Photodetection and Imaging Applications of BA2MA4Pb5I16 Ruddlesden–Popper Perovskite

Photodetectors serve as a critical link between photonic and electronic systems, playing a key role in the capture, transmission, and processing of information. Low-dimensional Ruddlesden–Popper (RP) perovskites exhibit remarkable environmental stability, minimal ion migration, and tunable structure, offering significant benefits for the development of stable and practical optoelectronic devices. In this letter, the liquid-phase perovskite BA₂MA₄Pb₅I₁₆·xCH₃NH₂ was effectively synthesized by reacting methylamine gas molecules with RP perovskite powder through a solid–gas interaction, eliminating the requirement for high-boiling-point solvents. Photodetectors and pixelated imaging devices were constructed by the spin-coating technique. Detectors with outstanding sensitivity for detecting faint light and fast response capabilities were realized, facilitating high-resolution imaging of various objects. This letter offers novel insights and approaches to promote the application of perovskite materials in the field of photodetection and imaging.