Green antisolvent process for quasi-2D perovskite self-powered photodetector with high-performance and fast-response imaging capability

The development trend in the field of photodetection is increasingly leaning towards devices that are high-performance, environmentally friendly, and low-consumption. The low-toxicity systhized process of perovskite materials for photodetectors not only aligns with the environmental and sustainability goals but also offers a strategic advantage in achieving high performance and efficiency. Quasi-two-dimensional (quasi-2D) metal halide perovskites (MHPs) are emerging aspromising candidates for photodetection applications due to its structural diversity and excellent stability. However, the synthesis of quasi-2D MHPs films has traditionally involved the use of more toxic solvents and has been associated with numerous defects. In this study, CHA₂MA₂Pb₃Br₁₀ (CHA = cyclohexylamine, MA = methylamine) MHP thin films were successfully synthesized by adopting low-toxicity acetonitrile (ACN) as the anti-solvent. This innovative approach not only reduces the defect density in the films but also promotes a more enviromentally friendly production process for MHP-based detectors. Furthermore, the self-powered detector based on CHA₂MA₂Pb₃Br₁₀ perovskites demonstrated a high specific detectivity of 2.97 × 10¹² Jones under 460 nm illumination and exhibited favorable stability. This research is valuable for the development of low-cost, stable, and high-performance quasi-2D MHP self-powered photodetectors for imaging applications.