Patent ID: 8492772
Filing Date: 2013-07-23
Classification: C30B,H01L,Y10S

Abstract:
1. An SiC wafer produced according to a method comprising: growing SiC homoepitaxial layers on a surface of an SiC substrate, wherein the layers have a same polytype as the substrate, and wherein the surface is inclined relative to a (0001) basal plane at an angle higher than 0.1 degree but less than 1 degree; starting an homoepitaxial growth by forming a boundary layer with a thickness up to 1 μm; and forming a homoepitaxial device layer wherein the boundary layer is formed in an atmosphere of lower supersaturation than when forming the homoepitaxial device layer and at a C/Si ratio above 1, such that the homoepitaxial device layer has a density of surface defects that is less than 2 cm