Patent ID: 6458497
Filing Date: 2002-10-01
Classification: G03F,Y10S

Abstract:
A fabrication method for semiconductor integrated circuit devices, comprising;(a) exposing a mask to an exposure light beam having a predetermined wavelength, the mask comprising: (i) transmission region substantially transparent with respect to the exposure light beam; (ii) a phase non-reversing region in said transmission region; (iii) a phase reversing region, in said transmission 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, wherein 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 an enlarged pattern over the mask onto a light sensitive resist film over a semiconductor wafer through an optical reduction projection system.