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As an important part of photoelectric functional materials, polar crystals have broad application prospects in nonlinear optics, piezoelectric devices, pyroelectric detectors, and ferroelectric information storage. Spontaneous polarization is the essential core of polar crystal materials. Designing and assembling compounds with strong polarization effect is an effective way to develop photoelectric functional crystal materials.
State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and Researcher Luo Junhua, Researcher of Inorganic Optoelectronic Functional Crystal Materials, led by the National Institute for the Study of Structure Chemistry, Institute of Material Structures, Chinese Academy of Sciences; National Institute for Distinguished Young Scientists Fund, Chinese Academy of Sciences Strategic Pilot Science and Technology Project, Hercynian Research Under the auspices of Sun Zhihua, a researcher at the Institute’s "100-member team," the Haixi Research Institute of the Chinese Academy of Sciences and the Outstanding Young Scientists Fund of Fujian Province, and under the support of a project funded by the phase transition induced polarization effect, a perovskite-like structure was built. Structural polar compounds.
In the structural composition of the crystal material, the inorganic metal skeleton exhibits a zero-dimensional perovskite structure along the <111> direction, and the configuration distortion occurs during the phase transition; the organic cation generates an disorder-ordered structure. Changes, mutual cooperation between the induced materials produce a strong spontaneous polarization effect. With the application of an external electric field, the spontaneous polarization of the material can be reversed, showing obvious ferroelectric properties; further studies have also found that the compound exhibits temperature-dependent conductivity and semiconductor properties such as photoconductivity. The relevant research results are published in "Angew. Chem., Int. Ed. 2016, DOI: 10.1002/anie.201606079". As a ferroelectric semiconductor material, the successful preparation of the polar compound will expand the potential application of inorganic-organic hybrid materials in solar cells, photoelectric detection and the like. Previously, the research team designed an inorganic-organic hybrid ferroelectric photovoltaic crystal material based on the design strategy of solid phase transition symmetry-induced breakage-induced polarization (Angew. Chem., Int. Ed., 2016, 55, 6545).
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