Ibrahem Mohammed A, Verrelli Emanuele, Adawi Ali M, Bouillard Jean-Sebastien G, O'Neill Mary
Laser Sciences and Technology Branch, Applied Sciences Department, University of Technology, Al-Sinaa Street, Baghdad 10066, Iraq.
UNAM-Institute of Materials Science and Nanotechnology and National Nanotechnology Research Center, Bilkent University, Ankara 06800, Turkey.
ACS Omega. 2024 Feb 20;9(9):10169-10176. doi: 10.1021/acsomega.3c06932. eCollection 2024 Mar 5.
The coupling between sub-bandgap defect states and surface plasmon resonances in Au nanoparticles and its effects on the photoconductivity performance of TiO 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, 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, our work provides insight into new methods to probe and examine the surface defects of metal oxide semiconductors using plasmonic resonances.
研究了金纳米颗粒中亚带隙缺陷态与表面等离子体共振之间的耦合及其对二氧化钛（TiO）光电导性能在紫外和可见光谱范围内的影响。在光电探测器器件结构中加入2纳米的金纳米颗粒层会产生额外的俘获路径，导致在紫外光照下电流衰减更快，并且二氧化钛的可见光电电流显著增强，与缺陷相关的光电流增强了8倍。我们表明，热电子注入（HEI）和等离子体共振能量转移（PRET）共同促成了所观察到的光电导增强。除了揭示二氧化钛的带边以下光电导之外，我们的工作还为利用等离子体共振探测和检查金属氧化物半导体表面缺陷的新方法提供了见解。
