(PEA)2(FA)Pb2I7/PVDF Composite Flexible Films Enable Self-Powered X-ray Detection with High Sensitivity and a Low Detection Limit
Yuanxiang You, Yaping Gong, Qilin Wei, Huanxin Su, Haojie Xu, Zengshan Yue, Dan Huang, William W. Yu, Shiguo HanAbstract
Metal halide perovskites (MHPs) have attracted significant interest in the field of X-ray detection due to their unique semiconducting properties. However, the self-powered detection capabilities of almost all of these materials rely on their inherent ferroelectricity or heterojunction structures, yet the structure design and fabrication still pose significant challenges. By incorporating a polymer into a centrosymmetric MHP, we successfully prepared (PEA)2(FA)Pb2I7/PVDF composite flexible films (PEA = β-phenylethylamine, FA = formamidine, PVDF = poly(vinylidene fluoride)) and obtained self-powered X-ray responses in a nonpolar perovskite. Notably, the photodetector based on thin films exhibits excellent self-powered X-ray detection performance with a high sensitivity (559.11 μC Gyair–1 cm–2), a low detection limit (29.09 nGyair s–1), and excellent radiation stability. Our work offers a new strategy for self-driven devices without relying on ferroelectricity or heterojunctions, expanding halide perovskites in flexible film applications.