Patent ID: 8936680
Filing Date: 2015-01-20
Classification: C30B,H01L,Y10T

Abstract:
1. A crucible for producing single-crystal silicon carbide, comprising: a crucible vessel and a crucible cover, wherein the crucible cover is configured for the attachment of a seed crystal to the crucible cover; and the crucible vessel is configured to hold a silicon carbide raw material in the crucible vessel and sublimate the silicon carbide raw material to supply silicon carbide sublimation gas onto a seed crystal attached to the crucible cover, thereby growing single-crystal silicon carbide on the seed crystal, and wherein the crucible vessel and the crucible cover each comprise threaded portions, configured to screw the crucible vessel and the crucible cover together, the threaded portion of the crucible vessel and/or the crucible cover comprising a sublimation gas discharge groove or grooves configured to regulate the sublimation gas flow rate by relative rotation of the threaded portions, wherein the sublimation gas discharge groove or grooves in the threaded portion of the crucible vessel and/or crucible cover have an opening area, and comprise a groove outlet side and a groove inlet side, wherein the opening area changes from the groove outlet side to the groove inlet side.