Low-Temperature Metalorganic Vapor Phase Epitaxy (MOVPE) of GaN using Tertiarybutylhydrazine

Abstract
Tertiarybutylhydrazine was used as a novel nitrogen source for metalorganic vapor phase epitaxy of GaN at low temperatures. Hexagonal epilayers with optically smooth and specular surfaces were grown with trimethylgallium on basal plane sapphire as well as GaAs(111)B substrates. On (001)-oriented GaAs, predominantly cubic GaN was grown. Incorporation of carbon impurities was distinctly lower than in layers grown with dimethylhydrazine. The epilayer quality is presently limited by the purity of the available tertiarybutylhydrazine.