Patent ID: 8710489
Filing Date: 2014-04-29
Classification: H01L

Abstract:
1. A method of producing an epitaxial substrate for electronic devices, comprising the steps of: forming a barrier layer against impurity diffusion on one surface of a high-resistance Si-single crystal substrate; forming a buffer as an insulating layer on the other surface of the high-resistance Si-single crystal substrate; producing an epitaxial substrate by epitaxially growing a plurality of III-nitride layers on the buffer to form a main laminate; and measuring resistance of the main laminate of the epitaxial substrate without contact, wherein the barrier layer against impurity diffusion prevents III elements from diffusing into the high-resistance Si-single crystal substrate from the one surface of the high-resistance Si-single crystal substrate during epitaxially growing the plurality of III group nitride layers, and wherein a lateral direction is a current flow direction in the epitaxial substrate.