Patent ID: 6953736
Filing Date: 2005-10-11
Classification: H01L,Y10S

Abstract:
1. A method of preparing a semiconductor wafer, which comprises: providing a matching substrate that comprises a handling substrate and a matching layer on the handling substrate, the matching layer having a first lattice parameter on a first surface disposed opposite the handling substrate, and the handling substrate having a second lattice parameter that is different from the first lattice parameter; creating a region of weakness in the matching layer, wherein the region of weakness is configured to facilitate splitting; growing on the first surface of the matching layer a first strained layer of a first semiconductor material in a strained state to impart the same first lattice parameter in the first strained layer as in the matching layer; associating a receiving substrate with the first strained layer to form a composite structure; obtaining a product wafer and a donor wafer by splitting the composite structure at the region of weakness, wherein the product wafer includes the strained first layer and the receiving substrate and a retained portion of the matching layer on the first strained layer, while the donor wafer includes at least a portion of the matching layer; smoothing roughness from the retained portion of the matching layer; and selectively etching the smoothed portion of the matching layer from the first strained layer.