Patent ID: 7135074

Claim:
A method for manufacturing a silicon carbide single crystal, the method comprising the steps of: preparing a dislocation control seed crystal including a screw dislocation generation region for generating a screw dislocation in the silicon carbide single crystal; and growing the silicon carbide single crystal on a growth surface of the dislocation control seed crystal, wherein the screw dislocation generation region occupies equal to or smaller than 50% of the growth surface of the dislocation control seed crystal, wherein the growth surface has an offset angle equal to or smaller than 60 degrees measured from a { 0001 } surface of the dislocation control seed crystal, wherein the screw dislocation in the silicon carbide single crystal generated from the screw dislocation generation region has a density higher than a density of the screw dislocation in the other region of the silicon carbide single crystal, wherein, in the step of growing the silicon carbide single crystal, the silicon carbide single crystal includes a flat C-surface facet disposed on a growing surface of the silicon carbide single crystal, and wherein the C-surface facet overlaps at least one of parts of the growing surface provided by projecting the screw dislocation generation region in a direction perpendicular to the growth surface and in a direction parallel to a < 0001 > axis of the dislocation control seed crystal, respectively.