Patent ID: 7544249
Filing Date: 2009-06-09
Classification: C30B,H01L

Abstract:
1. A manufacturing method of a large-diameter SiC wafer comprising the steps of: placing a small diameter α-SiC single crystal wafer on a graphite plate; forming a film of polycrystal SiC around an outer circumference of said wafer by depositing polycrystal SiC over the graphite plate and over a surface of the α-SiC single crystal wafer; grinding the polycrystal SiC on the surface of the α-SiC single crystal wafer to manufacture an increased-diameter SiC of a double structure in which the polycrystal SiC plate portion is planarly formed around an outer circumference of the small-diameter a-SiC single crystal wafer; and wherein a top and bottom surface of the small diameter α-SiC single crystal wafer is free of the polycrystal SiC.