Achieving Low Cost and High Performance Flexible CsPbIBr₂ Perovskite Photodetectors Arrays with Imaging System via Dual Interfacial Optimization and Structural Design

All-inorganic metal halide perovskites are competitive candidate as next-generation flexible photodetectors (PDs) materials due to the remarkable photoelectric properties, enhanced heat stability, and mechanical flexibility. However, constructing low-cost flexible perovskites PDs with high photodetection performance, good operation stability and mechanical robustness, and manufacturing corresponding flexible PDs array have been a challenge. Herein, the PbCl₂ and Zinc(II) Dibenzyldithiocarbamate (Zn(DBDTC)₂) are employed to modify bottom and top interface of CsPbIBr₂ perovskite layer, respectively, to passivate surface trap state, enhance hydrophobicity and resist phase segregation, and improve interface contact. Consequently, the self-powered champion PDs with low-cost Bi₂Te₃ electrode reach a responsivity of 0.38 A W⁻¹ and a maximum detectivity of 3.44 × 10¹³ Jones at 570 nm, and maintain the outstanding long-term and operational stability without additional encapsulation. Meanwhile, the HTL-free flexible PDs based on low-temperature CsPbIBr₂ perovskite layer exhibit impressive photodetection performance and mechanical robustness in bending test. More importantly, the flexible PDs array (5 × 5 pixels) and corresponding imaging system are fabricated with uniform and clear imaging results under flatting and bending state. This research is of great significance for the application of stable and high-performance inorganic perovskites PDs and flexible array imaging systems.