Two-photon excitation spectroscopy of coupled asymmetric GaN/AlGaN quantum discs

Lee, K. H., Birner, S., Na, J. H., Taylor, R. A., Yi, S. N., Park, Y. S., Park, C. M. and Kang, T. W. (2006) Two-photon excitation spectroscopy of coupled asymmetric GaN/AlGaN quantum discs. Nanotechnology, 17 23: 007-5754-007-5758. doi:10.1088/0957-4484/17/23/007


Author Lee, K. H.
Birner, S.
Na, J. H.
Taylor, R. A.
Yi, S. N.
Park, Y. S.
Park, C. M.
Kang, T. W.
Title Two-photon excitation spectroscopy of coupled asymmetric GaN/AlGaN quantum discs
Journal name Nanotechnology   Check publisher's open access policy
ISSN 0957-4484
1361-6528
Publication date 2006-12-14
Sub-type Article (original research)
DOI 10.1088/0957-4484/17/23/007
Volume 17
Issue 23
Start page 007-5754
End page 007-5758
Total pages 5
Place of publication Bristol, U.K.
Publisher Institute of Physics Publishing
Language eng
Subject 1007 Nanotechnology
Formatted abstract
By using two-photon excitation spectroscopy we take advantage of the increased spatial resolution to perform time-integrated and time-resolved photoluminescence measurements on several discrete stacks of GaN quantum discs. The stack structure consisted of coupled asymmetric GaN quantum discs with embedded AlGaN barriers, which were grown at the tip of a GaN nanocolumn. We observed that with increasing optical excitation power the carrier lifetime decreased due to free-carrier screening, with an enhancement of the screening effect in the larger quantum disc due to carrier tunnelling from the smaller quantum disc.
Keyword GaN
Gallium nitride
AlGaN
Aluminium gallium nitride
Electron tunneling
Measurement theory
Photoluminescence
Photons
Spectroscopic analysis
Free-carrier screening
Stack structures
Time-resolved photoluminescence measurements
Two-photon excitation spectroscopy
Semiconducting aluminum compounds
Spectroscopy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mathematics and Physics
 
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