Patent ID: 7736994
Filing Date: 2010-06-15
Classification: H01L,Y10T

Abstract:
1. A method for reusing a donor substrate for manufacturing compound material wafers by a layer transfer method wherein the transfer layer has reduced HF defects than conventional layer transfer methods, which comprises the steps of: providing an initial donor substrate that includes oxygen precipitates or nuclei thereof, forming an insulating layer over the initial donor substrate by a thermal treatment carried out at a temperature of less than 950° C. to limit growth of the oxygen precipitates and thus reduce HF defects in the donor substrate adjacent the insulating layer, forming a predetermined splitting area in the initial donor substrate beneath the insulating layer, attaching the initial donor substrate onto a handle substrate, detaching the donor substrate at the predetermined splitting area, thereby transferring a layer of the initial donor substrate onto the handle substrate to form a compound material wafer wherein the transfer layer has an HF defect density of less than 0.1 defects/cm repeating the steps at least three to 10 times, while maintaining the defect density of the donor substrate at less than 0.1 defects/cm