JP7178932B2 - 露光装置、および物品製造方法 - Google Patents
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Description
図1は、実施形態における露光装置の構成を示す図である。本明細書および添付図面において、基板であるウエハ115の表面(水平面)をXY平面とするXYZ座標系において方向を示す。XYZ座標系におけるX軸、Y軸、Z軸にそれぞれ平行な方向をX方向、Y方向、Z方向とし、X軸周りの回転、Y軸周りの回転、Z軸周りの回転をそれぞれθX、θY、θZとする。
式1で示される回転非対称な形状は、θ=0°の方向(X軸方向)と、
ρ=sqrt(x2+y2)
をパラメータとした極座標表示で表すと、
Z=ρ3sin3θ・・・(2)
と等価であり、図5に示すような3回回転対称の非球面形状となる。
Φ≒K*α*R3cos3θ
と表される(ただし、Kは定数)。一方、第1光学素子211が距離dだけZ駆動すると相補性が崩れ、dが十分小さいとき、位相差は、
Φ≒L*d*R3sin3θ
と表される(ただし、Lは定数)。
Z=g(ρ)sin3θ+F・・・(6)
このように、3回回転対称の非球面を持つ光学要素の回転およびZ駆動の少なくともいずれかにより、効果的に下地の台形形状のディストーションを補正することができる。
次に、図10を参照して、台形形状を持つ歪曲収差を調整する収差補正部材21を用いた露光方法の別の例について説明する。S11で、主制御部103は、露光前に、前のショットの露光光によるウエハ変形の影響度の情報を取得する。露光光によるウエハ変形の影響度は、例えば、露光エネルギーによる入熱パラメータと、前ショットからのステージ移動ベクトルに関するパラメータと、ウエハの物性に関するパラメータ等の露光条件に基づいて決定される。
本発明の実施形態に係る物品製造方法は、例えば、半導体デバイス等のマイクロデバイスや微細構造を有する素子等の物品を製造するのに好適である。本実施形態の物品製造方法は、基板に塗布された感光剤に上記の露光装置を用いて潜像パターンを形成する工程(基板を露光する工程)と、かかる工程で潜像パターンが形成された基板を現像する工程とを含む。更に、かかる製造方法は、他の周知の工程(酸化、成膜、蒸着、ドーピング、平坦化、エッチング、レジスト剥離、ダイシング、ボンディング、パッケージング等)を含む。本実施形態の物品製造方法は、従来の方法に比べて、物品の性能・品質・生産性・生産コストの少なくとも1つにおいて有利である。
本発明は、上述の実施形態の1以上の機能を実現するプログラムを、ネットワーク又は記憶媒体を介してシステム又は装置に供給し、そのシステム又は装置のコンピュータにおける1つ以上のプロセッサがプログラムを読み出し実行する処理でも実現可能である。また、1以上の機能を実現する回路(例えば、ASIC)によっても実現可能である。
Claims (14)
- 原版のパターンを投影光学系を介して基板のショット領域に投影して前記基板を露光する露光装置であって、
前記原版と前記基板との間の露光光の光路上に配置された収差補正部材と、
前記収差補正部材を駆動する駆動部と、を有し、
前記収差補正部材は、
3回回転対称な非球面形状を持つ第1面を有する第1光学要素と、
前記投影光学系の光軸に沿って前記第1光学要素とは離間して配置された第2光学要素であって、前記第1面と対向し、前記第1面が有する前記非球面形状と相補的な関係にある非球面形状を有する第2面を有する第2光学要素と、を含み、
前記駆動部は、前記ショット領域の形状の台形成分に基づいて、前記第1光学要素および前記第2光学要素の少なくとも1つの、前記光軸周りの回転および前記光軸に沿う駆動の少なくともいずれかを行う
ことを特徴とする露光装置。 - 前記光軸に平行な方向をZ軸とし、前記Z軸と直交する平面上で互いに直交する方向をX軸およびY軸とするとき、前記駆動部が前記第1光学要素および前記第2光学要素の少なくとも1つのZ軸周りに回転およびZ軸に沿う駆動の少なくともいずれかを行うことにより、ショット領域のY軸に沿う方向の2つの辺の長さおよびX軸に沿う方向の2つの辺の長さが補正されることを特徴とする請求項1に記載の露光装置。
- 前記光軸周りの回転の回転量および前記光軸に沿う駆動の駆動量の少なくともいずれかを制御する制御部を有することを特徴とする請求項1または2に記載の露光装置。
- 前記駆動部は、前記第1光学要素および前記第2光学要素の少なくとも1つの、前記光軸と直交する方向への駆動を更に行うことを特徴とする請求項1乃至3のいずれか1項に記載の露光装置。
- 前記収差補正部材は、前記原版と前記投影光学系との間に配置されることを特徴とする請求項1乃至4のいずれか1項に記載の露光装置。
- 前記収差補正部材は、前記投影光学系の内部に設けられることを特徴とする請求項1乃至4のいずれか1項に記載の露光装置。
- 前記収差補正部材は、前記原版を保持するレチクルステージに設けられることを特徴とする請求項1乃至4のいずれか1項に記載の露光装置。
- 前記制御部は、前記基板の下地となるショット領域の形状のデータを取得し、該取得したデータに基づいて、前記光軸周りの回転の回転量および前記光軸に沿う駆動の駆動量の少なくともいずれかを制御することを特徴とする請求項3に記載の露光装置。
- 前記ショット領域の形状を計測する計測部を更に有し、
前記制御部は、前記計測部から前記ショット領域の形状のデータを取得することを特徴とする請求項8に記載の露光装置。 - 前記制御部は、前記基板の変形の影響度の情報を取得し、前記取得された情報に基づいて、前記光軸周りの回転の回転量および前記光軸に沿う駆動の駆動量の少なくともいずれかを制御することを特徴とする請求項3に記載の露光装置。
- 前記情報は、前記基板の複数のショット領域の露光順序の情報を含むことを特徴とする請求項10に記載の露光装置。
- 前記情報は、更に、前記基板の上の感光剤への露光量、前記基板を保持する基板ステージの蓄熱量、前記基板ステージのショット領域間の駆動時間、前記基板の線膨張係数、熱伝導率、露光光反射率、透過率のうちの少なくともいずれかを含むことを特徴とする請求項11に記載の露光装置。
- 前記台形成分は、前記基板の変形の影響度に基づいて予測されることを特徴とする請求項1乃至12のいずれか1項に記載の露光装置。
- 請求項1乃至13のいずれか1項に記載の露光装置を用いて基板を露光する工程と、
前記露光された基板を現像する工程と、
を含み、前記現像された基板から物品を製造することを特徴とする物品製造方法。
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