Lithographic apparatus, device manufacturing methods, mask and method of characterizing a mask and/or pellicle
First Claim
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1. A mask having a pellicle fixed to a frame in spaced relation thereto, wherein said pellicle is fixed to said frame such that in use during exposure in a lithographic apparatus, the pellicle adopts a shape that introduces imaging effects that are substantially compensatable for by adjustment of available system parameters of a lithographic apparatus with which the mask is to be used.
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Abstract
A thick pellicle is allowed to have a non-flat shape and its shape is characterized to calculate corrections to be applied in exposures to compensate for the optical effects of the pellicle. The pellicle may be mounted so as to adopt a one-dimensional shape under the influence of gravity to make the compensation easier.
26 Citations
18 Claims
- 1. A mask having a pellicle fixed to a frame in spaced relation thereto, wherein said pellicle is fixed to said frame such that in use during exposure in a lithographic apparatus, the pellicle adopts a shape that introduces imaging effects that are substantially compensatable for by adjustment of available system parameters of a lithographic apparatus with which the mask is to be used.
- 10. A mask having a pellicle fixed to a frame in spaced relation thereto, wherein said pellicle is fixed to said frame such that in use during exposure in a lithographic apparatus, the pellicle adopts a substantially one-dimensional non-flat shape when in the orientation in which it will be used for the exposure in the lithographic apparatus.
Specification