Patent ID: 9099377
Filing Date: 2015-08-04
Classification: C30B,H01L,Y10T

Abstract:
1. A method of growing a single-crystal of silicon carbide (SiC crystal) in the nominal c-axis growth direction using a physical vapor transport (PVT) process in a sublimation system, the method comprising: attaching a seed material to a seed holder and forming a uniform thermal contact between the seed material and seed holder; placing a source material and the seed material attached to the seed holder in a reaction crucible, wherein constituent components of the sublimation system including at least the source material, the seed holder, and the reaction crucible are substantially free from unintentional impurities; and controlling growth temperature, growth pressure, SiC sublimation flux and composition, and a temperature gradient between the source material and the seed material or the SiC crystal growing on the seed material during the PVT process to eliminate micropipe-inducing process instabilities and grow the SiC crystal on the seed material, wherein the SiC sublimation flux is controlled by ramping up the growth temperature in the range of from about 0.3 to 10° C./hr, wherein the single crystal of silicon carbide (SiC crystal) has a micropipe density of zero.