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Quantum confined Stark effect and corresponding lifetime reduction in a single InxGa1−xN quantum disk

Appl. Phys. Lett. 95, 181910 (2009); doi:10.1063/1.3257698

Published 5 November 2009

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Mark J. Holmes,1 Young S. Park,1,2 Jamie H. Warner,3 and Robert A. Taylor1
1Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
2Department of Physics and Quantum Functional Semiconductor Research Center, Dongguk University, Seoul 100-715, Republic of Korea
3Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
Time-integrated and time-resolved microphotoluminescence studies were carried out on InxGa1−xN quantum disks embedded in GaN nanocolumns grown by molecular beam epitaxy. Emission at ~3.33  eV from confined states was detected and observed to blueshift with excitation power; a result of charge screening and the quantum confined Stark effect. Due to the reduced band bending and resulting increased overlap of the confined electron and hole wave functions, the lifetime of the emission was measured to decrease with increasing excitation power. The saturation of the blueshift and lifetime reduction follows that of the peak intensity, indicating a Stark screening process. ©2009 American Institute of Physics
History: Received 28 September 2009; accepted 12 October 2009; published 5 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/181910/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.67.De
    Optical properties of quantum wells
  • 68.65.Fg
    Quantum wells (structure and nonelectronic properties)
  • 78.55.Cr
    Photoluminescence in III-V semiconductors
  • 81.15.Hi
    Molecular, atomic, ion, and chemical beam epitaxy
  • 78.20.Jq
    Electrooptical effects (bulk materials/thin films)
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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