Patent ID: 7517755

Claim:
A method for fabricating a semiconductor device, the method comprising: (a) forming a gate structure comprising a stacked structure of a gate electrode and a gate hard mask layer over a semiconductor substrate having a device isolation structure; (b) forming an insulating film filling up the gate structure; (c) selectively etching a predetermined region of the insulating film to expose the semiconductor substrate in a bit line contact region, wherein step (c) comprises: (c-1) planarizing the insulating film until the gate hard mask layer is exposed, (c-2) forming a photoresist film pattern over the insulating film and the gate hard mask layer to define the bit line contact region, (c-3) etching the insulating film using the photoresist film pattern as an etching mask to expose the semiconductor substrate in the bit line contact region, wherein the insulating film is completely removed from the bit line contact region, and (c-4) removing the photoresist film pattern; (d) subjecting the exposed semiconductor substrate to a C-HALO ion implantation process; and (e) removing the insulating film.