Ultraviolet photodetector based on NaTaO₃/ZnO composite with enhanced photoelectric performance

Abstract

NaTaO₃/ZnO composites were synthesized via a two-step hydrothermal method. Then ultraviolet detectors based on pure NaTaO₃, ZnO and their composites with different mole ratio were fabricated. Among all the devices, the 1:1 NaTaO₃/ZnO possessed a high photo-to-dark current ratio and stable periodic photoresponse. The photoresponse is facilitated by the synergistic effect between different components and the improved ZnO morphology in the composites, the reduced dimensionality in which provides a straight electron conduction pathway. Additionally, the 1:1 NaTaO₃/ZnO detector also exhibits a low dark current less than 1 nA at 5 V bias, which benefits a lot to the low power dissipation and high sensitivity of devices. These results reveal that NaTaO₃/ZnO composites are good candidates for the fabrication of ultraviolet detectors.

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