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Research progress on all inorganic hybrid biaxial ferroelectric photovoltaic materials in Fujian
[ Instrument Network Instrument Development ] Ferroelectrics are an important class of functional materials. The 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, multi-axis ferroelectrics have multiple equivalent polarization directions, making polarization flipping easier.
In recent years, organic-inorganic hybrid perovskites have broad application prospects in photovoltaic devices, memories, sensors and other fields due to their rich physical properties. However, the realization of multi-axis ferroelectrics with photovoltaic effects based on hybrid perovskites is still an important issue to be solved.
The State Key Laboratory of Structural Chemistry of the Institute of Structural Physics of the Chinese Academy of Sciences, the Institute of Inorganic Optoelectronic Functional Crystal Materials, Luo Junhua, a team of researchers from the National Natural Science Foundation of China, the National Outstanding Youth Fund, the Strategic Pilot Program of the Chinese Academy of Sciences, and the National Natural Science Foundation of China, chaired by Associate Li Lina Under the project funding, a two-dimensional three-layer organic-inorganic hybrid biaxial ferroelectric was constructed for the first time.
It is found that the distortion of inorganic octahedron and the ordering of organic cations in the compound induce the ferroelectric spontaneous polarization of the compound; at the same time, the unique symmetry breaking of the compound (4/mmmFmm2) makes it have four Equivalent polarization direction. Further, based on its biaxial nature, the photovoltaic effect of the compound can be converted between multiple directions.
This work not only provides a new strategy for us to design multi-axis ferroelectric materials, but also further expands the research on the performance of inorganic-organic hybrid multi-axis ferroelectrics. The relevant research results have recently been published in the form of communication. At the American Chemical Society (J. Am. Chem. Soc., 2019, 141, 7693–7697), the Ph.D. student was the first author of the paper.