Alloying n-Butylamine into CsPbBr3 To Give a Two-Dimensional Bilayered Perovskite Ferroelectric Material

被引:144
作者
Wu, Zhenyue [1 ,2 ]
Ji, Chengmin [1 ]
Li, Lina [1 ]
Kong, Jintao [1 ]
Sun, Zhihua [1 ]
Zhao, Sangen [1 ]
Wang, Sasa [1 ,2 ]
Hong, Maochun [1 ]
Luo, Junhua [1 ]
机构
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[2] Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100039, Peoples R China
关键词
CsPbBr3; ferroelectric materials; perovskites; phase transitions; two-dimensional materials; STRUCTURAL PHASE-TRANSITIONS; ROOM-TEMPERATURE; LARGE-AREA; HALIDE; CRYSTALS;
D O I
10.1002/anie.201803716
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Cesium-lead halide perovskites (e.g. CsPbBr3) have gained attention because of their rich physical properties, but their bulk ferroelectricity remains unexplored. Herein, by alloying flexible organic cations into the cubic CsPbBr3, we design the first cesium-based two-dimensional (2D) perovskite ferroelectric material with both inorganic alkali metal and organic cations, (C4H9NH3)(2)CsPb2Br7 (1). Strikingly, 1 shows a high Curie temperature (T-c=412K) above that of BaTiO3 (ca. 393K) and notable spontaneous polarization (ca. 4.2Ccm(-2)), triggered by not only the ordering of organic cations but also atomic displacement of inorganic Cs+ ions. To our knowledge, such a 2D bilayered Cs+-based metal-halide perovskite ferroelectric material with inorganic and organic cations is unprecedented. 1 also shows photoelectric semiconducting behavior with large "on/off" ratios of photoconductivity (>10(3)).
引用
收藏
页码:8140 / 8143
页数:4
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