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Optical properties of GaP/GaNP core/shell nanowires: a temperature-dependent study
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Department of Physics, University of California, La Jolla, California, USA.
Graduate Program of Materials Science and Engineering, La Jolla, California, USA.
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2013 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 8, no 1, 239- p.Article in journal (Refereed) Published
Abstract [en]

Recombination processes in GaP/GaNP core/shell nanowires (NWs) grown on Si are studied by employing temperature-dependent continuous wave and time-resolved photoluminescence (PL) spectroscopies. The NWs exhibit bright PL emissions due to radiative carrier recombination in the GaNP shell. Though the radiative efficiency of the NWs is found to decrease with increasing temperature, the PL emission remains intense even at room temperature. Two thermal quenching processes of the PL emission are found to be responsible for the degradation of the PL intensity at elevated temperatures: (a) thermal activation of the localized excitons from the N-related localized states and (b) activation of a competing non-radiative recombination (NRR) process. The activation energy of the latter process is determined as being around 180 meV. NRR is also found to cause a significant decrease of carrier lifetime.

Place, publisher, year, edition, pages
Springer, 2013. Vol. 8, no 1, 239- p.
Keyword [en]
Nanowires, III-V semiconductors, Photoluminescence
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-93875DOI: 10.1186/1556-276X-8-239ISI: 000320155000001PubMedID: 23680085OAI: oai:DiVA.org:liu-93875DiVA: diva2:627316
Available from: 2013-06-11 Created: 2013-06-11 Last updated: 2017-12-06Bibliographically approved

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Chen, ShulaChen, WeiminBuyanova, Irina

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