Patent ID: 9691607
Date: 2017-06-27
CPC Classifications: C30B,H01L

Claim:
1. An epitaxial silicon carbide single crystal substrate, which is an epitaxial silicon carbide single crystal substrate which has been obtained by a process for producing an epitaxial silicon carbide single crystal substrate, comprising forming a silicon carbide film through epitaxial growth on a silicon carbide single crystal substrate having an off-angle of 2° or more and 6° or less by a chemical vapor deposition process, wherein a crystal growth step of epitaxially growing the silicon carbide film on the substrate includes a crystal growth sub-step involving a temperature switching operation of changing a growth temperature up or down between a lower preset temperature T wherein the basal plane dislocation density of the silicon carbide film is 20 dislocations/cm wherein a film thickness of the silicon carbide film grown in the crystal growth sub-step is 0.2 μm or more and 1.0 μm or less, wherein the basal plane dislocation carried over from the silicon carbide single crystal substrate is converted into an edge dislocation in the silicon carbide film grown in the crystal growth sub-step, and wherein the basal plane dislocation density of the silicon carbide film is no more than 0.3% of an edge dislocation density of the silicon carbide film.