Patent ID: 7510973

Claim:
A method for forming a fine pattern in a semiconductor device, the method comprising: providing a semiconductor substrate; forming a target layer over the semiconductor substrate, and forming a hard mask layer over the target layer; forming a first oxide film pattern over the hard mask layer, and forming a nitride film pattern over the first oxide film pattern, thereby selectively exposing a portion of the hard mask layer; forming a first polysilicon layer having a first thickness over the exposed portion of the hard mask layer, the first oxide film pattern, and the nitride film pattern; forming a second oxide film having a second thickness over the first polysilicon layer; forming a second polysilicon layer having a third thickness over the second oxide film; planarizing the second polysilicon layer, the second oxide film, and the first polysilicon layer until the nitride film pattern is exposed; removing the nitride film pattern to expose the first oxide film pattern; etching the first oxide film pattern and the second oxide film according to an etching selectivity between an oxide material and a polysilicon material; etching the hard mask layer by using top portions of the first polysilicon layer and the second polysilicon layer as an etching mask to form a hard mask layer pattern; and etching the target layer by using the hard mask layer pattern as an etching mask to form the fine pattern.