Patent ID: 11905618
Assignee: II-VI ADVANCED MATERIALS, LLC
Field: Surface technology, coating (Chemistry)
Classification: CPC C  Y | IPC C

Claim 13:
14. A PVT growth apparatus for PVT growing an SiC single crystal comprising:
a growth crucible having a side, a top, and a bottom, and an aspect ratio of an outside diameter over a height between 1 and 4, the top of the growth crucible configured to support a single crystal SiC seed in an interior of the growth crucible;
insulation surrounding an exterior of the growth crucible, said insulation including side, top, and bottom insulation pieces positioned adjacent the respective side, top, and bottom of the growth crucible, the insulation further including an insulation insert positioned in an opening in the top insulation piece, wherein the insulation insert has a thickness less than a thickness of any one of the side, top, and bottom insulation pieces; and
heater positioned exclusively between a bottom of the growth crucible and the bottom insulation piece, wherein a geometry of the insulation insert is tuned to control heat flux in the SiC single crystal that grows on the single crystal SiC seed in use of the PVT growth apparatus.