Patent ID: 8293623
Filing Date: 2012-10-23
Classification: C23C,C30B,H01L

Abstract:
1. A method of manufacture of an epitaxial SiC single crystal substrate, which includes a SiC single crystal wafer and a SiC epitaxial film formed on the main surface of a SiC single crystal wafer by epitaxial growth, comprising: preparing a SiC single crystal wafer whose main surface is a c-plane or whose main surface is a surface which inclines a c-plane with an angle of inclination of more than 0 degrees but less than 10 degrees; forming SiC epitaxial film by epitaxially grown on the main surface of the SiC single crystal wafer with adjustment of a temperature difference between the central part of the wafer and the periphery of the wafer during epitaxial growth to 0.1° C. or more and 100° C. or less, and with adjustment of a temperature distribution of the SiC single crystal wafer during epitaxial growth so that there is a positive temperature distribution from the central part of the SiC single crystal wafer toward the periphery of the SiC single crystal wafer; and obtaining an epitaxial SiC single crystal substrate in which a dislocation array density of threading edge dislocation arrays is 10 arrays/cm