Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 27, Pages 8140-8143Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803716
Keywords
CsPbBr3; ferroelectric materials; perovskites; phase transitions; two-dimensional materials
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Funding
- NSFC [21525104, 21622108, 21601188, 91422301, 21571178, 51502288, 51502290]
- NSF for Distinguished Young Scholars of Fujian Province [2016J06012]
- NSF of Fujian Province [2015J05040]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Youth Innovation Promotion of CAS [2015240, 2016274]
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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)).
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