Patent ID: 10048142

Abstract:
Provided are a method by which the degrees of the strains of lattices in a plurality of bulk SiC single crystals can be relatively evaluated, and a reference SiC single crystal to be used in the method. Specifically provided are an evaluation method for bulk-shaped silicon carbide single crystals, including: measuring a Raman shift Rref of a reference silicon carbide single crystal to be used as a standard; measuring respective Raman shifts Rn of a plurality of bulk-shaped silicon carbide single crystals serving as objects to be evaluated; determining differences between each of the Raman shifts Rn and the Raman shift Rref; and relatively comparing the differences, to thereby relatively evaluate magnitudes of strains of lattices in the plurality of bulk-shaped silicon carbide single crystals serving as objects to be evaluated, and a reference silicon carbide single crystal to be used in the method, having a size of 5 mm square or more and 50 mm square or less and a thickness of 100 μm or more and 2,000 μm or less, having a surface roughness Ra of 1 nm or less, and having a micropipe density of 1.0/cm2 or less and a dislocation density of 5×103/cm2 or less.