期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 40, 页码 12150-12154出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705836
关键词
ferroelectrics; hybrid perovskites; phase transitions; photodetectors; two-dimensional materials
资金
- National Natural Science Foundation of China [21622108, 21525104, 21601188, 91422301, 21373220, 51402296, 51502290]
- Natural Science Foundation of Fujian Province [2015J05040]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Youth Innovation Promotion of CAS [2014262, 2015240]
- State Key Laboratory of Luminescence and Applications [SKLA-2016-09]
Two-dimensional (2D) layered hybrid perovskites have shown great potential in optoelectronics, owing to their unique physical attributes. However, 2D hybrid perovskite ferroelectrics remain rare. The first hybrid ferroelectric with unusual 2D multilayered perovskite framework, (C4H9NH3)(2)(CH3NH3)(2)Pb3Br10 (1), has been constructed by tailored alloying of the mixed organic cations into 3D prototype of CH3NH3PbBr3. Ferroelectricity is created through molecular reorientation and synergic ordering of organic moieties, which are unprecedented for the known 2D multilayered hybrid perovskites. Single-crystal photodetectors of 1 exhibit fascinating performances, including extremely low dark currents (ca. 10(-12)A), large on/off current ratios (ca. 2.5x10(3)), and very fast response rate (ca. 150s). These merits are superior to integrated detectors of other 2D perovskites, and compete with the most active CH3NH3PbI3.
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