Patent ID: 7838178
Filing Date: 2010-11-23
Classification: G03F

Abstract:
1. A method of making a mask for a microlithography apparatus used in semiconductor processing, comprising: forming a mask layer on a substrate, wherein the substrate is transmissive to a radiation and the mask layer has a plurality of openings arranged in an array corresponding to a desired pattern of features to be formed in a die of a semiconductor wafer; identifying a first opening in the mask layer corresponding to a first feature site at which an intensity of the radiation at a focal zone is less than the intensity of the radiation at the focal zone for a second feature site corresponding to a second opening in the mask proximate to the first opening; and based on the identification, forming a first surface at the identified first opening and a second surface at the second opening such that radiation passing through the second opening constructively interferes with radiation passing through the first opening at the focal zone.