Ferroelectrics are an important class of functional materials. Its most remarkable feature is that the spontaneous polarization inside the material can change direction under external conditions (pressure, electric field, light, etc.). Compared with uniaxial ferroelectrics, multiaxial ferroelectrics have multiple equivalent polarization directions, making polarization reversal easier. In recent years, organic-inorganic hybrid perovskites have broad application prospects in the fields of photovoltaic devices, memory, sensors, etc. due to their rich physical characteristics. However, the realization of multi-axis ferroelectrics with photovoltaic effect based on hybrid perovskites is still an important issue to be solved.
The team of Luo Junhua, a researcher of inorganic optoelectronic functional crystal materials at the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, is supported by key projects of the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Strategic Pilot Project of the Chinese Academy of Sciences and the National Natural Science Foundation Youth Fund For the first time, a case of a two-dimensional three-layer organic-inorganic hybrid biaxial ferroelectric was constructed. The study found that the twisting of the inorganic octahedron and the ordering of the organic cations in the compound synergistically induced the ferroelectric spontaneous polarization of the compound; at the same time, the unique symmetry breaking of the compound (4 / mmmFmm2) made it have four Equivalent polarization direction. Further, based on its biaxial properties, the photovoltaic effect of the compound can be converted between multiple directions. This work not only provides a new strategy for the subsequent design of multiaxial ferroelectric materials by scientific researchers, but also further expands the research on the photovoltaic performance of inorganic-organic hybrid multiaxial ferroelectrics. The relevant research results were recently published in the form of communication In the Journal of the American Chemical Society (J. Am. Chem. Soc., 2019, 141, 7693–7697), Ph.D. student Wang Sasha is the first author of the paper.
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