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Ultrafast carrier dynamics in GaN/InGaN multiple quantum wells nanorods
Author(s): Weijian Chen; Xiaoming Wen; Michael Latzel; Jianfeng Yang; Shujuan Huang; Santosh Shrestha; Robert Patterson; Silke Christiansen; Gavin Conibeer
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Paper Abstract

GaN/InGaN multiple quantum wells (MQW) is a promising material for high-efficiency solid-state lighting. Ultrafast optical pump-probe spectroscopy is an important characterization technique for examining fundamental phenomena in semiconductor nanostructure with sub-picosecond resolution. In this study, ultrafast exciton and charge carrier dynamics in GaN/InGaN MQW planar layer and nanorod are investigated using femtosecond transient absorption (TA) techniques at room temperature. Here nanorods are fabricated by etching the GaN/InGaN MQW planar layers using nanosphere lithography and reactive ion etching. Photoluminescence efficiency of the nanorods have been proved to be much higher than that of the planar layers, but the mechanism of the nanorod structure improvement of PL efficiency is not adequately studied. By comparing the TA profile of the GaN/InGaN MQW planar layers and nanorods, the impact of surface states and nanorods lateral confinement in the ultrafast carrier dynamics of GaN/InGaN MQW is revealed. The nanorod sidewall surface states have a strong influence on the InGaN quantum well carrier dynamics. The ultrafast relaxation processes studied in this GaN/InGaN MQW nanostructure is essential for further optimization of device application.

Paper Details

Date Published: 2 January 2018
PDF: 6 pages
Proc. SPIE 10456, Nanophotonics Australasia 2017, 104565T (2 January 2018); doi: 10.1117/12.2283328
Show Author Affiliations
Weijian Chen, The Univ. of New South Wales (Australia)
Xiaoming Wen, Swinburne Univ. of Technology (Australia)
Michael Latzel, Max-Planck-Institut für die Physik des Lichts (Australia)
Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Jianfeng Yang, The Univ. of New South Wales (Australia)
Shujuan Huang, The Univ. of New South Wales (Australia)
Santosh Shrestha, The Univ. of New South Wales (Australia)
Robert Patterson, The Univ. of New South Wales (Australia)
Silke Christiansen, Max-Planck-Institut für die Physik des Lichts (Germany)
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Freie Univ. Berlin (Germany)
Gavin Conibeer, The Univ. of New South Wales (Australia)


Published in SPIE Proceedings Vol. 10456:
Nanophotonics Australasia 2017
James W. M. Chon; Baohua Jia, Editor(s)

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