Patent ID: 8940614
Filing Date: 2015-01-27
Classification: C23C,C30B,H01L

Abstract:
1. A method of manufacturing a 4H-SiC epiwafer comprising an epitaxial SiC film on a single-crystal 4H-SiC substrate, the method comprising: a. loading the single-crystal 4H-SiC substrate onto a susceptor in a reaction cell of a warm wall CVD system; b. heating the system by controlling a temperature of the susceptor in the reaction cell to a range from 1500° C. to 1620° C. while establishing a temperature gradient from a surface of the epiwafer to a ceiling of the reaction cell in a range from 25° C./cm to 80° C./cm; and c. executing a manufacturing run to produce the 4H-SiC epiwafer, the manufacturing run comprising supplying a gas flow parallel to a surface of the single-crystal 4H-SiC substrate, such that a total gas velocity is in a range from 120 to 250 cm/sec and controlling a pressure inside the reaction cell to a range from 100 to 150 mbar, wherein the gas flow comprises a mixture of hydrogen gas, silicon gas, and carbon gas, in order to produce the epitaxial SiC film on the single-crystal 4H-SiC substrate.