Patent ID: 11961736
Assignee: RESONAC CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  C  G | IPC C  G  H

Claim 0:
1. A SiC epitaxial wafer comprising a SiC epitaxial layer formed on a 4H-SiC single crystal substrate,
wherein the 4H-SiC single crystal substrate has an off angle and a substrate carbon inclusion density of 0.1 to 6.0 inclusions/cm2,
wherein a total density of large pit defects and triangular defects caused by substrate carbon inclusions and contained in the SiC epitaxial layer is 0.01 defects/cm2 or more and 0.6 defects/cm2 or less,
wherein the large pit defect is a pit located on a surface at a position corresponding to a position of the carbon inclusion on the substrate surface,
wherein a size of the large pit defect is 100 to 500 μm2, and
wherein the conversion rate from the substrate carbon inclusions to the large pit defects and the triangular defects caused by the substrate carbon inclusions is 20% or less.