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Acquiring High‐ T C Layered Metal Halide Ferroelectrics via Cage‐Confined Ethylamine Rotators
Author(s) -
Peng Yu,
Bie Jie,
Liu Xitao,
Li Lina,
Chen Shuang,
Fa Wei,
Wang Sasa,
Sun Zhihua,
Luo Junhua
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202011270
Subject(s) - ferroelectricity , halide , ethylamine , perovskite (structure) , cage , materials science , phase (matter) , condensed matter physics , curie temperature , phase transition , dielectric , nanotechnology , chemistry , crystallography , optoelectronics , physics , inorganic chemistry , ferromagnetism , organic chemistry , mathematics , combinatorics
Two‐dimensional (2D) organic–inorganic hybrid perovskite (OIHP) ferroelectrics have attracted widespread interest in the field of optoelectronics due to the combination of excellent semiconducting and ferroelectric properties. The Curie temperature ( T C ), below which ferroelectricity exists, is a crucial parameter for ferroelectrics. However, the lack of research on T C tuning of 2D OIHP ferroelectrics hinders their further progress. Here, through incorporating ethylammonium (EA) as cage‐confined rotators, we obtained two 2D OIHP ferroelectrics, (IBA) 2 (EA)Pb 2 Br 7 ( 2L ; IBA=isobutylammonium), and (IBA) 2 (EA) 2 Pb 3 Br 10 ( 3L ). Intriguingly, T C is successfully tuned from 326 K ( 2L ) to 370 K ( 3L ) with increasing layer thickness. Structural and computational analyses suggest that the improvement of T C is due to the higher phase‐transition energy barrier triggered by the cage‐confined EA rotators with increased layer thickness. This work suggests that EA is an effective “cage‐confined rotator” to rationally design high‐ T C 2D OIHP ferroelectrics.