Unprecedented 2D Homochiral Hybrid Lead‐Iodide Perovskite Thermochromic Ferroelectrics with Ferroelastic Switching,Angewandte Chemie International Edition

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Unprecedented 2D Homochiral Hybrid Lead‐Iodide Perovskite Thermochromic Ferroelectrics with Ferroelastic Switching
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-03-01 , DOI: 10.1002/anie.202102195
Yu-Ling Zeng ₁ , Xue-Qin Huang ₁ , Chao-Ran Huang ₂ , Hua Zhang ₁ , Fang Wang ₁ , Zhong-Xia Wang ₃

Affiliation

Chiral perovskites have emerged as a significant class of materials showing promising optoelectronic and spintronic applications. Reports of chiral perovskite ferroelectrics, however, have been scarce. In this work, we have successfully synthesized homochiral lead–iodide perovskite ferroelectrics [(R)‐N‐(1‐phenylethyl)ethane‐1,2‐diaminium]PbI₄ and [(S)‐N‐(1‐phenylethyl)ethane‐1,2‐diaminium]PbI₄ by introducing a methyl group into the organic cation of the parent (N‐benzylethane‐1,2‐diaminium)PbI₄. Vibrational circular dichroism spectra identify the chiral mirroring relationship. They both undergo 222F2‐type paraelectric–ferroelectric behavior at around 378 K coupled with clear ferroelastic domain “ON/OFF” switching. Besides, they exhibit an evident thermochromism with color change from orange–yellow to orange–red. To our knowledge, the discovery of integrated ferroelectricity, ferroelasticity, and reversible thermochromism in chiral perovskites is unprecedented.

中文翻译：

前所未有的二维铁手性混合碘化钙钛矿型钙钛矿热变色铁电体，具有铁弹性开关

手性钙钛矿已成为一类重要的材料，显示出有希望的光电和自旋电子应用。但是，关于手性钙钛矿铁电材料的报道很少。在这项工作中，我们成功地合成了同手性碘化钙钛矿型铁电体[（R）-N-（1-苯乙基）乙烷-1，2-二铵] PbI ₄和[（S）-N-（1-苯乙基）乙烷-1,2-二胺鎓]碘化铅₄通过引入甲基成母体（的有机阳离子ñ -benzylethane -1,2-二胺鎓）碘化铅₄。振动圆二色性光谱确定手性镜像关系。他们俩都经历了222 F2型顺电-铁电行为在378 K左右，加上清晰的铁弹性域“ ON / OFF”切换。此外，它们还表现出明显的热致变色，其颜色从橙黄色变为橙红色。据我们所知，在手性钙钛矿中发现集成铁电，铁弹性和可逆热致变色是前所未有的。

更新日期：2021-04-27

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