Patent ID: 7033905
Filing Date: 2006-04-25
Classification: C30B,H01L

Abstract:
1. A method of recycling a donor wafer after detachment of a useful layer of a semiconductor material therefrom, wherein the donor wafer, after detachment of the useful layer, includes a substrate, a buffer structure on the substrate, and a remaining portion of the useful layer, the buffer structure including a buffer layer that has a first side with first crystalline properties, for association with the substrate, and a second side with second crystalline properties that are different from the first crystalline properties, for association with the useful layer, and a portion transitioning between the first and second properties, which method comprises mechanically removing at least part of the remaining portion of the useful layer while preserving the buffer layer in order to provide a donor wafer surface that is suitable for use in a subsequent detachment of a new useful layer.