Patent ID: 7635413
Filing Date: 2009-12-22
Classification: C30B,Y10T

Abstract:
1. A method for producing a silicon carbide single crystal comprising immersing a seed crystal on which SiC is to be grown by the solution growth method and which is attached to a seed shaft in a melt in a rotating crucible, the melt comprises Si and C and at least one metal element M and containing silicon carbide (SiC) dissolved therein, and allowing a SiC single crystal to grow on the seed crystal by creating a supersaturated SiC concentration in the melt at least in the periphery of the seed crystal, characterized in that the melt is stirred by periodically changing the rotational speed or the rotational speed and the rotational direction of the crystal, wherein M is at least one element selected from Ti, Mn, Fe, and Co, and when expressing the molar concentration of M in the melt as [M] and the molar concentration of Si as [Si], the value of [M]/([M]+[Si]) is, at least 0.1 and at most 0.25 when M is Ti; at least 0.1 and at most 0.7 when M is Mn: at least 0.2 and at most 0.7 when M is Fe; and at least 0.05 and at most 0.25 when M is Co.