Patent ID: 8003491
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of forming a semiconductor-on-insulator (SOI) structure, comprising: providing a donor semiconductor wafer having a width, a depth and a height, the width and depth defining X- and Y-axial directions, and the height defining a longitudinal axis; subjecting an implantation surface of the donor semiconductor wafer to an ion implantation step to create a weakened slice in cross-section defining an exfoliation layer of the donor semiconductor wafer; and subjecting the donor semiconductor wafer to a spatial variation step, either before, during or after the ion implantation step, such that depths of the weakened slice from the implantation surface vary spatially and continuously across the donor semiconductor wafer, with respect to a reference plane extending in the X- and Y-axial directions orthogonal to the longitudinal axis, such that a depth of the weakened slice is greater at one extreme of at least one of the X- and Y-directions as compared to a depth of the weakened slice at an opposing extreme of the at least one of the X- and Y-directions.