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Carrier thermalization dynamics in single zincblende and wurtzite InP nanowires


Wang, Yuda and Jackson, Howard E. and Smith, Leigh M. and Burgess, Tim and Paiman, Suriati and Gao, Qiang and Tan, Hark Hoe and Jagadish, Chennupati (2014) Carrier thermalization dynamics in single zincblende and wurtzite InP nanowires. Nano Letters, 14 (12). pp. 7153-7160. ISSN 1530-6984; ESSN: 1530-6992


Using transient Rayleigh scattering (TRS) measurements, we obtain photoexcited carrier thermalization dynamics for both zincblende (ZB) and wurtzite (WZ) InP single nanowires (NW) with picosecond resolution. A phenomenological fitting model based on direct band-to-band transition theory is developed to extract the electron-hole–plasma density and temperature as a function of time from TRS measurements of single nanowires, which have complex valence band structures. We find that the thermalization dynamics of hot carriers depends strongly on material (GaAs NW vs InP NW) and less strongly on crystal structure (ZB vs WZ). The thermalization dynamics of ZB and WZ InP NWs are similar. But a comparison of the thermalization dynamics in ZB and WZ InP NWs with ZB GaAs NWs reveals more than an order of magnitude slower relaxation for the InP NWs. We interpret these results as reflecting their distinctive phonon band structures that lead to different hot phonon effects. Knowledge of hot carrier thermalization dynamics is an essential component for effective incorporation of nanowire materials into electronic devices.

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Official URL or Download Paper: http://pubs.acs.org/doi/abs/10.1021/nl503747h

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1021/nl503747h
Publisher: American Chemical Society
Keywords: Nanowire; Zincblende; Wurtzite; Band structure; Excitation spectroscopy
Depositing User: Nabilah Mustapa
Date Deposited: 26 Jul 2015 00:03
Last Modified: 24 Aug 2016 02:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1021/nl503747h
URI: http://psasir.upm.edu.my/id/eprint/36709
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