Patent ID: 7745339

Claim:
A method for forming a pattern of a semiconductor device, the method comprising: forming a first hard mask pattern having a first width and a first thickness over an underlying layer formed over a semiconductor substrate; forming a second hard mask film over the first mask pattern; removing the second hard mask film at least until the first hard mask pattern is exposed; removing an upper portion of the exposed first hard mask pattern, so that an upper surface of the resulting first hard mask pattern is provided to be lower than an upper surface of the second hard mask film; performing a first trimming process on the second hard mask film to form a second hard mask pattern having a sloped sidewall; performing a second trimming process on the second hard mask pattern to convert the second hard mask pattern into a third hard mask pattern having a second width, the first and third hard mask patterns together exposing portions of the underlying layer; and patterning the underlying layer using the first and third hard mask patterns as etching masks.