Novel Two-Dimensional NbWO6 Nanosheets for High Performance UV Photodetectors

A new ultraviolet photodetector (UV PD) is successfully fabricated based on 2D NbWO 6 (NWO) nanosheets for the first time, which is synthesized by a facile solid-state reaction, ion exchange and liquid exfoliation process. The NWO nanosheet-based PDs exhibit excellent UV detecting performance at 1 V at 290 nm, high responsivity (378 A W −1 ), high external quantum efficiency ( EQE , 1.6 × 10 4 %), high spectral selectivity ( R 290 / R 400 = 8.84 × 10 3 ) and fast speed (1.05/88 ms). Furthermore, the NbWO 6 nanosheets film based PD shows great potential for the application in UV image sensing. This work provides a feasible strategy for the development of new UV PDs based on other potential layered niobates.