Han Shiguo, Liu Xitao, Liu Yi, Xu Zhiyun, Li Yaobin, Hong Maochun, Luo Junhua, Sun Zhihua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , People's Republic of China.
University of Chinese Academy of Sciences, Chinese Academy of Sciences , Beijing 100039 , People's Republic of China.
J Am Chem Soc. 2019 Aug 14;141(32):12470-12474. doi: 10.1021/jacs.9b05124. Epub 2019 Aug 2.
Antiferroelectrics, characterized by the natural polarization-electric field (-) double hysteresis loops, has been developed as a promising branch for energy storage. Here, we present the first antiferroelectric in the booming family of lead iodide hybrid perovskites, (BA)(EA)PbI (, where BA = -butylammonium and EA = ethylammonium), which exhibits one of the highest Curie temperatures (∼363 K) for the majority of known molecular systems. Strikingly, its high-temperature antiferroelectricity, triggered by an antipolar alignment of adjacent dipoles, is confirmed by the characteristic double - hysteresis loops, thus enabling remarkable energy storage efficiencies in the range of 65%-83%. This merit is almost comparable to those of many inorganic counterparts, suggesting the great potential of for energy storage. Another fascinating attribute is that also acts as a room-temperature biaxial ferroelectric with spontaneous polarization of 5.6 μC·cm. As far as we know, this study on the high-temperature antiferroelectric, along with room-temperature biaxial ferroelectricity, is unprecedented for the versatile lead iodide hybrid perovskites, which sheds light on the design of new electric-ordered materials and facilitates their application of high-performance devices.
反铁电体以自然极化 - 电场（-）双滞后回线为特征，已发展成为储能领域一个很有前景的分支。在此，我们展示了蓬勃发展的碘化铅杂化钙钛矿家族中的首个反铁电体（BA）（EA）PbI₄（其中BA = 正丁基铵，EA = 乙铵），它在大多数已知分子体系中表现出最高的居里温度之一（约363 K）。引人注目的是，其由相邻偶极子的反极排列引发的高温反铁电性通过特征双滞后回线得到证实，从而实现了65% - 83%范围内的显著储能效率。这一优点几乎与许多无机同类材料相当，表明其在储能方面具有巨大潜力。另一个引人入胜的特性是，它还作为一种室温双轴铁电体，自发极化强度为5.6 μC·cm²。据我们所知，这项关于高温反铁电体以及室温双轴铁电性的研究对于多功能碘化铅杂化钙钛矿来说是前所未有的，这为新型电有序材料的设计提供了思路，并促进了它们在高性能器件中的应用。
