Patent ID: 7501022
Filing Date: 2009-03-10
Classification: C30B,Y10S

Abstract:
1. A method of producing a silicon carbide boule having a substantially single polytype, the method comprising: forcing preferential nucleation sites on a surface of a silicon carbide seed crystal having the substantially single polytype to a predefined pattern; and growing the silicon carbide boule utilizing physical vapor transport (PVT) so as to provide selective preferential growth of silicon carbide on the silicon carbide seed crystal corresponding to the predefined pattern; wherein forcing preferential nucleation sites comprises forming a pattern on the surface of the seed crystal so as to provide first regions of the seed crystal which extend beyond second regions of the seed crystal; and wherein forming a pattern comprises forming a pattern of vertical sidewalls in the exposed surface of the seed crystal wherein the vertical sidewalls are perpendicular to the surface of the silicon carbide seed crystal; and wherein growing the silicon carbide boule comprises preferentially growing silicon carbide from the vertical sidewalls.