Patent ID: 8652948
Filing Date: 2014-02-18
Classification: C30B,H01L

Abstract:
1. A method for growing a crystal of a nitride semiconductor on a principal nitride plane of a base at least one principal plane of which is a nonpolar nitride, the method comprising: heating the base to a predetermined temperature with the principal nitride plane of the base exposed to an atmosphere comprising a first inactive gas for a period t initially epitaxially growing a first nitride semiconductor layer on the principal nitride plane of the base with the principal nitride plane of the base exposed to an atmosphere comprising a second inactive gas and without intentional supply of a silicon (Si) source material; and subsequently epitaxially growing a second nitride semiconductor layer on the first nitride semiconductor layer while supplying an n-type dopant source material with the surface of the first nitride semiconductor layer exposed to an atmosphere containing a third inactive gas; wherein: each of the first, second, and third inactive gases is independently selected from the group consisting of nitrogen (N the base is a freestanding substrate of GaN, AlN, InN, BN, or a mixed crystal thereof; the principal nitride plane of the base is a crystal plane within ±5 degrees inclusive from a (1-100) m-plane; and when heating the base, a component ratio of the first inactive gas to all constituent gases of the atmosphere is from 0.5 to 1.0 in terms of flow ratio.