Patent ID: 6740548
Filing Date: 2004-05-25
Classification: H01L

Abstract:
A method of fabricating a semiconductor device in a silicon on insulator (SOI) substrate comprising the steps of:a) providing a semiconductor body including a silicon supporting substrate, a silicon oxide layer supported by the substrate, and a silicon layer overlying the silicon oxide layer; b) forming a semiconductor component in the silicon layer over a portion of the silicon oxide layer; c) forming an etch mask on a surface of the substrate opposite from the component including forming a silicon nitride layer on the surface of the substrate and then preferentially masking and etching the silicon nitride layer to expose the silicon in the substrate underlying the portion of the silicon oxide layer; d) applying a preferential etchant through the etch mask to selectively etch the silicon in the substrate underlying the portion of the silicon oxide layer; and e) providing a metal layer in the etched portion of the substrate to provide heat removal from the component during operation of the component.