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Effects of Substrate Orientation on the Spontaneous Ordering of GaAsSb Epilayers Grown by Molecular Beam Epitaxy

Published online by Cambridge University Press:  01 February 2011

Brian P. Gorman ,
Andrew G. Norman ,
Reiko Lukic-Zrnic ,
Terry D. Golding  and
Chris L. Littler
Brian P. Gorman
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A.
Andrew G. Norman
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401, U.S.A.
Reiko Lukic-Zrnic
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A.
Terry D. Golding
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A.
Chris L. Littler
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A.
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Abstract

Spontaneous atomic ordering is investigated in a series of GaAs1−xSbx epilayers (0.51 < x < 0.71) grown by molecular beam epitaxy (MBE) on GaAs substrates with surface orientations of (001), (001) – 8° toward (111)A, (001) – 8° toward (111)B, (115)A, (115)B, (113)A, and (113)B. Atomic ordering in these epilayers was observed from a decrease in the energy gap measured by Fourier transform infrared (FTIR) absorption spectroscopy and corroborated by superlattice reflections in transmission electron diffraction and Raman spectroscopy. Contrary to previous investigations of ordering in III-V alloys, a marked energy gap reduction corresponding to CuPt-B type ordering is observed in the GaAs1−xSbx grown on (111)A-type orientations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 794: Symposium T – Self-Organized Processes in Semiconductor Heteroepitaxy , 2003 , T10.6
Copyright
Copyright © Materials Research Society 2004

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References

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