Patent attributes
The present invention is a method for producing a semiconductor wafer, comprising at least steps of, epitaxially growing a Si1-XGeX layer (0<X<1) on an SOI wafer, forming a Si1-YGeY layer (0≦Y<X) on the epitaxially grown Si1-XGeX layer, and then enriching Ge in the epitaxially grown Si1-XGeX layer by an oxidation heat treatment so that the Si1-XGeX layer becomes an enriched SiGe layer, wherein, at least, the oxidation heat treatment is initiated from 950° C. or less under an oxidizing atmosphere, and the oxidation is performed so that the formed Si1-YGeY layer remains during a temperature rise to 950° C. Thereby, there can be provided a method for producing a semiconductor wafer by which the lattice relaxation of the SiGe layer in an SGOI wafer can be sufficiently performed by a heat treatment for a short time and its production cost can be reduced.
