Molecularly thin, two-dimensional all-organic perovskites
成果类型：
Article
署名作者：
Choi, Hwa Seob; Lin, Jun; Wang, Gang; Wong, Walter P. D.; Park, In-Hyeok; Lin, Fang; Yin, Jun; Leng, Kai; Lin, Junhao; Loh, Kian Ping
署名单位：
Hong Kong Polytechnic University; Southern University of Science & Technology; National University of Singapore; Chungnam National University; South China Agricultural University; Hong Kong Polytechnic University
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-10201
DOI：
10.1126/science.adk8912
发表日期：
2024-04-05
页码：
60-66
关键词：
摘要：
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 A2B2X4, 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.