Patent ID: 8097509

Claim:
A method for manufacturing a semiconductor device with a recessed channel, the method comprising: forming a mask pattern on a semiconductor substrate defining an active region, said active region comprising a channel region and a junction region, the mask pattern blocking the junction region and exposing the channel region, said mask pattern defining inner sidewalls; forming a spacer covering the inner sidewalls of the mask pattern; forming a bottom trench within the semiconductor substrate, using the spacer as an etch mask; forming a hard mask pattern exposing the bottom trench and the spacer; etching the exposed spacer using the hard mask pattern as a mask; forming a protrusion in a dual fin configuration comprising a first protrusion exposed through using the hard mask pattern as a mask to etch the isolation layer, a second protrusion, and a bottom surface connecting the first protrusion and the second protrusion; forming a recessed trench comprising the bottom trench and a top trench, comprising etching the bottom trench using the hard mask pattern as a mask to form the top trench wider than the bottom trench; and forming a gate stack filling the recessed trench.