Patent ID: 7312020
Filing Date: 2007-12-25
Classification: G03F

Abstract:
1. A lithography method for forming a plurality of patterns in a photoresist layer on a substrate, the method comprising the following steps: providing a phase shift mask (PSM) comprising a plurality of transparent main features, a plurality of first phase shift transparent regions, and a plurality of second phase shift transparent regions, each of the transparent main features being surrounded by the first phase shift transparent regions and the second phase shift transparent regions in a way that the first phase shift transparent regions and the second phase shift transparent regions are interlaced contiguously along a periphery of one of the transparent main features and the first phase shift transparent regions and the second phase shift transparent regions along the periphery have a boundary with each other and a boundary with the transparent main feature, and each of the first phase shift transparent regions having a phase shift relative to each of the second phase shift transparent regions; and performing an exposure process to irradiate the photoresist layer through the phase shift mask with light so that the patterns corresponding to the transparent main features are formed in the photoresist layer.