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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.