Patent ID: 8858908

Claim:
A method of producing an n-type group III nitride single crystal, comprising: putting raw materials that include at least a substance including a group III element, an alkali metal, and boron oxide into a reaction vessel; melting the boron oxide by heating the reaction vessel to a melting point of the boron oxide; forming a mixed melt which includes the group III element, the alkali metal, and the boron oxide, in the reaction vessel by heating the reaction vessel to a crystal growth temperature of a group III nitride; dissolving nitrogen into the mixed melt by bringing a nitrogen-containing gas into contact with the mixed melt; and growing an n-type group III nitride single crystal which is doped with oxygen as a donor from the mixed melt comprising from the group III element, the nitrogen, and oxygen from the decomposed boron oxide that is dissolved in the mixed melt.