Abstract In this paper, a facile method to synthesize two-dimensional (2D) all-inorganic CsPb2Br5 nano-/micro-sheets at room temperature and their application as the active layer in solution-processed high-performance photodetectors are presented. The obtained CsPb2Br5 nano-/micro-sheets showed a photoluminescence emission peak at 522 nm with a narrow full-width-at-half-maximum of ∼17 nm, showing its high color purity, and an absorption peak at 307 nm with a shoulder peak at 339 nm. Then, the obtained CsPb2Br5 nano-/micro-sheets were used as the active layer in photoconductive photodetector and a high specific detectivity of 1.0 × 1012 Jones with a photoresponsivity of 0.02 A/W and an ultra-low dark current of ∼10−12 An under 16 μW/cm2 405 nm illumination were obtained from photoconductive photodetector Au/CsPb2Br5(85 μm)/Au. Further, the physical mechanism for the enhanced performance is discussed. Therefore, it provides a new method to suppress dark current for high-performance CsPb2Br5 photodetectors.

中文翻译：

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一种合成二维 CsPb2Br5 纳米/微米片的简便方法，用于高性能溶液处理光电探测器

摘要 在本文中，提出了一种在室温下合成二维 (2D) 全无机 CsPb2Br5 纳米/微米片的简便方法及其在溶液处理的高性能光电探测器中作为活性层的应用。获得的 CsPb2Br5 纳米/微米片在 522 nm 处显示出光致发光发射峰，半峰全宽约为 17 nm，显示其高色纯度，在 307 nm 处出现吸收峰，并带有肩峰。峰值在 339 nm。然后，将获得的 CsPb2Br5 纳米/微米片用作光电导光电探测器中的有源层，具有 1.0 × 1012 Jones 的高比探测率、0.02 A/W 的光响应度和~10-12 的超低暗电流从光电导光电探测器 Au/CsPb2Br5(85 μm)/Au 获得低于 16 μW/cm2 405 nm 的照明。更多，讨论了提高性能的物理机制。因此，它为高性能CsPb2Br5光电探测器提供了一种抑制暗电流的新方法。