Organic-inorganic hybrid perovskite has attracted extensive attention in the fields of solar cells, light-emitting diodes and lasers due to its rich physical and chemical properties. However, antiferroelectrics above room temperature based on hybrid perovskites have not yet been developed.
In a recent study published in the Journal of the American Chemical Society ("Above-Room-Temperature Antiferroelectric Discovered in Two-Dimensional Mixed Perovskite"), a research team led by Sunshine Zhihua and Professor Luo studied substances from the Fujian Junhua Institute (FJIRSM) The Chinese Academy of Sciences first constructed the Above-Room-Temperature Antiferroelectric energy storage efficiency based on two-dimensional organic-inorganic hybrid perovskite.
Schematic diagram of two-dimensional mixed perovskite antiferroelectricity. (Picture provided by Professor Luo's group)
The researchers found that the displacement of adjacent inorganic alkali metal Cs atoms and the orientation of organic cations in antiferroelectric compounds synergistically induce the generation of antiparallel dipoles.
At the same time, the antiferroelectricity of this compound exists in a wide range from room temperature to the Curie phase transition temperature (298-353 K) under the action of an external electric field.
In addition, they also found that the energy storage efficiency of this antiferroelectric material is as high as 69%, which is comparable to inorganic antiferroelectric ceramics.
The research results not only provide an idea for the design of new antiferroelectric materials, but also provide new ideas for the mechanism research and energy storage application of organic-inorganic hybrid antiferroelectric materials.
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