Li Xiaoqi, Wu Fafa, Yao Yunpeng, Wu Wentao, Ji Chengmin, Li Lina, Sun Zhihua, Luo Junhua, Liu Xitao
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002, China.
University of the Chinese Academy of Sciences, Beijing 100039, China.
J Am Chem Soc. 2022 Aug 10;144(31):14031-14036. doi: 10.1021/jacs.2c06048. Epub 2022 Aug 1.
Circularly polarized light (CPL) detection has sparked overwhelming research interest for its widespread chiroptoelectronic and spintronic applications. Ferroelectric materials, especially emerging layered hybrid perovskite ferroelectrics, exhibiting striking bulk photovoltaic effect (BPVE) present significant possibilities for CPL detection by a distinctive working concept. Herein, for the first time, we demonstrate the realization of robust angular anisotropy of CPL detection in a new layered hybrid perovskite ferroelectric crystal (CPA)FAPbBr (, CPA is chloropropylammonium, FA is formamidinium), which crystallized in an optically active achiral polar point group. Benefiting from the notable spontaneous polarization (5.1 μC/cm) and excellent semiconducting characteristics, single crystals of exhibit remarkable BPVE under light illumination, with a high current on/off switching ratio (ca. 10). More intriguingly, driven by the angular carrier drift originating from spin-dependent BPVE in optically active ferroelectrics, displays highly sensitive self-powered CPL detection performance, showing a robust angular anisotropy factor up to 0.98, which is far more than those achieved by material intrinsic chirality. This work provides an unprecedented approach for realizing highly sensitive CPL detection, which sheds light on the further design of optically active ferroelectrics for chiral photonic applications.
圆偏振光（CPL）检测因其在广泛的手性光电子学和自旋电子学应用中而引发了大量的研究兴趣。铁电材料，特别是新兴的层状混合钙钛矿铁电体，表现出显著的体光伏效应（BPVE），通过独特的工作概念为CPL检测提供了重要的可能性。在此，我们首次展示了在一种新型层状混合钙钛矿铁电晶体（CPA）FAPbBr（CPA为氯丙基铵，FA为甲脒）中实现了稳健的CPL检测角度各向异性，该晶体结晶于光学活性非手性极性点群。受益于显著的自发极化（5.1 μC/cm²）和优异的半导体特性，（CPA）FAPbBr单晶在光照下表现出显著的BPVE，具有高电流开/关切换比（约为10）。更有趣的是，受光学活性铁电体中自旋相关BPVE引起的角度载流子漂移驱动，（CPA）FAPbBr表现出高度灵敏的自供电CPL检测性能，显示出高达0.98的稳健角度各向异性因子，这远高于由材料固有手性所实现的值。这项工作为实现高灵敏CPL检测提供了前所未有的方法，为用于手性光子应用的光学活性铁电体的进一步设计提供了思路。
