Dimensional Reduction of Cs2 AgBiBr6 : A 2D Hybrid Double Perovskite with Strong Polarization Sensitivity.,Angewandte Chemie International Edition

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Dimensional Reduction of Cs2 AgBiBr6 : A 2D Hybrid Double Perovskite with Strong Polarization Sensitivity.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-12-19 , DOI: 10.1002/anie.201911551
Yaobin Li ₁ , Tao Yang ₁ , Zhiyun Xu ₁ , Xitao Liu ₁ , Xiaoying Huang ₁ , Shiguo Han _{1,

2} , Yi Liu _{1,

2} , Maofan Li ₁ , Junhua Luo _{1,

2} , Zhihua Sun _{1,

2}

Affiliation

By dimensional reduction of the 3D motif of Cs2 AgBiBr6 , a lead-free 2D hybrid double perovskite, (i-PA)2 CsAgBiBr7 (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 αb /αc =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.

中文翻译：

Cs2 AgBiBr6的尺寸减小：具有强偏振敏感性的二维杂化双钙钛矿。

通过尺寸缩小Cs2 AgBiBr6的3D图案，成功设计了无铅2D杂化双钙钛矿（i-PA）2 CsAgBiBr7（1，i-PA = isopentylammonium）。它采用量子限制的双层结构，有机和无机薄片交替排列。引人注目的是，独特的2D体系结构赋予了其高度各向异性的物理特性，包括电导率和光吸收率（在405 nm处，αb/αc= 1.9）。这种各向异性属性导致强偏振敏感响应，具有高达1.35的大二向色比，可与某些2D无机材料相比。这是对极化强度强的杂化双钙钛矿的首次研究。1的晶体器件还具有快速的响应速度（约200μs）和出色的稳定性。

更新日期：2020-01-24

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