Patent ID: 9048100
Filing Date: 2015-06-02
Classification: C30B,H01L

Abstract:
1. A nitride semiconductor crystal growth 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 nitride, the nitride semiconductor crystal growth method comprising: heating said base for a period including a period t a first growing step of 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 containing ammonia gas and without the intentional supply of a silicon source material; and a second growing step of 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 ammonia gas, wherein the base is a freestanding substrate of GaN, AlN, InN, or BN or a mixed crystal thereof, the principal nitride plane of the base is a crystal plane within ±5 degrees inclusive from a (0001) c the predetermined temperature, T an epitaxial growth temperature T wherein a flow ratio of an inactive gas component to all constituent gases is between 0.5 and 1.0 both inclusive in the heating step, and a flow ratio of an active gas component to all constituent gases is between 0.5 and 1.0 both inclusive in the first growing step.