Patent ID: 7632739
Filing Date: 2009-12-15
Classification: H01L

Abstract:
1. A process for reducing defects on an active layer that is transferred during fabricating of a hybrid substrate, which process comprises providing a first insulator layer on a first substrate of semiconductor material, the layer having an exposed surface; forming a roughened surface on the first insulator layer; providing a second insulator layer of semiconductor material on the roughened surface of the first insulator layer to form a trapping zone at an interface between the layers; bonding a second substrate onto the second insulator layer by molecular adhesion, wherein one of the substrates includes a zone of weakness therein formed by implantation of atomic species and defining an active layer; and transferring the active layer by detachment at the zone of weakness to form the hybrid substrate, wherein the roughened surface of the first substrate forms a trapping zone that is capable of retaining gaseous atomic species present at the interface of the layers to reduce formation of defects on the surface of the active layer that is transferred.