Patent ID: 7348633
Filing Date: 2008-03-25
Classification: H01L

Abstract:
1. A substrate for a semiconductor device, the substrate comprising: a stack including: a first semiconductor-on-insulator (SOI) wafer having a first semiconductor layer having a first surface orientation, a second semiconductor layer having a second surface orientation and a first insulator layer therebetween, at least one second semiconductor-on-insulator (SOI wafer having a third semicoductor layer having a third surface orientation, a fourth semiconductor layer having a fourth surface orientation and a second insulator layer therebetween, and an oxidized insulator layer between the first SOI wafer and the at least one second SOI wafer; and a distal end of the stack including a first SOI region of the first SOI wafer including the first semiconductor layer, and at least one second region including one of the following: bulk semiconductor region extending through all insulator layers of the stack, the bulk region having a different thickness than a thickness of the first semiconductor layer of the first SOI region, and a second SOI region having at least one of a different semiconductor thickness than a thickness of the first semiconductor layer and a different surface orientation than the first semiconductor layer, wherein at least one of the first, second, third and fourth surface orientations is different than the other surface orientations.