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Thermo‐Phototronic‐Effect‐Enhanced Photodetectors Based on Porous ZnO Materials
摘要： Self-powered ultraviolet (UV) photodetectors with metal–semiconductor–metal (MSM) structure have attracted extensive attention due to their simple configuration and the fact that they require no external power source. However, the stability of Schottky-contact-based ultraviolet photodetectors is still poor due to the difficulty of controlling the surface states in the semiconductor, where it is almost impossible to obtain the same Schottky barrier heights in different devices. An Ohmic-contacted self-powered ultraviolet photodetector with an MSM structure is constructed by utilizing porous ZnO, which can dramatically increase photodetection performance due to its thermo-phototronic effect. The photocurrent signals of the photodetector at room temperature are 4.88 and 11.25 μA, which can be increased to 5.33 and 13.70 μA, respectively. The underlying physical mechanism of the performance enhancement is revealed through band-diagram analysis. This work extends the types of ZnO material-based photodetectors and holds great potential for developing high-performance self-powered ultraviolet photodetectors.
关键词： thermo-phototronic effect,photodetectors,thermopotential,self-powered electronics,porous ZnO
更新于2025-09-19 17:13:59
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Preparation of Nb2O5-decorated hierarchical porous ZnO microspheres with enhanced photocatalytic degradation of palm oil mill effluent
摘要： In the present work, Nb2O5-decorated hierarchical porous ZnO microspheres (ZnO/Nb2O5) were successfully prepared through a facile surfactant-free method. The as-prepared samples were characterized by X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and Brunauer–Emmett–Teller surface area analyses. Under UV light irradiation, the ZnO/Nb2O5 composites degraded palm oil mill effluent (POME) efficiently and demonstrated much higher photocatalytic activity compared to those of pure ZnO and Nb2O5. The enhanced photocatalytic degradation performance of ZnO/Nb2O5 composites was attributed to the high charge separation efficiency and hydroxyl radical generation ability as verified by the photoluminescence spectra. Phytotoxicity test upon the POME degradation over ZnO/Nb2O5 photocatalysis considerably decreased through the measurement of radicle lengths of Vigna radiata. Moreover, the ZnO/Nb2O5 composites were reused several times without appreciable loss of activity. This work revealed that the as-prepared ZnO/Nb2O5 composites have great potential for practical applications in the field of wastewater treatment.
关键词： Nb2O5-decorated hierarchical porous ZnO microspheres,Photocatalytic degradation,Charge separation efficiency,Palm oil mill effluent,Hydroxyl radical generation
更新于2025-09-10 09:29:36