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Extended X-ray Absorption Fine Structure Studies of GaN Epilayers Doped in situ with Er and Eu During Molecular Beam Epitaxy

Published online by Cambridge University Press:  01 February 2011

V. Katchkanov ,
J. F. W. Mosselmans ,
S. Dalmasso ,
K. P. O'Donnell ,
R. W. Martin ,
O. Briot ,
N. Rousseau  and
G. Halambalakis
V. Katchkanov
Affiliation:
Department of Physics, Strathclyde University, 107 Rottenrow East, Glasgow, G4 0NG, United Kingdom Synchrotron Radiation Department, CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
J. F. W. Mosselmans
Affiliation:
Synchrotron Radiation Department, CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom
S. Dalmasso
Affiliation:
Department of Physics, Strathclyde University, 107 Rottenrow East, Glasgow, G4 0NG, United Kingdom
K. P. O'Donnell
Affiliation:
Department of Physics, Strathclyde University, 107 Rottenrow East, Glasgow, G4 0NG, United Kingdom
R. W. Martin
Affiliation:
Department of Physics, Strathclyde University, 107 Rottenrow East, Glasgow, G4 0NG, United Kingdom
O. Briot
Affiliation:
Groupe d'Études des Semiconducteurs, Université Montpellier Place Eugène Bataillon 34095 Montpellier Cedex 05, France
N. Rousseau
Affiliation:
Groupe d'Études des Semiconducteurs, Université Montpellier Place Eugène Bataillon 34095 Montpellier Cedex 05, France
G. Halambalakis
Affiliation:
Groupe d'Études des Semiconducteurs, Université Montpellier Place Eugène Bataillon 34095 Montpellier Cedex 05, France
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Abstract

The local structure around Er and Eu atoms introduced into GaN epilayers was studied by means of Extended X-ray Absorption Fine Structure above the appropriate rare-earth X-ray absorption edge. The samples were doped in situ during growth by Molecular Beam Epitaxy. The formation of ErN clusters was found in samples with high average Er concentrations of 32±6% and 12.4±0.8%, estimated by Wavelength Dispersive X-ray analysis. When the average Er concentration is decreased to 6.0±0.2%, 1.6±0.2% and 0.17±0.02%, Er is found in localised clusters of ErGaN phase with high local Er content. Similar behaviour is observed for Eu-doped samples. For an average Eu concentration of 30.5±0.5% clusters of pure EuN occur. Decreasing the Eu concentration to 10.4±0.5% leads to EuGaN clusters with high local Eu content. However, for a sample with an Eu concentration of 14.2±0.5% clustering of Eu was not observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 798: Symposium Y – GaN and Related Alloys , 2003 , Y5.10
Copyright
Copyright © Materials Research Society 2004

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