Persistent near-infrared photoconductivity of ZnO nanoparticles based on plasmonic hot charge carriers

Ibrahem, MA, Verrelli, E, Cheng, F, Adawi, AM, Bouillard, J-SG and O'Neill, M ORCID: https://orcid.org/0000-0002-0232-5250, 2022. Persistent near-infrared photoconductivity of ZnO nanoparticles based on plasmonic hot charge carriers. Journal of Applied Physics, 131 (10): 103103. ISSN 0021-8979

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Abstract

We report on the coupling of ZnO nanoparticles with plasmonic gold nanoislands in a solution processed photodetector, which results in a clear enhancement in the optical absorption and the electrical responsivity of ZnO nanoparticles to cover the visible and the near-IR (NIR) spectral range, well beyond its intrinsic optical absorption. This enhancement, which arises from the coupling between ZnO nanoparticles and the plasmonically mediated hot electron generation in the Au plasmonic nanoislands, results in a significant plasmonically driven photoresponse in the NIR of 2.5×10-5 A/W. The recorded photocurrent exhibits a persistent behaviour, which is attributed to surface defect states in the ZnO nanoparticles. This study provides a route to solution processed, low-cost device fabrication schemes with important implications on low processing temperature optoelectronics technology to enhance the performance of photovoltaic devices over a wide solar spectrum. Additionally, this unusual behaviour paves the way towards harnessing plasmonic resonances to probe and examine the surface defects of metal oxide semiconductors.

Item Type:	Journal article
Publication Title:	Journal of Applied Physics
Creators:	Ibrahem, M.A., Verrelli, E., Cheng, F., Adawi, A.M., Bouillard, J.-S.G. and O'Neill, M.
Publisher:	AIP Publishing
Date:	14 March 2022
Volume:	131
Number:	10
ISSN:	0021-8979
Identifiers:	Number Type 10.1063/5.0079006 DOI 1524806 Other
Rights:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 131(10) and may be found at https://aip.scitation.org/doi/10.1063/5.0079006
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	14 Mar 2022 09:51
Last Modified:	14 Mar 2022 09:51
URI:	https://irep.ntu.ac.uk/id/eprint/45869

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