Patent ID: 6645836
Filing Date: 2003-11-11
Classification: C30B,H01L

Abstract:
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) 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 to become greater than the lattice constant of the Si substrate; and (c) growing a strained Si crystal layer on the matrix SiGeC crystal layer, a lattice constant in the plane of the strain Si crystal layer is the same as the lattice constant in the plane of the matrix SiGeC crystal layer.