Patent ID: 7812351

Claim:
A semiconductor device comprising: an insulating film over a substrate; a semiconductor layer over the insulating film, wherein the semiconductor layer comprises a source region, a drain region, an LDD region and a channel forming region, wherein the source region and the drain region comprise a metal silicide; a gate insulating film over the semiconductor layer; a first conductive layer comprising a polysilicon film formed over the gate insulating film; a second conductive layer comprising a metal silicide formed on the first conductive layer; and a side wall insulating film on a side surface of the first and second conductive layers, wherein the semiconductor layer includes columnar or needle-like crystals, wherein the semiconductor layer has a thickness within a range from 150 Å to 450 Å, wherein a height of asperities of the insulating film is less than 30 Å, wherein the gate insulating film is over the LDD region, and wherein the semiconductor device is a static random access memory.