High-Performance Two-Dimensional Perovskite CaNbO UV Photodetectors.

We first report two-dimensional (2D) perovskite CaNbO ultraviolet photodetectors (UV PDs), which are prepared via a facile calcination-exfoliation method. The 2D CaNbO PDs demonstrate high performance at 3 V at 280 nm, high responsivity (14.94 A W), high detectivity (8.7 × 10 Jones), high spectral selectivity (/ = 8.84 × 10), fast speed (0.08/5.6 ms), and long-term stability, exceeding those of most reported UV PDs. Furthermore, the CaNbO PDs integrated with poly(ethylene terephthalate) (PET) show excellent flexibility and have high linear dynamic range (96 dB). Our work provides a general strategy for searching new UV PDs based on numerous layered niobates. The CaNbO nanosheets may be one of the optimum semiconductor materials for next-generation high-performance UV PDs.