Browsing by Author "Verrelli, Emanuele"

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    Plasmons enhancing sub-bandgap photoconductivity in TiO₂ nanoparticles film
    (American Chemical Society, 2024-02-20) Ibrahem, Mohammed A.; Verrelli, Emanuele; Adawi, Ali M.; Bouillard, Jean-Sebastien G.; O'Neill, Mary
    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 $TiO_2$, 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 $TiO_2$, our work provides insight into new methods to probe and examine the surface defects of metal oxide semiconductors using plasmonic resonances.