Patent ID: 6261363
Filing Date: 2001-07-17
Classification: C30B

Abstract:
A method of producing 4H polytype silicon carbide crystals, the method comprising the steps of:locating a silicon carbide source within a container, wherein an inner surface of said container is comprised of a Ta--Si--C compound;locating at least one 4H polytype seed crystal within said container, wherein a growing surface of said at least one seed crystal is substantially parallel to an evaporating surface of said silicon carbide source;introducing tin vapors into a growth zone defined by said silicon carbide source and said at least one 4H polytype seed crystal;sealing said container prior to initiating a sublimation process, wherein said sealed container is substantially vacuum tight; andheating said container, wherein an axial temperature gradient in a direction from said at least one seed crystal to said silicon carbide source is formed.