Patent ID: 7977221
Filing Date: 2011-07-12
Classification: H01L

Abstract:
1. A method for producing a strained Si—SOI substrate, comprising the steps of: growing a SiGe mixed crystal layer on an SOI substrate having an Si layer of not less than 5 nm in thickness and a buried oxide film; forming a protective film on the surface of the SiGe mixed crystal layer; implanting light element ions into the vicinity of the interface between the silicon layer and the buried oxide film; performing a first heat treatment for heat treating the substrate at a temperature in the range of 400 to 1000° C.; performing a second heat treatment for heat treating the substrate at a temperature not lower than 1050° C. under an oxidizing atmosphere; performing a third heat treatment for heat treating the substrate at a temperature not lower than 1050° C. under an inert atmosphere; removing a Si oxide film formed on the surface; and forming a strained Si layer; wherein the temperature of the third heat treatment is not less than the temperature of the second heat treatment.