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Plasmons Enhancing Sub-Bandgap Photoconductivity in TiO<inf>2</inf> Nanoparticles Film

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

Authors

Mohammed A. Ibrahem

Profile image of Emanuele Verrelli

Dr Emanuele Verrelli E.Verrelli@hull.ac.uk
Lecturer in Physics, Director of Postgraduate Researchers, Seminar organiser, First aider

Mary O’Neill



Abstract

The coupling between sub-bandgap defect states and surface plasmon resonances in Au nanoparticles and its effects on the photoconductivity performance of TiO2 are investigated in both the ultraviolet (UV) and visible spectrum. Incorporating a 2 nm gold nanoparticle layer in the photodetector device architecture creates additional trapping pathways, resulting in a faster current decay under UV illumination and a significant enhancement in the visible photocurrent of TiO2, with an 8-fold enhancement of the defects-related photocurrent. We show that hot electron injection (HEI) and plasmonic resonance energy transfer (PRET) jointly contribute to the observed photoconductivity enhancement. In addition to shedding light on the below-band-edge photoconductivity of TiO2, our work provides insight into new methods to probe and examine the surface defects of metal oxide semiconductors using plasmonic resonances.

Citation

Ibrahem, M. A., Verrelli, E., Adawi, A. M., Bouillard, J. S. G., & O’Neill, M. (2024). Plasmons Enhancing Sub-Bandgap Photoconductivity in TiO2 Nanoparticles Film. ACS Omega, 9(9), 10169–10176. https://doi.org/10.1021/acsomega.3c06932

Journal Article Type Article
Acceptance Date Jan 24, 2024
Online Publication Date Feb 20, 2024
Publication Date Mar 5, 2024
Deposit Date Mar 26, 2024
Publicly Available Date Mar 27, 2024
Journal ACS Omega
Print ISSN 2470-1343
Electronic ISSN 2470-1343
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 9
Issue 9
Pages 10169–10176
DOI https://doi.org/10.1021/acsomega.3c06932
Keywords Analytical apparatus; Metal nanoparticles; Oxides; Photonics; Plasmonics
Public URL https://hull-repository.worktribe.com/output/4577600

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