Patent ID: 6930026

Claim:
A method for fabricating a semiconductor wafer, comprising the steps of: (a) depositing a SiGeC crystal layer on a Si substrate, the SiGeC crystal layer having each lattice constant in the plane parallel to the Si substrate that matches with a lattice constant of the Si substrate; (b) growing a first Si crystal layer on the SiGeC crystal layer, the first Si crystal layer having a lattice constant in the plane that matches with a lattice constant of the Si substrate; and (c) phase-separating the SiGeC crystal layer into SiC microcrystals and a matrix SiGeC crystal layer by annealing the Si substrate, and increasing a lattice constant in the plane of the matrix SiGeC crystal layer and the lattice constant in the plane of the first Si crystal layer to become greater than the lattice constant of the Si substrate.