Patent ID: 9145621
Filing Date: 2015-09-29
Classification: C01F,C30B,H01L

Abstract:
1. A production method of aluminum based group III nitride single crystal, comprising: a reaction step, wherein a halogenated gas and an aluminum are made contact at a temperature of 300° C. or more to 700° C. or less, and a mixed gas including an aluminum trihalide gas and an aluminum monohalide gas is produced, a converting step, wherein the aluminum monohalide gas in the mixed gas is converted to a solid substance by setting a temperature of the mixed gas equal to or higher than a temperature to which a solid aluminum trihalide deposit, and lower by 50° C. or more than a temperature to which the halogenated gas and the aluminum contact in the reaction step, a separation step, wherein the aluminum trihalide gas is taken out by separating the solid substance and the gas, and a crystal growth step, wherein the aluminum trihalide gas is used for a raw material of aluminum based group III nitride single crystal without lowering its temperature and keeping the temperature equal to or higher than a temperature of the converting step.