Patent ID: 9236380
Filing Date: 2016-01-12
CPC Classification: H01L

Claim Text:
1. A method for making a semiconductor device comprising: forming, on a first semiconductor layer of a semiconductor-on-insulator (SOI) wafer, a second semiconductor layer comprising a second semiconductor material different than a first semiconductor material of the first semiconductor layer; forming a nitride layer overlying the second semiconductor layer; after forming the nitride layer, performing a thermal treatment in a non-oxidizing atmosphere to diffuse the second semiconductor material into the first semiconductor layer to provide a non-linear diffusion profile of the second semiconductor material within the first semiconductor layer with a given concentration of the second semiconductor material at an interface between the first and second semiconductor layers; and removing the nitride layer and etching a remainder of the second semiconductor layer after performing the thermal treatment using an etchant corresponding to the given concentration at the interface.