Weak light imaging has drawn more and more attention because of its promising potential for practical applications in security monitoring and space exploration. In this work, all-inorganic Cs₂AgBiBr₆ double perovskite-based self-powered photodetectors containing inorganic copper thiocyanate (CuSCN) as hole-transport layers (HTLs) are successfully fabricated and applied for weak light imaging, which is the first report on the weak light imaging application of all-inorganic lead-free perovskite photodetectors. CuSCN films with favorable optical property and hole extraction capability are prepared via a cost efficient and fast solvent removal method, demonstrating the potential for high-performance perovskite-based devices as transparent components. It is revealed that the band alignment of the device is effectively optimized with the presence of CuSCN HTLs, which can availably transport holes while block electrons at the Cs₂AgBiBr₆/CuSCN interface, resulting in remarkable improvement of photoresponse performance. The responsivity and detectivity are 0.34 A W⁻¹ and 1.03×10¹³ Jones, respectively. In particular, the light current has a boost of almost 10 times. Furthermore, the photodetectors are integrated into a self built light detection imaging system uti lizing the focused laser scanning imaging mode. With illumination of as low as 5 nW cm⁻² (405 nm), the image involving graphics and words with a size of 5 cm×5 cm can still be distinctly recognized. These results suggest the promising potential of all-inorganic perovskite-based devices for weak light detection and imaging applications.

弱光成像因其在安全监控和太空探索中的实际应用前景广阔而备受关注。在这项工作中，包含无机硫氰酸铜（CuSCN）作为空穴传输层（HTL）的全无机Cs ₂ AgBiBr ₆双钙钛矿基自供电光电探测器已成功制备，并用于弱光成像，这是关于全无机无铅钙钛矿光电探测器的弱光成像应用。通过制备具有良好光学性能和空穴提取能力的CuSCN薄膜。一种经济高效且快速去除溶剂的方法，证明了将高性能钙钛矿基设备用作透明组件的潜力。结果表明，CuSCN HTLs可以有效地优化器件的能带排列，CuSCN HTL可以有效地传输空穴，同时在Cs ₂ AgBiBr ₆ / CuSCN界面处阻断电子，从而显着改善光响应性能。响应度和检测度为0.34 AW ^-1和1.03×10 ¹³琼斯分别。尤其是，光电流几乎提高了10倍。此外，光电探测器被集成到自聚焦的光检测成像系统中，从而利用聚焦激光扫描成像模式。在低至5 nW cm ^-2（405 nm）的照明下，仍可以清晰地识别出涉及图形和文字的大小为5 cm×5 cm的图像。这些结果表明，基于全无机钙钛矿的设备在弱光检测和成像应用中具有广阔的前景。