Affiliation:
1. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P. R. China
2. University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100039 P. R. China
Abstract
AbstractTwo‐dimensional (2D) hybrid perovskite materials have been widely used for polarization‐sensitive photodetection due to their fascinating optical and physical attributes. However, studies on those materials that enable strong polarized‐light activities under a weak‐light condition remain quite scarce. Here, by tailoring aromatic cation into 3D prototype, we have successfully obtained a new 2D hybrid perovskite, (FPEA)2(MA)Pb2Br7 (1, where FPEA is 4‐fluorophenethylammonium and MA is methylammonium). The alternative alignment of inorganic and organic structural components results in significant anisotropy, including optical absorption and electric conductivity. The coupling effect of these anisotropic properties in 1 gives rise to strong dichroic activities toward detecting polarized light. Especially, under weak light intensity (∼330 nW/cm2), it can still generate a large polarization ratio up to 1.35, which is even higher than those of some typical 2D materials (i. e., GeSe ∼1.09). Besides, single crystal‐based photodetector of 1 displays fascinating detecting performances, including large photocurrent on/off ratio (∼104), fast response time (∼154/182 μs) and excellent antifatigued stability. These findings disclose the potentials of 1 as a robust candidate for detecting weak polarized light, which has practical applications in the field of polarized optoelectronics.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis,Organic Chemistry