Patent ID: 7800097
Filing Date: 2010-09-21
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type having, in an upper portion thereof, a plurality of polarity inversion regions spaced from one another and formed by introducing an impurity of a second conductivity type; and a plurality of semiconductor elements formed respectively on said polarity inversion regions, each of said plurality of semiconductor elements includes a buffer layer made of a nitride semiconductor, a channel layer made of a nitride semiconductor formed above said buffer layer, and source, drain and gate electrodes formed on said channel layer, wherein said buffer layers contact corresponding polarity inversion regions, said channel layers are spaced from each other, each of said polarity inversion regions forms a pn junction in said semiconductor substrate, said semiconductor elements are respectively formed on said semiconductor substrate in which said polarity inversion regions form the pn junction, and each of said polarity inversion regions overlaps at least a portion of each of a corresponding source, drain and gate electrode formed thereon.