US Patent 7250656 Hybrid-orientation technology buried n-well design

A semiconductor structure is provided that includes a hybrid orientated substrate having at least two coplanar surfaces of different surface crystal orientations, wherein one of the coplanar surfaces has bulk-like semiconductor properties and the other coplanar surface has semiconductor-on-insulator (SOI) properties. In accordance with the present invention, the substrate includes a new well design that provides a large capacitance from a retrograde well region of the second conductivity type to the substrate thereby providing noise decoupling with a low number of well contacts. The present invention also provides a method of fabricating such a semiconductor structure.