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Photoreflectance and Resonant Raman Scattering in Short Period Si/Ge Superlattices on Ge (001) and Si (001)

Published online by Cambridge University Press:  22 February 2011

U. Menczigar ,
K. Eberl  and
G. Abstreiter
U. Menczigar
Affiliation:
Walter Schottky Institut, TU München, 8046 Garching, Germany.
K. Eberl
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY.
G. Abstreiter
Affiliation:
Walter Schottky Institut, TU München, 8046 Garching, Germany.
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Abstract

Short period Si/Ge superlattices have been grown on Ge (001) and Si (001) substrates by molecular beam epitaxy. The optical properties of the superlattices have been studied with photoreflectance. (PR) and resonant Raman scattering (RRS). With PR we are able to observe new, structural induced transitions for all superlattices which are related to E0-and E1-like gaps. The analysis of PR spectra is complicated by an optical etalon effect if the samples are sufficently thick. The E1-like transitions in the range between 1.9eV and 2.7eV are also studied with RRS. Due to the confinement of the optical phonons in the Ge and Si layers RRS is able to probe the bandstructure in each layer seperately. Localized electronic states in the Ge layers can be observed with RRS for a Si4Ge18 superlattice and are compared with PR measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 220: Symposium B – Silicon Molecular Beam Epitaxy , 1991 , 361
Copyright
Copyright © Materials Research Society 1991

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