Patent ID: 8158528

Claim:
A method for forming a pattern of a semiconductor device, the method comprising: forming a stacked film including an underlying layer, an antireflective film and a photoresist film over a substrate; forming an over-coating film over the photoresist film; patterning the photoresist film and the over-coating film to form a stack pattern of a photoresist pattern and an over-coating film pattern, the stack pattern exposing portions of the antireflective film; forming a silicon-containing-RELACS layer over the antireflective film and the stack pattern; removing the over-coating film and a portion of the-silicon-containing-RELACS layer to form a spacer, the spacer being a portion of the silicon-containing-RELACS layer remaining at sidewalls of the photoresist pattern; removing the photoresist pattern; and etching the antireflective film and the underlying layer using the spacer as a mask to form an antireflection pattern and an underlying pattern.