Abstract
Due to their high performance, photoelectrochemical ultraviolet (UV) photodetectors have attracted much attention, but the recombination of photogenerated electrons at the interface of photoanode/electrolyte limited further improvement of photoelectrochemical UV photodetectors (PEC UVPDs). Modification of TiO2 photoanode by SrTiO3 could improve the performance of UVPD, because the energy barrier that is established at the TiO2–SrTiO3 interface could accelerate the separation of the photogenerated electrons-holes pair. However, the recombination center that is caused by the preparation of TiO2@SrTiO3 core-shell heterostructured nanostructure decreases the performance of PEC UVPDs, which is still an important problem that hindered its application in PEC UVPDs. In this paper, we presented a Sr-doped free TiO2@SrTiO3 core-shell heterostructured nanowire arrays as a photoanode for the self-powered PEC UVPD. This will not only accelerate the separation of the photogenerated electrons-holes pair, but it will also reduce the recombination of photogenerated electron-hole pairs in the photoanode. The intrinsic effect of SrTiO3 reaction time on the J variations of UVPDs is investigated in detail. An impressive responsivity of 0.358 A W−1 was achieved at 360 nm for the UVPD based on TiO2@SrTiO3 core-shell heterostructured nanowire arrays, which heretofore is a considerably high photoresponsivity for self-powered photoelectrochemical UVPDs. Additionally, this UVPD also exhibits a high on/off ratio, fast response time, excellent visible-blind characteristic, and linear optical signal response.
Highlights
Due to important application in environmental monitoring and surveillance, missile warning, chemical and physiology analyses, fire detection, and secure communication, the precise detection of ultraviolet (UV) radiation is desperately in demand [1]
Sr-doped free TiO2 @SrTiO3 core-shell heterostructured nanowire arrays were successfully synthesized on Fluorine-doped tin oxide (FTO) glass
We explored the effect of reaction time on the preparation of
Summary
Due to important application in environmental monitoring and surveillance, missile warning, chemical and physiology analyses, fire detection, and secure communication, the precise detection of ultraviolet (UV) radiation is desperately in demand [1]. The photoconductive UVPDs cannot operate without extra power sources, which is applied to urge the photogenerated carriers to generate a photocurrent [2,3,4,5,6] This largely enlarges the device size and weight, which leads to the disadvantages of miniaturization, wireless applications, and intellectualization. The doped Sr2+ may bring more recombination centers and oxygen vacancies in the TiO2 @SrTiO3 heterostructure and damage the carrier transport pathway that is provided by the TiO2 nanowires These lead to more recombination of photogenerated electron and the degradation of the of the PEC UVPD performance [54]. The spectral-response characteristics, photo-sensitivity, response speed, and light intensity dependence of the J signal are tested to estimate the performance of UVPD based on Sr2+ –doped free TiO2 @SrTiO3 core-shell heterostructured NWAs
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