Patent ID: 7368226

Claim:
A method for forming fine patterns of a semiconductor device, comprising the steps of: forming an lower layer to be etched over a semiconductor substrate; forming a first photoresist file pattern having a width of two line patterns and one space pattern on the lower layer; etching the lower layer using the first photoresist film pattern as an etching mask until the semiconductor substrate is exposed to form a first lower layer pattern; subjecting the exposed semiconductor substrate to a C-HALO implant process to form an ion-implanted region; removing the first photoresist film pattern on the first lower layer pattern; patterning a second photoresist film pattern, the second photoresist pattern having a substantially same size as the first photoresist film pattern and shifted from the first photoresist pattern by a distance corresponding to one line pattern and one space pattern; and etching the first lower layer pattern using the second photoresist film pattern as an etching mask until the semiconductor substrate is exposed to form a second lower layer pattern.