Patent ID: 7473614
Filing Date: 2009-01-06
Classification: H01L

Abstract:
1. A method comprising forming an etch stop layer in a silicon-on-insulator (SOI) wafer, the etch stop layer overlying an insulating layer of the SOI wafer, wherein the etch stop layer comprises at least two different materials including silicon nitride and at least one of nitrogen-doped silicon dioxide or silicon oxynitride, wherein forming the etch stop layer comprises implanting nitrogen into the SOI wafer with a maximum concentration of the implanted nitrogen at an interface between an upper silicon layer and the insulating layer of the SOI wafer and annealing the SOI wafer to form the etch stop layer, wherein forming the etch stop layer comprises implanting nitrogen into the SOI wafer and annealing the SOI wafer to form the etch stop layer.