Patent ID: 7754589

Claim:
A method for improving the quality of an SiC crystal by eliminating or reducing carrier trapping centers in as-grown SiC crystal layer comprising the steps of: (a) carrying out ion implantation of carbon atoms, silicon atoms, hydrogen atoms, or helium atoms into a shallow surface layer of the SiC crystal layer to introduce carbon interstitials into the surface layer, wherein carrying out implantation further comprises selecting a dose of atoms in such a manner that a concentration of the introduced carbon interstitials exceeds that of electrically active point defects in the grown layer produced in step (b), and (b) growing the SiC layer upward from the edge face of the surface layer into which the carbon interstitials have been introduced, and diffusing out the carbon interstitials that have been introduced into the surface layer from the surface layer into the grown layer and combining the carbon interstitials and point defects to make the electrically active point defects in the grown layer inactive.