Patent ID: 8715414

Claim:
A method for manufacturing a Si (1-v-w-x) C w Al x N v substrate, comprising the steps of: preparing a different type of substrate; and growing a Si (1-v-w-x) C w Al x N v layer having a main surface (0≦v≦1, 0≦w≦1, 0≦x≦1, and 0≦v+w+x≦1) on the different type of substrate, wherein the component ratio x+v at the main surface of the Si (1-v-w-x) C w Al x N v layer is 0<x+v<1, the component ratio x+v increases or decreases monotonically from the interface between the Si (1-v-w-x) C w Al x N v layer and the different type of substrate to the main surface, and the component ratio x+v at the interface between the Si (1-v-w-v) C w Al x N v layer and the different type of substrate is closer to that of the material of the different type of substrate than the component ratio x+v at the main surface.