Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 22, Pages 6545-6550Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201601933
Keywords
ferroelectric materials; organometallic halides; perovskite; photovoltaic effects
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Funding
- NSFC [21525104, 91422301, 21373220, 51402296, 21571178, 51502288, 51502290, 21301172]
- NSF for Distinguished Young Scholars of Fujian Province [2014J06015]
- NSF of Fujian Province [2014J01067, 2014J05068, 2015J05040]
- Youth Innovation Promotion of CAS [2014262, 2015240, 2016274]
- Chunmiao Projects of Haixi Institute of Chinese Academy of Sciences [CMZX-2013-002, CMZX-2015-003]
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Perovskite-type ferroelectrics composed of organometallic halides are emerging as a promising alternative to conventional photovoltaic devices because of their unique photovoltaic effects (PVEs). A new layered perovskite-type photoferroelectric, bis(cyclohexylaminium) tetrabromo lead (1), is presented. The material exhibits an exceptional anisotropy of bulk PVEs. Upon photoexcitation, superior photovoltaic behaviors are created along its inorganic layers, which are composed of corner-sharing PbBr6 octahedra. Semi-conducting activity with remarkable photoconductivity is achieved in the vertical direction, showing sizeable on/off current ratios (>10(4)), which compete with the most active photovoltaic material CH3NH3PbI3. In 1 the temperature-dependence of photovoltage coincides fairly well with that of polarization, confirming the dominant role of ferroelectricity in such highly anisotropic PVEs. This finding sheds light on bulk PVEs in ferroelectric materials, and promotes their application in optoelectronic devices.
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