Perovskite Photodiodes With Genuine Solar‐Blind Response and Their Monolithic Integration With TFT Backplanes for Imaging

Solar‐blind photodetectors (SBPs) have essential civilian and military applications such as corona discharge monitoring and missile sensing. The solution‐processable perovskites may revolutionize SBPs in low‐cost, large‐area and flexibility, although their development is greatly hindered by the absorption bandgap mismatch and the challenges to integrate with readout circuits. Here, we present the first perovskite SBPs based on a SnO 2 /Cs 3 Cu 2 I 5 /PTAA photodiode and a top‐illuminated comb‐shaped gold electrode. Benefited from optical field redistribution and interfacial electric regulation, PTAA acts as a self‐filtering hole transport layer to reshape the spectral response. The device achieves a peak detectivity of 1.50 × 10 12 Jones at 240 nm, an ultrafast rise/fall time of 4.1/4.2 µs, and a superior 124 dB linear dynamic range, which significantly outperforms the reported perovskite photodetectors and inorganic SBPs. Finally, a monolithically integrated 12 × 12 thin‐film transistor (TFT) array is demonstrated for real‐time imaging, paving the way for low‐cost, high‐performance solar‐blind imaging technology.