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Photoelectrochemical cell-typed self-powered UV detectors have attracted intensive research interest due to their low cost, simple fabrication process, and fast response. In this paper, SnO 2 -TiO 2  nanomace arrays composed of SnO 2  nanotube trunk and TiO 2  nanobranches were prepared using soft chemical methods, and an environment-friendly self-powered UV photodetector using this nanostructure as the photoanode was assembled. Due to the synergistic effect of greatly accelerated electron-hole separation, enhanced surface area, and reduced charge recombination provided by SnO 2 -TiO 2  nanomace array, the nanostructured detector displays an excellent performance over that based on bare SnO 2  arrays. The impact of the growing time of TiO 2  branches on the performance of UV photodetector was systematically studied. The device based on optimized SnO 2 -TiO 2  nanomace arrays exhibits a high responsivity of 0.145 A/W at 365 nm, a fast rising time of 0.037 s, and a decay time of 0.015 s, as well as excellent spectral selectivity. This self-powered photodetector is a promising candidate for high-sensitivity, high-speed UV-detecting application.

High-Performance Self-Powered UV Detector Based on SnO2-TiO2 Nanomace Arrays