NaTaO₃-Based Ultraviolet Photodetector With Capacitive Efficacy

In this letter, uniform NaTaO3microcube 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 NaTaO3film 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 NaTaO3film. 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 NaTaO3film in fabricating UV detectors with low power dissipation.