Patent ID: 6767783
Filing Date: 2004-07-27
Classification: H01L

Abstract:
A method of making a silicon carbide bipolar junction transistor comprising a SiC semiconductor substrate layer of a first conductivity type, a SiC drift layer of the first conductivity type disposed on the substrate layer, a SiC base layer of a second conductivity type different than the first conductivity type disposed on the drift layer, and one or more SiC emitter regions of the first conductivity type disposed on the base layer, the method comprising:forming a SiC emitter layer on the base layer, wherein the base layer is disposed on the drift layer and wherein the drift layer is disposed on the substrate layer; positioning a mask on the emitter layer; selectively etching the emitter layer through openings in the mask to form raised emitter regions separated by etched regions; and selectively forming SiC base contact regions in the etched regions through the openings in the mask.