Patent ID: 6927138
Filing Date: 2005-08-09
Classification: H01L

Abstract:
1. A method of semiconductor device fabrication using a semiconductor substrate comprising a lattice-strain relaxed silicon germanium layer and a lattice strained silicon layer formed in this order on a silicon substrate or on a substrate having a silicon layer on the surface thereof, said method comprising: an etching step comprising etching portions for device isolation regions of said semiconductor substrate so as to form device isolation grooves; a deposition step comprising depositing a silicon film on said semiconductor substrate, including in the device isolation grooves formed in said etching step so that the silicon film contacts sidewalls of at least the lattice-strain relaxed silicon germanium layer and sidewalls of the lattice strained silicon layer at least along side(s) of the grooves; an oxidation step of oxidizing the deposited silicon film; and forming transistors in respective areas between the grooves in and/or over the lattice strained silicon layer.