Patent ID: 8643106
Filing Date: 2014-02-04
Classification: H01L

Abstract:
1. A semiconductor device comprising: a supporting base substrate, a buried insulating layer formed on the supporting base substrate, a semiconductor region formed on the buried insulating layer, at least a part of the semiconductor region serving as a channel region, a gate insulating film formed on the channel region, and a gate electrode formed on the gate insulating film, wherein a threshold value is specified by adjusting a thickness of the buried insulating layer and an impurity concentration of the semiconductor region, and the threshold value is further adjusted by an impurity concentration of the supporting base substrate when the buried insulating layer has a thickness not greater than 20 nm, wherein the supporting base substrate and the semiconductor region are made of silicons having opposite conductivity types to each other, wherein the semiconductor device is of a normally-off type, wherein the supporting base substrate has a single conductivity type.