Patent ID: 6656646
Filing Date: 2003-12-02
Classification: G03F

Abstract:
A method of fabricating a semiconductor integrated circuit device, comprising the steps of:(a) providing a first photomask having a first light-shielding film having a first thickness, said first light-shielding film having first light-transmitting portions and first light-shielding portions arranged to produce a first predetermined projected exposure pattern corresponding to an integrated circuit, said first light-shielding portions having first transverse dimensions; (b) making a projection exposure through said first photomask onto a first photosensitive substrate; (c) providing a second photomask having a second light-shielding film having a second thickness different from said first thickness, said second light-shielding film having second light-transmitting portions and second light-shielding portions arranged to produce a second predetermined projected exposure pattern corresponding to said integrated circuit, said second light-shielding portions having second transverse dimensions different from said first transverse dimensions; and (d) making a projection exposure through said second photomask onto a second photosensitive substrate; wherein said second transverse dimensions are selected such that said second photomask produces essentially the same projection exposure pattern as said first photomask.