Patent ID: 6121633
Filing Date: 2000-09-19
Classification: H01L

Abstract:
A MOS bipolar transistor comprising:a silicon carbide npn bipolar transistor on a bulk single crystal n-type silicon carbide substrate and having an n-type drift layer and an epitaxial p-type base layer formed as a mesa on said n-type drift layer;a silicon carbide nMOSFET in said n-type drift layer including spaced apart n-type source and drain regions with a gate region therebetween and adjacent said npn bipolar transistor so as to provide base current to said npn bipolar transistor when said bipolar transistor is in a conductive state;means for converting electron current flowing between said source and said drain into hole current for injection into said p-type base layer; andmeans for reducing field crowding associated with an insulating layer of said nMOSFET.