Patent ID: 9017804
Filing Date: 2015-04-28
Classification: C30B,Y10T

Abstract:
1. An SiC crystal ingot comprising: a seed crystal; a plurality of deposited layers formed over the seed crystal by physical vapor transport, each of the deposited layers having an average dopant concentration that is different from a layer directly below it or a layer directly above it; and a bulk layer deposited over the plurality of deposited layers by physical vapor transport, the bulk layer having a thickness of more than 0.1 mm and configured to be sliced into wafers; wherein the bulk layer has dopant concentration from 1×10 wherein the plurality of deposited layers alternate between low doping and high doping, such that a low doped layer is grown over a high doped layer and a high doped layer is grown over a low doped layer; and, wherein the seed crystal, the plurality of deposited layers, and the bulk layer together form a single SiC crystal ingot.