Patent ID: 7098057

Claim:
A method of preparing a high-electron-mobility layer structure comprising the steps of: a) providing a SGOI substrate having a relaxed Si 1-x Ge x layer on insulator; b) forming a Si0.95Ge0.05 seed layer on top of said Si 1-x Ge x layer; c) forming a regrown Si 1-x Ge x buffer layer on top of said Si0.95Ge0.05 seed layer; d) forming a strained silicon channel layer on top of said regrown Si 1-x Ge x layer, e) forming a Si 1-y Ge y spacer layer on top of said strained silicon layer; f) forming a Si 1-z Ge z supply layer on top of said Si 1-y Ge y spacer layer, doping said Si 1-z Ge z supply layer n-type to a concentration level in a range of 1e18–5e19 atoms/cm 3 ; and, g) forming a silicon cap layer on top of said Si 1-z Ge z supply layer.