Patent ID: 7037794

Claim:
A method of forming a strained Si/SGOI structure comprising the steps of: providing a structure including a silicon germanium-on-insulator (SGOI) substrate, a strained Si layer atop the SGOI substrate, a gate dielectric atop the strained Si layer, a gate polySi atop the gate dielectric and a pad nitride atop the gate dielectric; forming a first stack of said pad nitride, said gate polySi, said gate dielectric, said strained Si, and a relaxed SiGe layer of the SGOI substrate; forming a trench oxide in regions adjacent to said first stack; removing said pad nitride from said first stack to expose said gate polySi layer; forming a material stack layer comprising a polySi layer, an insulator and a cap nitride on said exposed gate polySi layer and said trench oxide, said polySi layer is in contact with said gate polySi layer; forming a second stack comprising said cap nitride, said insulator, said polySi layer, and said gate polySi layer, said second stack is located atop said gate dielectric; and forming a raised source/drain region on said strained Si layer in regions adjacent to said second stack, wherein during said forming the raised source/drain region, exposed sidewalls of the trench oxide are protected with a sacrificial nitride spacer.