${\rm NaTaO}_{3}$ -Based Ultraviolet Photodetector With Capacitive Efficacy

In this letter, uniform NaTaO₃ microcube films were synthesized on tantalum foils by a facile low temperature hydrothermal method. The capacitance characteristic of the film was demonstrated by Mott-Schottky measurement. Then, ultraviolet (UV) detector based on NaTaO₃ film was fabricated with Ag electrodes. At 5 V reverse bias, the current was 20.2 nA under the irradiation of 260-nm UV light, which is 13 times larger than that under dark condition (1.5 nA). The displacement current was observed in the device due to large capacitance existing between Ag electrodes and NaTaO₃ film. The devices show a rise time of 4.6 s and a decay time of 15.4 s. These studies suggest the potential application of NaTaO₃ film in fabricating UV detectors with low power dissipation.