High-Performance Self-Powered UV Detector Based on SnO(2)-TiO(2) Nanomace Arrays

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.