Patent ID: 6432792
Filing Date: 2002-08-13
Classification: H01L

Abstract:
A method for manufacturing a substrate for silicon-on-insulator technologies, which comprises:a) providing a semiconductor wafer having a front side for receiving active devices and a back side opposite the front side; b) producing a monocrystalline epitaxial layer on the front side of the semiconductor wafer such that the epitaxial layer has a doping type that is opposite that of the semiconductor wafer; c) producing a mask on the back of the wafer; d) using the mask to produce at least one trench in the back side of the wafer such that the trench extends from the back side of the wafer to an interface between the semiconductor wafer and the epitaxial layer; and e) producing an insulation structure in the trench so that a vertical insulation is provided for active devices received on the epitaxial layer on the wafer.