A Quasi‐Two‐Dimensional Trilayered CsPbBr₃‐based Dion‐Jacobson Hybrid Perovskite toward High‐Performance Photodetection.

Wang, Ziyang; Zhang, Xinyuan; Ye, Huang; Zhu, Tingting; Luo, Junhua

Quasi‐two‐dimensional (Q‐2D) Dion‐Jacobson (DJ) organic‐inorganic hybrid perovskites based on CsPbBr3 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) CsPbBr3‐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 CsPbBr3 motif, a new Q‐2D trilayered CsPbBr3‐based DJ‐type hybrid perovskite that contains organic cation and inorganic Cs metal, namely (4‐AMP)Cs2Pb3Br10 (1, 4‐AMP2 =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 (>103), high photodetectivity (6.5×1010 Jones) and fast response speed (193 μs). As far as we know, 1 is the first Q‐2D CsPbBr3‐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.

METHYLAMMONIUM; PEROVSKITE; OPTOELECTRONIC devices; PHOTODETECTORS; CESIUM; CESIUM compounds

Chemistry - A European Journal, 2022, Vol 28, Issue 35, p1

0947-6539

Academic Journal

10.1002/chem.202200849