Patent ID: 7071065
Filing Date: 2006-07-04
Classification: H01L,Y10S

Abstract:
1. A method for forming a p-type metal oxide semiconductor field effect transistor (MOSFET), comprising: providing a substrate comprising a layer of silicon germanium having a layer of strained silicon formed thereon, and having a gate insulator formed on the strained silicon layer and a gate formed on the gate insulator; forming a first spacer around the gate and gate insulator; removing the strained silicon layer from source and drain regions to form trenches that expose the silicon germanium layer in the source and drain regions and to form a strained silicon channel region beneath the gate insulator; growing silicon germanium regions on the silicon germanium layer to fill the trenches; and implanting shallow source and drain extensions in silicon germanium material adjacent to ends of the channel region, wherein the shallow source and drain extensions do not extend into to the strained silicon channel region after being implanted.