Patent ID: 6576929
Filing Date: 2003-06-10
Classification: H01L

Abstract:
A silicon carbide semiconductor device comprising:a semiconductor substrate of a first conductance type consisting of silicon carbide; a semiconductor layer of the first conductance type consisting of silicon carbide of a higher resistance than the semiconductor substrate and formed on a main surface of the semiconductor substrate; first gate areas of a second conductance type formed on both sides of a prescribed area in a surface part, which is to become a channel, of the semiconductor layer; a channel layer of the first conductance type formed on the first gate areas and the semiconductor layer; second gate areas of the second conductance type formed in isolation from the first gate areas in the channel layer; a high impurity concentration area or a plurality of high impurity concentration areas of the first conductance type formed in the channel layer; source area of the first conductance type formed above the first gate areas in the channel layer; a third gate area of the second conductance type formed above the channel layer or in the surface part of the channel layer and having parts facing the second gate areas; source electrodes electrically connected to the first gate areas and the source areas; a gate electrode electrically connected to the third gate area; and a drain electrode formed on a backside of the semiconductor substrate.