Polarized‐light detection in solar‐blind ultraviolet region is indispensable for optoelectronic applications, whereas new 2D candidates targeted at solar‐blind UV range remain extremely scarce. 2D hybrid perovskite ferroelectrics that combine polarization and semiconducting properties are of increasing interest. Here, using the 3D‐to‐2D dimensional reduction of CH₃NH₃PbCl₃, we designed a multilayered hybrid perovskite ferroelectric, (CH₃CH₂NH₃)₂(CH₃NH₃)₂Pb₃Cl₁₀, which shows spontaneous polarization and a high Curie temperature (390 K) comparable with that of BaTiO₃ (393 K). The wide band gap (ca. 3.35 eV) and anisotropic absorbance stemming from its intrinsic 2D motif, greatly favor its polarization‐sensitive activity in UV region. The device displays excellent polarization‐sensitive behavior under 266 nm, along with a large dichroic ratio (ca. 1.38) and high on/off current ratio (ca. 2.3×10³).

中文翻译：

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利用3D到2D尺寸缩减技术，将多层钙钛矿铁电材料用于日光盲紫外区域中的偏振光检测。

对于光电应用来说，日盲紫外线区域中的偏振光检测是必不可少的，而针对日盲紫外线范围的新型二维候选物仍然非常稀缺。结合极化和半导体特性的2D混合钙钛矿铁电材料越来越受到关注。在这里，使用CH ₃ NH ₃ PbCl ₃的3D到2D降维，我们设计了多层杂化钙钛矿铁电体（CH ₃ CH ₂ NH ₃）₂（CH ₃ NH ₃）₂ Pb ₃ Cl ₁₀表现出自发极化和居里温度（390 K），可与BaTiO ₃（393 K）相媲美。其固有的2D图案产生的宽带隙（约3.35 eV）和各向异性吸光度极大地促进了其在紫外区域的偏振敏感活性。该器件在266 nm波长下表现出出色的偏振敏感特性，并具有大的二向色比（约1.38）和高开关电流比（约2.3×10 ³）。