Patent ID: 7435639
Filing Date: 2008-10-14
Classification: H01L

Abstract:
1. A method for fabricating a dual surface orientation semiconductor structure, comprising: forming a first semiconductor layer having a first crystal orientation; forming an insulator layer over the first semiconductor layer; forming a second semiconductor layer over the insulator layer, where the second semiconductor layer has a second crystal orientation that is different from the first crystal orientation; forming a first trench opening in the second semiconductor layer to expose the insulator layer in a first area, thereby forming an exposed insulator layer; forming at least one second trench opening in the exposed insulator layer to expose a seed area in the first semiconductor layer that is smaller than the first area; and epitaxially growing a first epitaxial semiconductor material from the seed area of the first semiconductor layer that fills the second trench opening and grows laterally over the exposed insulator layer to fill at least part of the first trench opening, thereby forming a first epitaxial semiconductor layer that is isolated from the second semiconductor layer.