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Optical Properties of Mn-doped GaN

Published online by Cambridge University Press:  01 February 2011

O. Gelhausen ,
E. Malguth ,
M. R. Phillips ,
E. M. Goldys ,
M. Strassburg ,
A. Hoffmann ,
T. Graf ,
M. Gjukic  and
M. Stutzmann
O. Gelhausen
Affiliation:
Microstructural Analysis Unit, University of Technology, Sydney, Broadway, NSW 2007, Australia
E. Malguth
Affiliation:
Microstructural Analysis Unit, University of Technology, Sydney, Broadway, NSW 2007, Australia Institute for Solid-State-Physics, Technical University Berlin, 10623 Berlin, Germany
M. R. Phillips
Affiliation:
Microstructural Analysis Unit, University of Technology, Sydney, Broadway, NSW 2007, Australia
E. M. Goldys
Affiliation:
Division of Information and Communication Sciences, Macquarie University, North Ryde, NSW 2109, Australia
M. Strassburg
Affiliation:
Institute for Solid-State-Physics, Technical University Berlin, 10623 Berlin, Germany Department of Physics and Astronomy, Georgia State University, Atlanta, GA-30303, USA
A. Hoffmann
Affiliation:
Institute for Solid-State-Physics, Technical University Berlin, 10623 Berlin, Germany
T. Graf
Affiliation:
Walter Schottky Institute, Technical University Munich, 85748 Garching, Germany
M. Gjukic
Affiliation:
Walter Schottky Institute, Technical University Munich, 85748 Garching, Germany
M. Stutzmann
Affiliation:
Walter Schottky Institute, Technical University Munich, 85748 Garching, Germany
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Abstract

Molecular beam epitaxy-grown GaN with different Mn concentrations (5–23 × 10 cm-3) and codoped with Si were investigated by cathodoluminescence (CL) spectroscopy and optical transmission measurements. In the GaN:Mn, an intense absorption peak at 1.414 +/- 0.002 eV was observed. This peak was attributed to an internal T2∼> E transition of the deep neutral Mn3+ state since its intensity scaled with the Mn3+ concentration. The CL measurements showed that Mn-doping concentrations around 1020 cm-3 had three effects on the emission spectrum: (i) the donor bound exciton at 3.460 eV was reduced by more than one order of magnitude, (ii) the donor-acceptor-pair band at 3.27 eV was completely quenched and (iii) the yellow luminescence centered at 2.2 eV was the strongly decreased. The latter two effects were attributed to a reduced concentration of VGa. In the infrared spectral range, three broad, Mn-doping related CL emission bands centered at 1.01 ± 0.02 eV, 1.09 ± 0.02 eV and 1.25 ± 0.03 eV were observed. These bands might be related to deep donor complexes, which are generated as a result of the heavy Mn-doping, rather than internal transitions at the Mn atom.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 798: Symposium Y – GaN and Related Alloys , 2003 , Y8.5
Copyright
Copyright © Materials Research Society 2004

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References

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