A rare 3D hybrid bimetal halide ferroelectric:(3-Hydroxypyrrolidinium)2RbBiBr6  

一种罕见的三维杂化双金属卤化物铁电体:(3-Hydroxypyrrolidinium)2RbBiBr6

作　　者：Lei He Ke Xu Ping-Ping Shi Zhi-Bo Liu Wen Zhang Qiong Ye 何雷;徐珂;石萍萍;刘志博;张闻;叶琼(Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189,China

出　　处：《Science China Materials》2022年第10期2879-2883,共5页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21771037,21875035,21991144 and 21805033)。

摘　　要：Organic-inorganic hybrid metal halides have gained worldwide attention due to their structural diversity and intriguing physical&chemical properties[1–5].The metal halides hold great promise in micro-and nano-electronics,energy storage,photocatalysis,optoelectronics and photovoltaics[6–9].In particular,photovoltaic devices containing a compositional derivative of the hybrid metal halide methylammonium lead halide(CH_(3)-NH_(3)PbX_(3),X=Cl,Br or I)have demonstrated remarkably high photoconversion efficiencies[10,11].杂化双金属卤化物由于具有丰富的结构并且在光电和光伏器件领域中具有广阔的应用前景,因而引起广泛的关注.然而,RbIBiIII基杂化双金属卤化物的铁电性质尚未被探索.在本文中,我们报道了一例罕见的三维双金属卤化物铁电体:(3-hydroxypyrrolidinium)_(2)RbBiBr_(6)(1).其中,RbIBiII双金属多面体通过共面和共角顶联接成三维笼状无机框架,显现出4连接的lon拓扑结构,而有机阳离子位于其孔洞中.值得注意的是,该铁电体具有非常高的居里温度(432 K),较大的自发极化强度(5.73μC cm^(−2))和热释电系数(28.35μC m^(−2) K^(−1)).这项工作丰富了杂化金属卤化物体系,为探索稳定、绿色铁电材料提供了一种可行的策略.

关 键 词：铁电体 金属卤化物 铁电材料 居里温度 有机阳离子 热释电系数 光伏器件 拓扑结构 

分 类 号：TB34[一般工业技术—材料科学与工程]