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Recombination dynamics of free and bound excitons in bulk GaN
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St Petersburg, 194021, Russian Federation.
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2008 (English)In: Superlattices and Microstructures, ISSN 0749-6036, E-ISSN 1096-3677, Vol. 43, no 5-6, 610-614 p.Article in journal (Refereed) Published
Abstract [en]

We report new data on the transient photoluminescence behaviour of free and donor bound excitons in high quality bulk GaN material grown by HVPE. With 266 nm photoexcitation the no-phonon free exciton has a short decay time, about 100 ps at 2 K, assigned to nonradiative surface recombination. The LO replicas of the free exciton have a much longer decay at 2 K, about 1.4 ns, believed to be a lower bound for the bulk radiative lifetimes of the free excitons at 2 K. The donor bound exciton no-phonon lines exhibit a rather short (about 300 ps) nonexponential decay at 2 K, which appears to be dominated by a scattering process. The corresponding LO replicas and the two-electron transitions have a much longer decay. From the latter, the lower bound of the radiative lifetime of the O- and Si-bound excitons are 1800 ps and 1100 ps, respectively. © 2007 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 43, no 5-6, 610-614 p.
Keyword [en]
Donors, Dynamics, Excitons, GaN, Recombination
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-46322DOI: 10.1016/j.spmi.2007.06.011OAI: oai:DiVA.org:liu-46322DiVA: diva2:267218
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Monemar, BoPaskov, PlamenBergman, Peder

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