Patent ID: 7476594

Claim:
A method of fabricating a silicon nitride region in silicon carbide, the method comprising: implanting nitrogen ions selected from the group consisting of atomic nitrogen ions and molecular nitrogen ions at a dose of between about 5×10 17 and 4×10 18 ions per square centimeter at an energy of between about 50 and 300 keV into a silicon carbide layer; while maintaining the silicon carbide layer at a temperature between about 350° C. and 1000° C. to prevent or moderate implant damage to the silicon carbide crystal to form an as-implanted region of silicon nitride in the silicon carbide layer; and thereafter annealing the as-implanted region at a temperature less than a temperature that would produce undesired effects on the silicon carbide crystal and for a time sufficient to form a silicon nitride composition insulating region in the silicon carbide layer with a thickness sufficient to reduce capacitive coupling of devices and circuits formed in the surface layer with the underlying silicon carbide layer.