Patent ID: 8758510
Filing Date: 2014-06-24
Classification: C30B,H01L,Y10T

Abstract:
1. A method for producing an SiC volume monocrystal by means of sublimation growth, which comprises the steps of: disposing an SiC seed crystal in a crystal growth region of a growth crucible before a beginning of growth; introducing a powdery SiC source material into an SiC storage region of the growth crucible; producing a SiC growth gas phase during a growth period by means of sublimation of the powdery SiC source material and by means of transport of sublimated gaseous components into the crystal growth region, the SiC volume monocrystal having a central center longitudinal axis grows by means of deposition from the SiC growth gas phase on the SiC seed crystal; bending the SiC seed crystal during a heating phase before the beginning of the growth period such that an SiC crystal structure with a non-homogeneous course of lattice planes is adjusted in the SiC seed crystal, the lattice planes at each point have an angle of inclination relative to a direction of the center longitudinal axis, and peripheral angles of inclination at a radial edge of the SiC seed crystal differ in terms of amount by at least 0.05° and by at most 0.2° from a central angle of inclination at a site of the central center longitudinal axis; and propagating the SiC crystal structure, of the SiC seed crystal, with the non-homogeneous course of the lattice planes during growth from the SiC seed crystal into the growing SiC volume monocrystal.