Patent ID: 7247546

Claim:
A method of forming a SiGe layer on a substrate, the method comprising the steps of: depositing a first layer of one of Si and Ge in a first depositing step on said substrate; depositing a second layer of the other of Si and Ge on the first layer in a second depositing step; and repeating said first depositing step and said second depositing step so as to form a combined SiGe layer having a plurality of Si layers and a plurality of Ge layers, wherein respective thicknesses of the Si layers and Ge layers are in accordance with a desired composition ratio of the combined SiGe layer; the substrate is a SiGe-on-insulator (SGOI) structure; and the combined SiGe layer is characterized as a digital alloy of Si and Ge having a thermal conductivity greater than that of a random alloy of Si and Ge.