Fast response and high sensitive photoelectrochemical ultraviolet detectors based on electrospinning SrTiO3 nanowires.

One-dimensional nanowires can provide a direct electron transmission channel, as a result, the photogenerated carriers can be more easily and quickly transferred to the current collector. In a photoelectrochemical (PEC) ultraviolet (UV) detector, photoanode assemble using nanowires also possesses a large specific surface area to be beneficial for contacting between the electrolyte and photoanode. In this work, the SrTiO₃ nanowires are fabricated by electrospinning and then assembled PEC UV detectors. Under UV illumination, the detector based on the SrTiO₃ nanowires presents a superior detection performance with a response time of 8 ms. In particular, the device exhibits an efficient detection ability for weak UV light. Under the UV illumination intensity of 5 μW cm^{− 2}, the current density J_sc reaches 11.3 nA cm^{− 2}. The device also presents visible-blind, outstanding linear response and excellent repeatability under periodic UV irradiation. [ABSTRACT FROM AUTHOR]