Patent ID: 7202174

Claim:
A method of forming a micro pattern in a semiconductor device, comprising the steps of: (a) sequentially forming a first polysilicon film and a buffer oxide film over the first polysilicon film on a semiconductor substrate having a to-be-etched layer, and forming a hard mask having a structure in which a second polysilicon film, an anti-polishing film and a first oxide film are laminated on a predetermined region of the buffer oxide film; (b) forming nitride film spacers on lateral portions of the hard mask and forming a second oxide film on the entire structure; (c) polishing the second oxide film, the nitride film spacers, and the first oxide film to expose the anti-polishing film, and removing the anti-polishing film and the nitride film spacers; (d) etching the buffer oxide film using the second polysilicon film and the second oxide film as masks and removing the second oxide film; (e) etching the first polysilicon film using the second polysilicon film and the buffer oxide film as masks and removing the second polysilicon film; and (f) etching the to-be-etched layer using the buffer oxide film and the first polysilicon film as masks.