Hua Lina, Chen Huaixi, Han Shiguo, Xu Haojie, Lu Lei, Tang Liwei, Wang Beibei, Luo Junhua, Sun Zhihua
College of Chemistry, Fuzhou University, Fuzhou 350116, China.
State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Chem Commun (Camb). 2022 Jan 6;58(4):561-564. doi: 10.1039/d1cc05705g.
By confining the secondary dimethylammonium (DMA) cation in a distorted perovskite cavity, we assembled a new 2D Ruddlesden-Popper metal halide perovskite of (i-BA)(DMA)PbBr (i-BA = -isobutylammonium), in which the DMA cation templates its inorganic perovskite framework and the quantum-well motif renders a fascinating photoresponse. Crystal-based planar arrays exhibit effective photodetection behaviors, including a notable detectivity (∼5.6 × 10 Jones), a high responsivity (∼1.25 A W) and a large switching ratio (∼1.5 × 10). These properties result from its low dark current restricted to the hopping barrier of the insulated organic bilayer and a strong in-plane photoresponse correlated with the perovskite network. This work throws light on the targeted exploration of photosensitive candidates in the family of organic-inorganic hybrid perovskites, as well as high-performance devices.
通过将仲二甲基铵（DMA）阳离子限制在扭曲的钙钛矿空腔中，我们组装了一种新型的二维Ruddlesden-Popper金属卤化物钙钛矿（i-BA）（DMA）PbBr（i-BA =异丁基铵），其中DMA阳离子构成其无机钙钛矿框架，量子阱结构呈现出迷人的光响应。基于晶体的平面阵列表现出有效的光电探测行为，包括显著的探测率（约5.6×10琼斯）、高响应度（约1.25 A/W）和大开关比（约1.5×10）。这些特性源于其受限于绝缘有机双层跳跃势垒的低暗电流以及与钙钛矿网络相关的强面内光响应。这项工作为有机-无机杂化钙钛矿家族中光敏候选物以及高性能器件的定向探索提供了线索。
