Patent ID: 9617655
Date: 2017-04-11
CPC Classifications: C30B,Y10T

Claim:
1. A method for manufacturing a SiC single crystal, comprising steps of: providing a manufacturing apparatus comprising: a crucible including a tubular side wall made up of graphite and having a side wall thickness of 5 mm to 25 mm, and a bottom wall disposed at a lower end of the tubular side wall, the crucible housing a SiC solution; a chamber housing the crucible; a vertical seed shaft, a SiC seed crystal attached to a lower end surface of the seed shaft; and an induction heating unit disposed around the tubular side wall of the crucible in the chamber; bringing the SiC seed crystal attached to the seed shaft into contact with the SiC solution in the crucible; controlling the induction heating unit such that a frequency f (Hz) of alternating current to be passed to the induction heating unit satisfies Formula (1), where D1 (mm) indicates a permeation depth of electromagnetic waves into the tubular side wall by the induction heating unit, D2 (mm) indicates a permeation depth of electromagnetic waves into the SiC solution by the induction heating unit, T (mm) indicates the thickness of the tubular side wall, and R (mm) indicates an inner radius of the crucible; and growing the SiC single crystal on the SiC seed crystal while rotating the seed shaft: where, D1 is defined by Formula (2), and D2 is defined by Formula (3): where, σc is an electric conductivity (S/m) of the tubular side wall, and σs is an electric conductivity (S/m) of the SiC solution; μc is a relative permeability (dimensionless quantity) of the tubular side wall, and μs is a relative permeability (dimensionless quantity) of the SiC solution.