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    • 3. 发明申请
    • PROJECTION OBJECTIVE FOR MICROLITHOGRAPHY, MICROLITHOGRAPHY PROJECTION EXPOSURE APPARATUS WITH SAID PROJECTION OBJECTIVE, MICROLITHOGRAPHIC MANUFACTURING METHOD FOR COMPONENTS, AS WELL AS A COMPONENT MANUFACTURED WITH SAID METHOD
    • 投影目标,微型投影曝光装置与投影目标,组件的微型制造方法,作为使用方法制造的组件
    • WO2008145296A1
    • 2008-12-04
    • PCT/EP2008004084
    • 2008-05-21
    • ZEISS CARL SMT AGKRAEHMER DANIELKAMENOV VLADIMIRTOTZECK MICHAELGOEHNERMEIER AKSEL
    • KRAEHMER DANIELKAMENOV VLADIMIRTOTZECK MICHAELGOEHNERMEIER AKSEL
    • G03F7/20
    • G03F7/70958G03F7/70308G03F7/70341G03F7/70591G03F7/70941
    • Projection objectives of current designs for use in microlithography have a stray light component which varies over the exposure field. The variation of the stray light component over the field can be reduced and/or adapted to the variation of another projection objective by introducing additional stray light. This is accomplished advantageously by pre-adapting or altering the surface roughness of a field- proximate surface and/or by installing optical elements with specifically targeted light scattering properties in a pupil plane. In this, the invention makes use of the observation that the variation of the stray light component over the field and the different respective variations of the stray light components of different projection objectives present greater problems to the manufacturers of semiconductor components than the stray light component itself. Particularly in projection objectives for immersion lithography where a strongly scattering polycrystalline material is used, the invention provides a way to compensate for the increased variation of the stray light component of these projection objectives over the field and to thereby arrive at a stray light component that is constant over the entire field. Furthermore, particularly in the case of projection objectives for EUV lithography, which exhibit a higher stray light component than conventional projection objectives, it is possible to adapt different projection objectives to each other in regard to the stray light component and/or the variation of the stray light component over the exposure field.
    • 用于微光刻的当前设计的投影目标具有在曝光场上变化的杂散光分量。 杂散光分量在场上的变化可以通过引入另外的杂散光而减小和/或适应于另一个投影物镜的变化。 这有利地通过预先适配或改变近场表面的表面粗糙度和/或通过在光瞳平面中安装具有特定目标光散射特性的光学元件来实现。 在此,本发明利用这样的观察:不同投影物镜上的杂散光分量在场上的变化和杂散光分量的不同变化对半导体元件的制造商而言比杂散光部件本身存在更大的问题 。 特别是在使用强散射多晶材料的浸没式光刻的投影物镜中,本发明提供了一种补偿这些投影物体在场上的杂散光成分增加的变化的方法,从而得到杂散光成分 不断在整个领域。 此外,特别是在EUV光刻的投影物镜的情况下,其表现出比常规投射物镜更高的杂散光分量的情况下,可以将杂散光分量和/或杂散光分量的变化 杂散光分量在曝光场上。