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Fluorinated 2D Lead Iodide Perovskite Ferroelectrics
Author(s) -
Sha TaiTing,
Xiong YuAn,
Pan Qiang,
Chen XiaoGang,
Song XianJiang,
Yao Jie,
Miao ShuRong,
Jing ZhengYin,
Feng ZiJie,
You YuMeng,
Xiong RenGen
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201901843
Subject(s) - ferroelectricity , perovskite (structure) , materials science , iodide , halide , photoluminescence , polarization (electrochemistry) , photovoltaics , optoelectronics , band gap , nanotechnology , dielectric , photovoltaic system , chemical engineering , inorganic chemistry , chemistry , electrical engineering , engineering
Hybrid perovskite materials are famous for their great application potential in photovoltaics and optoelectronics. Among them, lead‐iodide‐based perovskites receive great attention because of their good optical absorption ability and excellent electrical transport properties. Although many believe the ferroelectric photovoltaic effect (FEPV) plays a crucial role for the high conversion efficiency, the ferroelectricity in CH 3 NH 3 PbI 3 is still under debate, and obtaining ferroelectric lead iodide perovskites is still challenging. In order to avoid the randomness and blindness in the conventional method of searching for perovskite ferroelectrics, a design strategy of fluorine modification is developed. As a demonstration, a nonpolar lead iodide perovskite is modified and a new 2D fluorinated layered hybrid perovskite material of (4,4‐difluorocyclohexylammonium) 2 PbI 4 , 1 , is obtained, which possesses clear ferroelectricity with controllable spontaneous polarization. The direct bandgap of 2.38 eV with strong photoluminescence also guarantees the direct observation of polarization‐induced FEPV. More importantly, the 2D structure and fluorination are also expected to achieve both good stability and charge transport properties. 1 is not only a 2D fluorinated lead iodide perovskite with confirmed ferroelectricity, but also a great platform for studying the effect of ferroelectricity and FEPV in the context of lead halide perovskite solar cells and other optoelectronic applications.