Patent ID: 6548213
Filing Date: 2003-04-15
Classification: G03F,Y10S

Abstract:
A semiconductor integrated circuit device fabrication method, comprising the steps of:(a) exposing a mask to an exposure light beam having a predetermined wavelength, the mask comprising a transmission region substantially transparent with respect to the exposure light beam, with at least one phase-shifting region formed in a part of said transmission region, the transmission region having a phase non-reversing region and a phase reversing region for substantially reversing the phase of a transmitted light, without substantially attenuating the amplitude of the transmitted light, relative to the phase non-reversing region and bordering on the phase non-reversing region, one of the phase non-reversing region and the phase reversing region corresponding to the at least one phase-shifting region, whereby resolution is improved due to destructive interference between light beams from both vicinity sides of a boundary between the phase reversing region and the phase non-reversing region; and (b) focusing a clear image of a pattern, on the mask, onto a light sensitive resist film on a semiconductor wafer through an optical projection system.