Patent ID: 7387867
Filing Date: 2008-06-17
Classification: G03F,H01L

Abstract:
1. A method for manufacturing a semiconductor integrated circuit device, comprising the steps of: (a) depositing a photo-resist film on a main surface of a wafer; and (b) transferring a desired pattern onto said photo-resist film by subjecting said wafer to a reduced projection exposure process using a mask; wherein said step (b) includes a step of exposing first and second transfer areas of said mask, which are overlaid one upon another in one region of said photo-resist film; wherein each of said first and second transfer areas has a half-tone film used as its background; wherein said half-tone film is opened in a pattern massed region of each of said first and second transfer areas to form a plurality of light transmission patterns to be disposed there; wherein a phase shifter is disposed in each of said plurality of light transmission patterns formed in the pattern massed region of each of said first and second transfer areas so that phase inversion occurs mutually between the phases of the lights that transmit adjacent light transmission patterns; wherein a solitary light transmission pattern is disposed in a sparse region of each of said first and second transfer areas, said solitary light transmission pattern being formed by opening said half-tone film such that an entire area, except for the solitary light transmission pattern, in the sparse region of each of the first and second transfer areas, is covered by said half-tone film; wherein both shape and size are the same among said light transmission patterns, which are disposed in the massed and sparse regions of said first and second transfer areas; and wherein said phase shifters in said pattern massed regions of said first and second transfer areas are disposed so that each phase shifter in said first transfer area is inverted in phase from its counterpart in said second transfer area.