Lu Lei, Ma Yu, Wang Jiaqi, Liu Yi, Han Shiguo, Liu Xitao, Guo Wuqian, Xu Haojie, Luo Junhua, Sun Zhihua
College of Chemical Engineering, Fuzhou University, Fuzhou, Fujian, 350116, P. R. China.
State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Chemistry. 2021 Jun 25;27(36):9267-9271. doi: 10.1002/chem.202100691. Epub 2021 May 27.
Two-dimensional (2D) organic-inorganic hybrid perovskites, benefiting from their natural anisotropy of quantum-well motifs and optical properties, have shown remarkable polarization-dependent responses superior to the 3D counterparts. Here, for the first time, multiwavelength polarization-sensitive detectors were fabricated by using single crystals of a guanidine-based 2D hybrid perovskite, (BA) (GA)Pb I (where BA is n-butylammonium and GA is guanidium). Its unique 2D quantum-well structure results in strong crystallographic-dependence of optical absorption. Strikingly, our crystal-based photodetector exhibits a prominent photocurrent dichroic ratio (I /I ) of ∼2.2 at 520 nm, higher than the typical 2D inorganic materials (GeSe, ∼1.09, PdSe , ∼1.8). In addition, notable dichroic ratios of 1.29 and 1.23 at 405 nm and 637 nm are also created for the multiwavelength polarized-light detection. The prominent detecting performances, including low dark current (1.6×10 A), considerable on/off ratio (∼2×10 ), high photodetectivity (∼3.3×10 Jones) and responsivity (∼12.01 mA W ), make (BA) (GA)Pb I a promising candidate for polarized-light detection. This work sheds light on the rational engineering of new 2D hybrid perovskites for the high-performance optoelectronic device applications.
二维（2D）有机-无机杂化钙钛矿，受益于其量子阱结构和光学性质的天然各向异性，展现出优于三维同类材料的显著偏振依赖性响应。在此，首次使用基于胍的二维杂化钙钛矿（BA）（GA）PbI（其中BA为正丁基铵，GA为胍）的单晶制备了多波长偏振敏感探测器。其独特的二维量子阱结构导致光吸收具有强烈的晶体学依赖性。引人注目的是，我们基于晶体的光电探测器在520nm处表现出约2.2的显著光电流二向色比（I /I ），高于典型的二维无机材料（GeSe，约1.09；PdSe ，约1.8）。此外，在405nm和637nm处也分别产生了用于多波长偏振光检测的1.29和1.23的显著二向色比。包括低暗电流（1.6×10 A）、可观的开/关比（约2×10 ）、高光探测率（约3.3×10 Jones）和响应度（约12.01 mA W ）在内的卓越探测性能，使（BA）（GA）PbI成为偏振光检测的有前途的候选材料。这项工作为高性能光电器件应用中新型二维杂化钙钛矿的合理设计提供了思路。
