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We first report two-dimensional (2D) perovskite Ca 2 Nb 3 O 10 ultraviolet photodetectors (UV PDs), which are prepared via a facile calcination-exfoliation method. The 2D Ca 2 Nb 3 O 10 PDs demonstrate high performance at 3 V at 280 nm, high responsivity (14.94 A W –1 ), high detectivity (8.7 × 10 13 Jones), high spectral selectivity ( R 280 / R 400 = 8.84 × 10 3 ), fast speed (0.08/5.6 ms), and long-term stability, exceeding those of most reported UV PDs. Furthermore, the Ca 2 Nb 3 O 10 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 Ca 2 Nb 3 O 10 nanosheets may be one of the optimum semiconductor materials for next-generation high-performance UV PDs.
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Zhang et al. (2020) studied this question.
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