Free carrier screening in coupled asymmetric GaN quantum discs

Lee, K. H., Na, J. H., Birner, S., Taylor, R. A., Yi, S. N., Park, Y. S., Park, C. M. and Kang, T. W. (2006). Free carrier screening in coupled asymmetric GaN quantum discs. In: Proceedings of SPIE: Optoeletronic Materials and Devices. Conference on Optoelectronic Materials and Devices, Gwangju, South Korea, (635214-1-635214-9). 5-7 September 2006. doi:10.1117/12.689176

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Author Lee, K. H.
Na, J. H.
Birner, S.
Taylor, R. A.
Yi, S. N.
Park, Y. S.
Park, C. M.
Kang, T. W.
Title of paper Free carrier screening in coupled asymmetric GaN quantum discs
Conference name Conference on Optoelectronic Materials and Devices
Conference location Gwangju, South Korea
Conference dates 5-7 September 2006
Proceedings title Proceedings of SPIE: Optoeletronic Materials and Devices   Check publisher's open access policy
Journal name Proceedings of SPIE - The International Society for Optical Engineering   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Publication Year 2006
Sub-type Fully published paper
DOI 10.1117/12.689176
Open Access Status File (Publisher version)
ISBN 9780819464477
ISSN 0277-786X
Volume 6352
Start page 635214-1
End page 635214-9
Total pages 9
Language eng
Abstract/Summary We present an investigation of free-carrier screening in coupled asymmetric GaN quantum discs with embedded AlGaN barriers using time-integrated and time-resolved micro-photoluminescence measurements, supported by three-dimensional multi-band k.p computational modeling. We observe that with increasing optical excitation the carrier lifetime decreases and emission energy blue-shifts. This originates from the screening of built-in piezo- and pyroelectric fields in the quantum discs by photo-generated free-carriers. Due to non-resonant tunneling of carriers from the smaller disc to the larger disc, free carrier screening is enhanced in the larger disc. The non-resonant tunneling was found to have a significant role in samples with a thin barrier, as the screening decreased with barrier thickness (i.e. decreased tunneling). Computational modeling, was in good agreement with the experimental results.
Subjects 01 Mathematical Sciences
Keyword Photoluminescence
Quantum effect semiconductor devices
Free-carrier screening
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 635214 Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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Created: Thu, 28 Jan 2010, 15:28:39 EST by Thelma Whitbourne on behalf of Faculty of Science