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Dimensional Reduction of Cs 2 AgBiBr 6 : A 2D Hybrid Double Perovskite with Strong Polarization Sensitivity
Author(s) -
Li Yaobin,
Yang Tao,
Xu Zhiyun,
Liu Xitao,
Huang Xiaoying,
Han Shiguo,
Liu Yi,
Li Maofan,
Luo Junhua,
Sun Zhihua
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201911551
Subject(s) - materials science , anisotropy , polarization (electrochemistry) , conductivity , optoelectronics , crystal structure , dichroic glass , nanotechnology , crystallography , optics , chemistry , physics
By dimensional reduction of the 3D motif of Cs 2 AgBiBr 6 , a lead‐free 2D hybrid double perovskite, ( i ‐PA) 2 CsAgBiBr 7 ( 1, i ‐PA=isopentylammonium), was successfully designed. It adopts a quantum‐confined bilayered structure with alternating organic and inorganic sheets. Strikingly, the unique 2D architecture endows it highly anisotropic nature of physical properties, including electric conductivity and optical absorption (the ratio α b / α c =1.9 at 405 nm). Such anisotropy attributes result in the strong polarization‐sensitive responses with large dichroic ratios up to 1.35, being comparable to some 2D inorganic materials. This is the first study on the hybrid double perovskites with strong polarization sensitivity. A crystal device of 1 also exhibits rapid response speed (ca. 200 μs) and excellent stabilities. The family of 2D hybrid double perovskites are promising optoelectronic candidates, and this work paves a new pathway for exploring new green polarization‐sensitive materials.