Patent ID: 6207328
Filing Date: 2001-03-27
Classification: G03F

Abstract:
A method of forming a phase shift mask on a mask substrate comprising:sequentially forming a phase shifter layer and a shield layer on the mask substrate;forming a photo-resist layer on a predetermined region of the shield layer, the periphery of the photo-resist layer comprising at least one vertical side-wall;forming a deposition layer uniformly on the photo-resist layer and the shield layer surrounding the photo-resist layer;silylanizing the deposition layer;performing an anisotropic etching process to remove the deposition layer on top of the photo-resist layer and the shield layer surrounding the photo-resist layer, and to partially remove the deposition layer covered on the vertical side-wall of the photo-resist layer so as to form a spacer on the vertical side wall of the photo-resist layer;vertically removing the shield layer and the phase shifter layer not covered by the photo-resist layer and the spacer, and vertically removing the spacer and the shield layer under the spacer; andremoving the photo-resist layer completely to complete the phase shift mask.