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A Photoferroelectric Perovskite‐Type Organometallic Halide with Exceptional Anisotropy of Bulk Photovoltaic Effects
Author(s) -
Sun Zhihua,
Liu Xitao,
Khan Tariq,
Ji Chengmin,
Asghar Muhammad Adnan,
Zhao Sangen,
Li Lina,
Hong Maochun,
Luo Junhua
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201601933
Subject(s) - perovskite (structure) , photoexcitation , halide , photovoltaic system , anisotropy , optoelectronics , materials science , ferroelectricity , photoconductivity , photovoltaic effect , polarization (electrochemistry) , chemistry , inorganic chemistry , optics , crystallography , dielectric , excited state , physics , ecology , nuclear physics , biology
Abstract 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 PbBr 6 octahedra. Semiconducting 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 CH 3 NH 3 PbI 3 . 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.