Patent ID: 8860040

Claim:
A high voltage semiconductor device comprising: a single crystal, 4° off-axis 4H-SiC substrate tilted away from the c-axis toward the <11-20> direction, having an area of 0.02 to 1.5 cm 2 having: a micropipe density of less than 1/cm 2 , a screw dislocation density of less than 2000/cm 2 , and a basal plane dislocation density of less than 2000/cm 2 ; and a plurality of epitaxial layers over the substrate, wherein at least one of the plurality of epitaxial layers has: a net carrier concentration in the range from 1×10 14 /cm 3 to 2×10 16 /cm 3 , a micropipe density of less than 1/cm 2 , a screw dislocation density of less than 2000/cm 2 , and a basal plane dislocation density of less than 10/cm 2 .