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)₂FAPb₂Br₇ (1, 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/cm²) and excellent semiconducting characteristics, single crystals of 1 exhibit remarkable BPVE under light illumination, with a high current on/off switching ratio (ca. 10³). More intriguingly, driven by the angular carrier drift originating from spin-dependent BPVE in optically active ferroelectrics, 1 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.

中文翻译：

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来自非手性层状混合钙钛矿铁电晶体的圆偏振光检测的稳健自旋相关各向异性

圆偏振光 (CPL) 检测因其广泛的手电和自旋电子应用而引发了巨大的研究兴趣。铁电材料，尤其是新兴的层状混合钙钛矿铁电体，表现出惊人的体光伏效应 (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，我们首次证明了在一种新的层状杂化钙钛矿铁电晶体 (CPA) ₂ FAPb ₂ Br ₇ ( 1，CPA 是氯丙基铵，FA 是甲脒) 中实现了 CPL 检测的稳健角各向异性，该晶体以旋光非手性极点群。受益于显着的自发极化（5.1 μC/cm²）和优异的半导体特性，单晶1在光照下表现出显着的BPVE，具有高电流开/关切换比（约10 ³）。更有趣的是，在光学活性铁电体中源自自旋相关 BPVE 的角载流子漂移的驱动下，1显示出高灵敏度的自供电 CPL 检测性能，显示出高达 0.98 的稳健角各向异性因子，远远超过材料所实现的内在的手性。这项工作为实现高灵敏度 CPL 检测提供了一种前所未有的方法，为进一步设计用于手性光子应用的光学活性铁电体提供了启示。