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

Ibrahem, Mohammed A.; Verrelli, Emanuele; Cheng, Fei; Adawi, Ali M.; Bouillard, Jean Sebastien G.; O'Neill, Mary


Mohammed A. Ibrahem

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Dr Emanuele Verrelli
Lecturer in Physics, Director of Postgraduate Researchers, Seminar organiser, First aider

Fei Cheng

Mary O'Neill


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 behavior, which is attributed to surface defect states in the ZnO nanoparticles. This study provides a route to the 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 behavior paves the way toward harnessing plasmonic resonances to probe and examine the surface defects of metal oxide semiconductors.


Ibrahem, M. A., Verrelli, E., Cheng, F., Adawi, A. M., Bouillard, J. S. G., & O'Neill, M. (2022). Persistent near-infrared photoconductivity of ZnO nanoparticles based on plasmonic hot charge carriers. Journal of applied physics, 131(10), Article 103103.

Journal Article Type Article
Acceptance Date Feb 23, 2022
Online Publication Date Mar 10, 2022
Publication Date Mar 14, 2022
Deposit Date Mar 11, 2022
Publicly Available Date Mar 14, 2022
Journal Journal of Applied Physics
Print ISSN 0021-8979
Electronic ISSN 1089-7550
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 131
Issue 10
Article Number 103103
Keywords General Physics and Astronomy
Public URL


Accepted manuscript (1.2 Mb)

Copyright Statement
© 2022 Author(s). Published under an exclusive license by AIP Publishing.

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