Patent ID: 6657257
Filing Date: 2003-12-02
Classification: H01L

Abstract:
An insulated gate field effect transistor, comprising:an SOI (Silicon On Insulator) substrate providing a first conductivity type device formation area; a source electrode formed in the SOI substrate; a couple of semiconductor layers of the first conductivity type and a second conductivity type contacted to the source electrode; a gate insulating film and a gate electrode contacted to the first conductivity type semiconductor layer; a field insulating film contacted to the gate electrode; a drain electrode disposed at a lateral position with respect to the gate electrode through the field insulating film; a first conductivity type semiconductor layer contacted to the drain electrode; and, a second conductivity type semiconductor region (body layer) contacted to the gate insulating film and the couple of semiconductor layers of the first and the second conductivity type contacted to the source electrode, wherein the SOI substrate providing the device formation area has a first conductivity type semiconductor region, which has an impurity concentration higher than the impurity concentration of the device formation area, formed so that the first conductivity type semiconductor region is contacted to a part of the gate insulating film and the field insulating film formed between the source electrode and the drain electrode, and extends to be contacted to the first conductivity type semiconductor layer contacted to the drain electrode; and wherein the first conductivity type semiconductor layer contacted to the drain electrode is further contacted to the first conductivity type device formation area.