Patent ID: 8304174

Claim:
A method for fabricating a semiconductor device, the method comprising: forming a first mask pattern on an etch target layer; forming a TEOS film over the etch target layer and the first mask pattern; forming a hard mask over the TEOS film, the hard mask including a polysilicon; forming a second Anti-Reflection film over the hard mask; patterning a second photo-resist film formed on the second Anti-Reflection film; etching the second Anti-Reflection film, the hard mask, and the TEOS film by using the patterned second photo-resist film as a mask, the etched TEOS film forming a second mask pattern; forming a first spacer at a sidewall of the first mask pattern and a second spacer at a sidewall of the second mask pattern; removing the second mask pattern; and etching the etch target layer by using the first mask pattern, the first spacer, and the second spacer as an etching mask.