Patent ID: 7227228

Claim:
A semiconductor device, comprising: an insulator disposed on a substrate; a silicon-on-insulator device disposed on said insulator; said silicon-on-insulator device including a silicon layer having a source region, a channel region and a drain region, an insulating film disposed on said silicon layer and a gate disposed on said insulating film; a sidewall insulating film having two first sidewall insulating layers opposite to each other and two second sidewall insulating layers opposite to each other, said two first sidewall insulating layers being parallel to a direction from said source region to said drain region, said two first sidewall insulating layers being disposed on side surfaces of said silicon layer, said insulating film and said gate, said two second sidewall insulating layers being perpendicular to the direction from said source region to said drain region, and said two second sidewall insulating layers being disposed on said side surfaces of said insulating film and said gate, and a dielectric film disposed on said insulator adjacent to said silicon-on-insulator device and said sidewall insulating film and said silicon-on-insulator device.