Two-dimensional H 4 Nb 6 O 17 for transparent and flexible UV photodetectors

We first report two-dimensional H 4 Nb 6 O 17 nanosheets for high performance ultraviolet photodetectors (UV PDs). The H 4 Nb 6 O 17 nanosheets are synthesized through a simple solid-state reaction and liquid exfoliation technique. The individual H 4 Nb 6 O 17 nanosheet device displays outstanding UV-detecting performance, including high responsivity (3.8 AW −1 ), high detectivity (1.6 ×10 12 Jones), and fast response speed (1.5/138 ms) at 300 nm light irradiation at 3 V bias. Furthermore, the H 4 Nb 6 O 17 nanosheets film is fabricated via an easy drop-coating process, and shows high transparency (>75%) in the visible light range. More importantly, the H 4 Nb 6 O 17 nanosheet film device exhibits satisfactory photocurrent (12 nA) and on/off ratio (100), and maintains excellent performance after many bending tests. This work not only introduce a promising candidate for UV PD, but also suggests the broad prospect of H 4 Nb 6 O 17 nanosheets in wearable electronic devices in the future.