Patent ID: 7859021
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A field-effect semiconductor device comprising: (a) a main semiconductor region having a first semiconductor layer and a second semiconductor layer placed on the first semiconductor layer, the second semiconductor layer being greater in bandgap than the first semiconductor layer, the first semiconductor layer having a two-dimensional carrier as layer of a first conductivity type, the main semiconductor region having a first and a second opposite major surface, the second semiconductor layer being disposed between the first major surface of the main semiconductor region and the first semiconductor layer; (b) a first and a second main electrode disposed in spaced-apart positions on the first major surface of the main semiconductor region and electrically coupled to the two-dimensional carrier gas layer in the first semiconductor layer of the main semiconductor region; (c) a gate electrode disposed between, and spaced from, the first and the second main electrode on the first major surface of the main semiconductor region for controlling conduction between the first and the second main electrode via the two-dimensional carrier gas layer; and (d) a metal oxide semiconductor film disposed between the gate electrode and the main semiconductor region, and having a second conductivity type opposite to the first conductivity type.