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2003 | 103 | 6 | 573-578
Article title

Localization Effects in GaN/AlGaN Quantum Well - Photoluminescence Studies

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Abstracts
EN
Exciton localization in GaN/AlGaN quantum well structures is studied by photoluminescence. An anomalous temperature behavior of the photoluminescence from the quantum well is observed. With increasing temperature the energy position of the excitonic emission line first decreases up to 20 K, then increases, reaching a maximum around 90 K, and then decreases again in the higher temperature range. The observed behavior is discussed in terms of localization at the interface potential fluctuations. It is argued that the temperature activated migration and subsequent release of the excitons from traps that occurs between 20 K and 90 K are responsible for the observed S-like shape of the energy dependence. The obtained results allow a direct characterization of the energy fluctuations present in GaN/AlGaN quantum wells grown by different techniques.
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Contributors
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • Groupe d'Etude des Semiconducteurs, CNRS-UMR5650 Université Montpellier 2, Montpellier, France
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland
author
  • CNRS - CRHEA, rue Bernard Grégory, Valbonne-Sophia-Antipolis, France
author
  • CNRS - CRHEA, rue Bernard Grégory, Valbonne-Sophia-Antipolis, France
author
  • High Pressure Research Center, Polish Academy of Sciences, Sokołowska 29/37, Warsaw, Poland
author
  • High Pressure Research Center, Polish Academy of Sciences, Sokołowska 29/37, Warsaw, Poland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv103n609kz
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