Patent ID: 6984844
Filing Date: 2006-01-10
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer; a gate insulator provided on the semiconductor layer; a gate electrode provided on the gate insulator; a source region and a drain region, which are of a first conductivity type and are provided in the semiconductor layer on both sides of the gate electrode in plan view; a cap layer, a channel region, and an under-channel region which are provided in the semiconductor layer between the source region and the drain region in a descending order from an interface with the gate insulator the under-channel region being of a second conductivity type; and a bias electrode member for applying a voltage to the under-channel region, wherein the channel region is formed of a first semiconductor, the cap layer and the under-channel region are formed of a second semiconductor and a third semiconductor, respectively, each of which has a larger band gap than the first semiconductor, the bias electrode member is capable of applying the voltage independently of the gate electrode.