Patent ID: 9644286
Date: 2017-05-09
CPC Classifications: C30B

Claim:
1. A silicon carbide single crystal manufacturing apparatus comprising: a vacuum chamber; a pedestal on which a seed crystal made of a silicon carbide single crystal substrate is disposed, the pedestal disposed in the vacuum chamber; an inlet disposed on a bottom surface of the vacuum chamber and introducing source gas of silicon carbide from below the seed crystal; a reaction chamber extending from the bottom surface of the vacuum chamber toward the pedestal in the vacuum chamber, the reaction chamber including a cylindrical member having a hollow portion through which the source gas passes, the reaction chamber decomposing the source gas by heating and supplying the decomposed source gas toward the seed crystal; a first heating device disposed around an outer periphery of the reaction chamber and heating the reaction chamber; a second heating device disposed around an outer periphery of the pedestal and keeping a high temperature of a growth surface of a silicon carbide single crystal grown on a surface of the seed crystal; an outlet disposed outside the first and second heating devices in the vacuum chamber and discharging unreacted gas in the source gas; and a guide surrounding the pedestal, disposed at a predetermined distance apart from the pedestal, and disposed at a predetermined distance apart from an upper end of the reaction chamber adjacent to the pedestal, wherein: the second heating device is disposed around an outer periphery of the guide, an end portion of the reaction chamber adjacent to the pedestal has a flange shape, an end portion of the guide adjacent to the reaction chamber has a flange shape, the upper end of the reaction chamber is located below the growth surface of the silicon carbide single crystal with a clearance, and after the source gas supplied from the reaction chamber is supplied toward the pedestal, the source gas is let flow outward in a radial direction of the silicon carbide single crystal through the clearance between the upper end of the reaction chamber and the growth surface of the silicon carbide single crystal and a clearance between the reaction chamber and the guide, is let flow outside the first and second heating devices in the vacuum chamber, and is discharged through the outlet.