Patent ID: 6737677
Filing Date: 2004-05-18
Classification: H01L

Abstract:
A wide bandgap semiconductor device comprising:a drift layer of a first conductivity type made of a wide bandgap semiconductor material; a body region of a second conductivity type opposite to the first conductivity type made of the wide bandgap semiconductor material, disposed at the top surface of and in the drift layer; a source region of the first conductivity type made of the wide bandgap semiconductor material, disposed at the top surface of and in the body region; a channel layer of the first conductivity type made of the wide bandgap semiconductor material, disposed at the top surface of and in the body region neighboring to the source region and further disposed at the top surface of and in the drift layer; and a gate electrode including semiconductor layer at the bottom so that the semiconductor layer directly contact with the top surface of the channel layer, the semiconductor layer made of a semiconductor material having a different bandgap energy from that of the wide bandgap semiconductor material.