2D perovskites, due to their unique properties and reduced dimension, are promising candidates for future optoelectronic devices. However, the development of stable and nontoxic 2D wide-bandgap perovskites remains a challenge. 2D all-inorganic perovskite Sr2 Nb3 O10 (SNO) nanosheets with thicknesses down to 1.8 nm are synthesized by liquid exfoliation, and for the first time, UV photodetectors (PDs) based on individual few-layer SNO sheets are investigated. The SNO sheet-based PDs exhibit excellent UV detecting performance (narrowband responsivity = 1214 A W-1 , external quantum efficiency = 5.6 × 105 %, detectivity = 1.4 × 1014 Jones @270 nm, 1 V bias), and fast response speed (trise ≈ 0.4 ms, tdecay ≈ 40 ms), outperforming most reported individual 2D sheet-based UV PDs. Furthermore, the carrier transport properties of SNO and the performance of SNO-based phototransistors are successfully controlled by gate voltage. More intriguingly, the photodetecting performance and carrier transport properties of SNO sheets are dependent on their thickness. In addition, flexible and transparent PDs with high mechanical stability are easily fabricated based on SNO nanosheet film. This work sheds light on the development of high-performance optoelectronics based on low-dimensional wide-bandgap perovskites in the future.

中文翻译：

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适用于高性能UV光电探测器的2D钙钛矿Sr2 Nb3 O10。

2D钙钛矿由于其独特的性能和减小的尺寸而成为未来光电器件的有希望的候选者。然而，开发稳定且无毒的2D宽带隙钙钛矿仍然是一项挑战。通过液体剥离合成厚度低至1.8 nm的二维全无机钙钛矿Sr2 Nb3 O10（SNO）纳米片，并且首次研究了基于单个多层SNO片的UV光电探测器（PD）。基于SNO片材的PD表现出出色的紫外线检测性能（窄带响应度= 1214 A W-1，外部量子效率= 5.6×105％，检测度= 1.4×1014 Jones @ 270 nm，1 V偏置）和快速响应速度Trise≈0.4 ms，tdecay≈40 ms），胜过大多数报告的基于2D图纸的单个UV PD。此外，栅极电压可以成功地控制SNO的载流子传输特性和基于SNO的光电晶体管的性能。更有趣的是，SNO片的光电检测性能和载流子传输性能取决于其厚度。此外，基于SNO纳米片薄膜可轻松制造具有高机械稳定性的柔性和透明PD。这项工作为未来基于低维宽带隙钙钛矿的高性能光电技术的发展提供了启示。