1. Plasmons Enhancing Sub-Bandgap Photoconductivity in TiO 2 Nanoparticles Film.
- Author
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Ibrahem MA, Verrelli E, Adawi AM, Bouillard JG, and O'Neill M
- Abstract
The coupling between sub-bandgap defect states and surface plasmon resonances in Au nanoparticles and its effects on the photoconductivity performance of TiO
2 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., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)- Published
- 2024
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