Patent ID: 7414268

Claim:
A high voltage silicon carbide (SiC) device, comprising: a SiC insulated gate bipolar transistor (IGBT) comprising a voltage blocking substrate as a drift region of the IGBT; a planar edge termination structure at a first surface of the voltage blocking substrate and surrounding an active region of the IGBT; a beveled edge termination structure extending through a second surface of the voltage blocking substrate opposite the first surface of the voltage blocking substrate, wherein the voltage blocking substrate is a boule grown substrate; and an epitaxial silicon carbide layer formed on the second surface of the voltage blocking substrate, wherein the planar edge termination structure includes a plurality of floating guard rings; wherein the epitaxial silicon carbide layer has a conductivity type opposite to a conductivity type of the voltage blocking substrate; and wherein the voltage blocking substrate includes an upper portion having a substantially vertical edge and a lower portion having a beveled edge extending to a bottom surface of the epitaxial silicon carbide layer, so as to form the beveled edge termination structure.