Patent ID: 7785969

Claim:
A method for forming a semiconductor device, comprising the steps of: forming a first dielectric film over a semiconductor substrate; forming a nitride film layer over the first dielectric film; forming, over the nitride film layer, a first photoresist pattern defining an active region equal to or smaller in size than an active region formed from conventional techniques by designated dimensions; etching the nitride film layer, the first dielectric film, and the semiconductor substrate using the first photoresist pattern as a mask, thereby forming a trench; removing the first photoresist pattern, and wet etching the surface of the etched nitride film layer to a designated thickness to form a nitride film pattern smaller in size than the active region by designated dimensions; etching the first dielectric film by using the nitride film pattern as a mask, forming an isolation dielectric film over an entire surface of the semiconductor substrate having the trench; etching the isolation dielectric film to lower a height of the same, and removing the nitride film pattern and the first dielectric film; forming a second dielectric film in a region with the first dielectric film removed therefrom; forming a second hard mask pattern on an entire surface of the semiconductor substrate; forming, over the second hard mask pattern, a second photoresist pattern exposing a recess region across the active region with a gate region over the semiconductor substrate and the isolation dielectric film; etching the second hard mask pattern, the second dielectric film, the semiconductor substrate, and the isolation dielectric film using the second photoresist pattern as a mask, thereby forming a fin type active region, wherein a center portion of the fin type active region is etched in the recess region; removing the second photoresist pattern and the second hard mask pattern; etching the second dielectric film and the isolation dielectric film to expose the surface of the active region; forming a gate dielectric film over the exposed surface of the active region; and, forming a gate over the semiconductor region having the fin type active region and the recess region.