Patent ID: 7287240
Filing Date: 2007-10-23
Classification: G03F,G06F,Y02P

Abstract:
1. A method for designing a phase shift mask, having a substrate ( 200 ) with a transparent property, and an opaque layer ( 100 ) formed on said substrate and having an opaque property, wherein a plurality of rectangular apertures are formed in said opaque layer, a two-dimensional layout pattern is formed by opaque parts ( 120 ) comprising regions at which said opaque layer is formed, and transparent parts ( 110 ) comprising regions at which said apertures are formed, and for a pair of adjacently disposed apertures, so that a phase of light transmitted through one of said pair of adjacent apertures will be shifted by 180 degrees with respect to a phase of light transmitted through other of said pair of adjacent apertures, a trench ( 220 ), having a predetermined depth and an outline greater than an outline of said one aperture, is formed on a portion of said substrate at which said one aperture is formed, said phase shift mask designing method comprising the steps of: a two-dimensional layout designing step (S a three-dimensional structure determination step (S a three-dimensional analysis step (S a two-dimensional analysis step (S a layout correction step (S