Journal
THIN SOLID FILMS
Volume 774, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2023.139853
Keywords
Titania, p-n thin film; Self-driven photodetector; Oxidation resistance; Moisture resistance
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In this study, narrow bandgap selenium (Se)-sensitized TiO2 thin films were prepared by spin-coating of Se inks onto a TiO2 mesoporous layer, which forms a p-Se/n-TiO2 heterojunction interface and shows potential for self-driven visible-light detection and sensing.
Semiconductor-sensitized TiO2 thin films have been widely applied in optoelectronic devices. Here we prepared narrow bandgap (similar to 1.77 eV) selenium (Se)-sensitized TiO2 thin films by spin-coating of Se inks onto a TiO2 mesoporous layer, which forms a p-Se/n-TiO2 heterojunction interface and holds promise for self-driven visible-light detection and sensing. Under irradiation by simulated sunlight and monochromatic visible-light, the resultant films exhibit large on-off switch ratio, fast response speed, and high spectral responsivity and detectivity at zero bias. Meantime, the p-Se/n-TiO2 films show notable photoresponse stability and can maintain 92% and 64% of photocurrent of the pristine device after 2-month air storage and 72 h water soaking, respectively. Such good oxygen and moisture resistance of Se/TiO2 thin films would be promising as applied in environmentally-stable heterojunction optoelectronic devices.
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