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Discovery of an Above-Room-Temperature Antiferroelectric in Two-Dimensional Hybrid Perovskite

Wu, Zhenyue, Liu, Xitao, Ji, Chengmin, Li, Lina, Wang, Sasa, Peng, Yu, Tao, Kewen, Sun, Zhihua, Hong, Maochun, Luo, Junhua
Journal of the American Chemical Society 2019 v.141 no.9 pp. 3812-3816
cations, ceramics, electric field, electronic equipment, energy, hysteresis, temperature
Antiferroelectric materials have been regarded as a promising candidate for electronic energy storage devices, due to their natural double polarization versus electric field (P–E) hysteresis loops. Currently, two-dimensional organic–inorganic hybrid perovskites with structural diversity and tunability, have received blooming interests, whereas above-room-temperature antiferroelectrics are still unreported in this perovskite system. Herein, for the first time, we successfully acquire a two-dimensional Ruddlesden–Popper hybrid perovskite antiferroelectric, ((CH₃)₂CHCH₂NH₃)₂CsPb₂Br₇ (1), which shows an above-room-temperature Curie temperature at 353 K, trigging by the synergistic dynamic motion of inorganic Cs atoms and organic isobutylammonium cations. Intriguingly, the antiferroelectricity of 1 existing over a wide temperature range of 298–353 K are revealed by the distinct double P–E hysteresis loops. Besides, 1 possesses remarkable energy storage efficiency up to 69%, comparable to those of some reported inorganic antiferroelectric ceramics, promoting 1 potential application in energy storage devices. This work provides an avenue to construct novel antiferroelectric materials for high-performance electronic device applications.