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Excitonic transport in ZnO

Published online by Cambridge University Press:  14 June 2012

Martin Noltemeyer ,
Frank Bertram ,
Thomas Hempel ,
Barbara Bastek ,
Andrey Polyakov ,
Juergen Christen ,
Matthias Brandt ,
Michael Lorenz  and
Marius Grundmann
Martin Noltemeyer*
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Frank Bertram
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Thomas Hempel
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Barbara Bastek
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Andrey Polyakov
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Juergen Christen
Affiliation:
Institute of Experimental Physics, Otto-von-Guericke-University Magdeburg, 39116 Magdeburg, Germany
Matthias Brandt
Affiliation:
Institut für Experimentelle Physik II, University Leipzig, 04009 Leipzig, Germany
Michael Lorenz
Affiliation:
Institut für Experimentelle Physik II, University Leipzig, 04009 Leipzig, Germany
Marius Grundmann
Affiliation:
Institut für Experimentelle Physik II, University Leipzig, 04009 Leipzig, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The temperature dependence of diffusion length, lifetime, and diffusivity of the free exciton is measured in a commercial ZnO-substrate as well as in an epitaxial ZnO quantum well using nm-spatially and ps-time-resolved cathodoluminescence spectroscopy. The characteristic temperature dependence of the exciton mobility gives information of the underlying excitonic scattering processes. Since excitons are neutral particles, scattering at ionized impurities should be not effective. On both samples, with decreasing temperature, the diffusion lengths, lifetimes, and diffusivity give rise to a monotonic increase of the excitonic mobility. Two different methods will be discussed and are used for determining the excitonic transport parameters. On the one hand, we are able to perform completely pulsed excitation experiments, and on the other hand, a combination of cw excitation and pulsed excitation in two independent measurements is used.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 17: Focus Issue: Oxide Semiconductors , 14 September 2012 , pp. 2225 - 2231
Copyright
Copyright © Materials Research Society 2012

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References

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