Patent ID: 7233018

Claim:
A high voltage metal oxide semiconductor field effect transistor, comprising: a base substrate comprising: a Si substrate; a relaxed SiGe epitaxial layer formed on at least a portion of the Si substrate; a SiGe epitaxial layer formed on at least a portion of the relaxed SiGe epitaxial layer; and a Si epitaxial layer formed on at least a portion of the SiGe epitaxial layer; a gate insulating layer formed on at least a portion of the base substrate a gate formed over the base substrate and electrically isolated from the base substrate by the gate insulating layer; a source region formed at least in a first portion on or in the SiGe epitaxial layer near the gate; a drift region formed in a second portion of the SiGe epitaxial layer near the gate; and a drain region formed in a predetermined portion of the drift region.