Patent ID: 7754587
Filing Date: 2010-07-13
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 a second semiconductor layer over at least part of the first semiconductor layer, wherein the second semiconductor layer is electrically isolated from the first semiconductor layer and has a second crystal orientation that is different from the first crystal orientation; forming a mask over the second semiconductor layer; using the mask to form a trench opening that exposes the first semiconductor layer without exposing the second semiconductor layer; filling at least part of a trench opening by epitaxially growing a first epitaxial semiconductor material on at least an exposed surface of the first semiconductor layer to form a first epitaxial semiconductor layer that is electrically isolated from the second semiconductor layer; and blanket depositing silicon to form a polysilicon layer on the mask and to form a crystalline silicon layer to thicken the first epitaxial semiconductor layer so that the polysilicon layer and crystalline silicon layer are substantially coplanar.