A Quasi‐Two‐Dimensional Trilayered CsPbBr<sub>3</sub>‐based Dion‐Jacobson Hybrid Perovskite toward High‐Performance Photodetection
Ziyang Wang, Xinyuan Zhang, Ye Huang, Tingting Zhu, Junhua Luo
Abstract
Abstract Quasi‐two‐dimensional (Q‐2D) Dion‐Jacobson (DJ) organic‐inorganic hybrid perovskites based on CsPbBr 3 are promising candidates for photodetection. Previous studies have predicted that the photoresponse of such materials with high inorganic‐layer numbers ( n ) will be more protruding in this portfolio. However, until now, only bilayered ( n =2) CsPbBr 3 ‐based DJ‐type hybrid perovskites are obtained and the higher number of layers ( n >2) remain completely unexplored, owing to the relatively high formation energies. Here, by incorporating diamine into the 3D CsPbBr 3 motif, a new Q‐2D trilayered CsPbBr 3 ‐based DJ‐type hybrid perovskite that contains organic cation and inorganic Cs metal, namely (4‐AMP)Cs 2 Pb 3 Br 10 ( 1 , 4‐AMP 2+ =4‐(aminomethyl)piperidinium, n=3), is obtained. Excitingly, 1 exhibits excellent photoresponse, superior to its single‐layered and bilayered counterparts. The resulting photodetectors thus exhibit a large on/off ratio (>10 3 ), high photodetectivity (6.5×10 10 Jones) and fast response speed (193 μs). As far as we know, 1 is the first Q‐2D CsPbBr 3 ‐based DJ‐type hybrid perovskites with high n numbers. Our results may widen the range of the potential material in application of photodetection and will be helpful to design hybrid perovskites for other advanced optoelectronic devices.