Patent ID: 7538351

Claim:
A semiconductor device comprising: a semiconductor substrate comprising a pre-selected surface orientation and crystal direction; a first insulator layer overlying the semiconductor substrate; a first semiconductor active region, overlying the first insulator layer, having a first surface orientation selected from the group consisting of (100) and (110); a trench isolation structure overlying the first insulator layer and neighboring the first semiconductor active region; an opening disposed in the trench isolation structure and the first insulator layer and extending through the trench isolation structure and the first insulator layer; a second insulator layer disposed in the opening only and overlying the semiconductor substrate; a second semiconductor active region, disposed in the opening only and not extending out of the opening, having a second surface orientation selected from the group consisting of (110) and (100) different from the first surface orientation, and overlying the second insulator layer; and wherein MOS devices comprising a first MOS device disposed on the first semiconductor active region and a second MOS device disposed on the second semiconductor active region.