Molecularly thin, two-dimensional all-organic perovskites

作者：Hwa Seob Choi, Jun Lin, Gang Wang, Walter P. D. Wong, In‐Hyeok Park, Fang Lin, Jun Yin, Kai Leng, Junhao Lin, Kian Ping Loh · 发表于：Science · 年份：2024 · DOI：10.1126/science.adk8912 · 被引用次数：48 · 研究领域：Perovskite Materials and Applications、Advanced Photocatalysis Techniques、2D Materials and Applications

Recently, the emergence of all-organic perovskites with three-dimensional (3D) structures has expanded the potential applications of perovskite materials. However, the synthesis and utilization of all-organic perovskites in 2D form remain largely unexplored because the design principle has not been developed. We present the successful synthesis of a metal-free 2D layered perovskite, denoted as the Choi-Loh van der Waals phase (CL-v phase), with the chemical formula A 2 B 2 X 4 , where A represents a larger-sized cation compared to B and X denotes an anion. The CL-v phase exhibits a van der Waals gap enabled by interlayer hydrogen bonding and can be exfoliated or grown as molecularly thin 2D organic crystals. The dielectric constants of the CL-v phase range from 4.8 to 5.5 and we demonstrate their potential as gate dielectrics for thin-film transistors.