Patent ID: 7972704
Filing Date: 2011-07-05
Classification: C30B,H01L,Y10T

Abstract:
1. A single-crystal silicon carbide ingot comprising single-crystal silicon carbide which contains donor-type impurity at a concentration of 2×10 18 cm −3 to 6×10 20 cm −3 and acceptor-type impurity at a concentration of 1×10 18 cm −3 to 1.5×10 19 cm −3 and wherein the concentration of the donor-type impurity is greater than the concentration of the acceptor-type impurity and the difference is 1×10 18 cm −3 to 5.99×10 20 cm −3 , said single-crystal silicon carbide ingot characterized in that the etch pit density caused by basal plane dislocations measured on a single-crystal silicon carbide substrate cut from the ingot at an off-angle of 8° from the (0001) Si plane and polished is 1×10 4 cm −2 or less.