Patent ID: 8283225
Filing Date: 2012-10-09
Classification: H01L

Abstract:
1. A method, comprising: forming an oxide layer on a first active region and a second active region of a semiconductor device by performing a wet oxidation process; removing said oxide layer selectively from said first active region; forming a layer of a semiconductor alloy on said first active region and using said oxide layer on said second active region as a growth mask, wherein forming comprises performing a cleaning process prior to forming said semiconductor alloy on said first active region, and wherein said cleaning process reduces a thickness of said oxide layer formed on said second active region; removing said oxide layer from said second active region; and forming a first gate electrode structure of a first transistor on said layer of a semiconductor alloy and a second gate electrode structure of a second transistor on said second active region, said first and second gate electrode structures comprising a gate insulation layer and a metal-containing gate electrode material, said gate insulation layer comprising a high-k dielectric material.