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

Claim 1:
2. A method for producing the SiC epitaxial wafer according to claim 1 in which a SiC epitaxial layer is formed on a 4H-SiC single crystal substrate having an off angle and a substrate carbon inclusion density of 0.1 to 6.0 inclusions/cm2, the method comprising:
an epitaxial growth step of growing an epitaxial layer on the SiC single crystal substrate; and
a selecting step of selecting a SiC epitaxial wafer which has a total density of large pit defects and triangular defects of 0.01 defects/cm2 or more and 0.6 defects/cm2 or less caused by substrate carbon inclusions and contained in the SiC epitaxial layer,
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 in the epitaxial growth step, a growth rate is set from 5 to 100 μm/hour, a growth temperature is set to 1,500° C. or higher, and a C/Si ratio is set to 1.25 or less, 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.