905P | 2005-04-21 | 2005-04-21 | |
US60/673,669 | 2005-04-21 | ||
US11/324,739 US7642019B2 (en) | 2005-04-15 | 2006-01-03 | Methods for monitoring and adjusting focus variation in a photolithographic process using test features printed from photomask test pattern images; and machine readable program storage device having instructions therefore |
US11/324,739 | 2006-01-03 |
Publications (3)
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JP2006303498A JP2006303498A (ja) | 2006-11-02 |
JP2006303498A5 JP2006303498A5 (ja) | 2009-05-28 |
JP5371179B2 true JP5371179B2 (ja) | 2013-12-18 |
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Country | Link |
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US (2) | US7642019B2 (ja) |
JP (1) | JP5371179B2 (ja) |
KR (1) | KR100714480B1 (ja) |
DE (1) | DE102006017938B4 (ja) |
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US20100081068A1 (en) | 2010-04-01 |
US7855037B2 (en) | 2010-12-21 |
KR20060109310A (ko) | 2006-10-19 |
US7642019B2 (en) | 2010-01-05 |
US20060234136A1 (en) | 2006-10-19 |
DE102006017938B4 (de) | 2011-07-28 |
KR100714480B1 (ko) | 2007-05-04 |
DE102006017938A1 (de) | 2006-11-16 |
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