Patent ID: 7145169

Claim:
A field-effect transistor comprising: a silicon layer formed on an insulating film; a first-conductivity-type base layer formed in said silicon layer; a second-conductivity-type source layer formed in said silicon layer so as to be adjacent to said first-conductivity-type base layer; a second-conductivity-type drain layer formed in said silicon layer so as to be separated from said second-conductivity-type source layer with said first-conductivity-type base layer being interposed therebetween; a gate-to drain offset layer formed between said first-conductivity-type base layer and said second-conductivity-type drain layer in said silicon layer, and having a resistance higher than that of said first-conductivity-type base layer; and a gate electrode formed on at least a surface of said first-conductivity-type base layer via a gate insulating film, wherein said silicon layer in which said first-conductivity-type base layer is formed is a strained silicon layer.