Patent ID: 8313720
Filing Date: 2012-11-20
Classification: C30B

Abstract:
1. A SiC crystal boule growth method comprising: (a) providing a growth guide inside of a growth crucible that is charged with SiC source material at a bottom of the crucible and a SiC seed crystal at a top of the crucible, said growth guide having an inner layer that defines at least part of an opening in the growth guide and an outer layer supporting the inner layer in the crucible, said opening facing the source material with the seed crystal positioned at an end of the opening opposite the source material, wherein the inner layer is formed from a first material having a higher thermal conductivity than the material forming the outer layer which is formed from a second, different material; and (b) sublimation growing source material on the seed crystal in the growth crucible via the opening in the growth guide to thereby form a SiC crystal boule on the seed crystal, wherein: the inner layer is made from either isostatically molded graphite having less than 20 weight percent of binder or meso-phase graphite that contains no binder; and the outer layer is made from porous carbon.