RAMAN-SCATTERING IN GE-GE1-XSIX SUPERLATTICE

Raman studies of Ge based Ge1-xSix superlattices are presented. Using Raman spectroscopy as a local probe, only the first Ge-Ge1-xSix bilayer underneath the surface is explored. It is shown that the top Ge layer experiences a biaxial elastic stress which we evaluate. The silicon content of the Ge1-xSix layer is deduced from the peak frequency of both Ge-Ge and Ge-Si bond vibrations. The Ge-Ge1-xSix interfacial perfection is also investigated. The Raman data reveal a smearing of this heteroboundary. © 1993 Academic Press. All rights reserved.