Patent ID: 6686108
Filing Date: 2004-02-03
Classification: G03F,Y10S

Abstract:
Method for manufacturing a semiconductor IC device, comprising the steps of:(a) depositing a photoresist over a semiconductor wafer so as to form a photoresist film; and (b) transferring an integrated circuit pattern over a photomask to the semiconductor wafer by irradiating the photoresist film over said semiconductor wafer with an off-axis illumination through an optical reduction projection system, wherein said photomask comprises: (i) a mask substrate; (ii) a halftone film over a main surface of the mask substrate; (iii) a plurality of main apertures in the halftone film to transfer the integrated circuit pattern corresponding to a plurality of hole patterns having substantially a same size over the wafer; and (iv) a plurality of auxiliary apertures in the halftone film not resolved over said semiconductor wafer, wherein said main apertures and said auxiliary apertures are disposed periodically as a whole.