期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 39, 页码 11854-11858出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201606079
关键词
band gap; ferroelectrics; perovskite hybrids; phase transitions; semiconducting properties
资金
- NSFC [21525104, 91422301, 21373220, 51402296, 21571178, 51502288, 51502290, 21301172]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- NSF for Distinguished Young Scholars of Fujian Province [2014J06015]
- Youth Innovation Promotion of CAS [2014262]
- Chunmiao Projects of Haixi Institute of CAS [CMZX-2013-002]
- UCAS
Perovskite lead halides (CH3NH3PbI3) have recently taken a promising position in photovoltaics and optoelectronics because of remarkable semiconducting properties and possible ferroelectricity. However, the potential toxicity of lead arouses great environmental concern for widespread application. A new chemically tailored lead-free semiconducting hybrid ferroelectric is reported, N-methylpyrrolidinium)(3)Sb2Br9 (1), which consists of a zero-dimensional (0-D) perovskite-like anionic framework connected by cornersharing SbBr6 coordinated octahedra. It presents a large ferroelectric spontaneous polarization of approximately 7.6 mu C cm(-2), as well as notable semiconducting properties, including positive temperature-dependent conductivity and ultraviolet-sensitive photoconductivity. Theoretical analysis of electronic structure and energy gap discloses a dominant contribution of the 0-D perovskite-like structure to the semiconducting properties of the material. This finding throws light on the rational design of new perovskite-like hybrids, especially lead-free semiconducting ferroelectrics.
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