Patent ID: 9214336
Filing Date: 2015-12-15
Classification: C23C,H01L

Abstract:
1. A method for producing a Group III nitride semiconductor comprising: growing the Group III nitride semiconductor by MOCVD after forming an MN buffer layer on a sapphire substrate by sputtering, the sapphire substrate having an etched surface of a c-plane main surface which is patterned in a concave or convex figure by dry etching; and performing thermal treatment on the etched surface of the sapphire substrate which is exposed in at least one selected from a nitrogen atmosphere and a hydrogen atmosphere at a thermal treatment temperature in a range of 500° C. to less than 700° C.; lowering a temperature of the sapphire substrate to a temperature in a range from 0° C. to 40° C. after heating to the thermal treatment temperature and finishing the thermal treatment of the sapphire substrate; after the lowering of the temperature, increasing the temperature of the sapphire substrate with the exposed and etched surface to a sputtering temperature in a range of 200° C. to less than 700° C. for forming the buffer layer; and after the increasing of the temperature, forming the buffer layer on the exposed and etched surface of the sapphire substrate on which the thermal treatment is finished, by sputtering while keeping the temperature of the sapphire substrate at the sputtering temperature.