Research Progress on Two-photon Absorption of Bilayered Perovskite Ferroelectric Materials of Fujian Institute of Materials Science and Technology

Ferroelectric materials have attracted the attention of researchers because of their application in photovoltaics. Spontaneous polarization due to symmetry breaking in ferroelectrics facilitates the separation of photogenerated carriers, resulting in excellent photoconductivity and photovoltaic performance. Therefore, it is of great significance to study the interaction between light and matter (two-photon optical absorption) in ferroelectric materials. The two-photon absorption coefficient of traditional inorganic perovskite ferroelectric materials is generally small, and the development of organic-inorganic hybrid perovskites provides a new idea for designing novel ferroelectrics with excellent two-photon absorption properties.

Researcher Luo Junhua, a researcher at the National Key Laboratory of Structural Chemistry in the State Key Laboratory of Structural Chemistry of the Chinese Academy of Sciences, established a two-dimensional double-layer perovskite inorganic-organic hybrid ferroelectric by introducing mixed organic amine cations. It was found that the inorganic octahedron distortion and the disordered disorder of organic cations in the compound induced the ferroelectric spontaneous polarization of the compound; meanwhile, the compound exhibited a Curie temperature (322K) above the room temperature and obvious iron. Electrical spontaneous polarization. Research team of Chen Xueyuan, researcher of the Institute of Functional Nanostructure Design and Assembling Key Laboratory of Fujian Institute of Materials Structure, and researcher Wang Jun of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, found that the layered ferroelectric material exhibits good two-photon Absorption, with a two-photon absorption coefficient of up to 5.76 x 103 cm·GW-1. This study provides a new design strategy for the design of perovskite ferroelectrics with excellent two-photon absorption properties, and further expands the application of ferroelectric optical nonlinear absorption applications.

The relevant research results were published in the "American Journal of Chemistry". The first author is Li Lina, a research associate. This study was supported by the National Outstanding Youth Fund, the Strategic Pilot Project of the Chinese Academy of Sciences, the "Hundred Teams of People" project of the Chinese Academy of Sciences' Haixi Research Institute, the "Spring Miao Talent" project, and the National Natural Science Foundation of China's Excellent Youth Fund.

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