Polarized photoelectric detection has a wide range of applications in medical, environmental and other fields, and two-dimensional structural materials are one of the important material carriers to achieve this function. Among them, the two-dimensional organic-inorganic hybrid ferroelectric not only exhibits strong structural anisotropy, but also the built-in electric field formed by the spontaneous polarization of the ferroelectric facilitates the separation of photogenerated carriers, and has unique advantages in polarized photoelectric detection. However, the realization of high-efficiency solar-blind ultraviolet photodetection based on two-dimensional hybrid optical ferroelectric semiconductors is still an important problem to be solved.
Luo Junhua, a researcher at the State Key Laboratory of Structural Chemistry, Fujian Institute of the Structure of Matter, Chinese Academy of Sciences, and his team developed a new system of two-dimensional hybrid optoferroelectric semiconductor materials (A')n-1(A)2MnX3n+1 using the "dimensionality reduction design strategy" . Using the three-dimensional perovskite structure framework as a template, a wide band gap (Eg=3.35) two-dimensional photoferroelectric semiconductor compound is obtained by introducing organic ligands; the organic ligands and inorganic frameworks are alternately arranged to form a two-dimensional quantum well structure. Endow compounds with strong anisotropic optical, electrical and photoelectric response characteristics. At the same time, the built-in electric field formed by ferroelectric polarization can promote the separation of photogenerated carriers, which is beneficial to improve the performance of the device. Devices assembled based on ferroelectric single crystals exhibit good polarization response in the solar-blind ultraviolet region, and have a high photo-dark current ratio and dichroic ratio. This work provides a new synthesis strategy for the subsequent design of two-dimensional optical ferroelectric semiconductor compounds with a wide band gap, which will further expand the application range of this series of materials.
Related research results were published in "Germany Applied Chemistry". The research work has been funded by the National Outstanding Youth Fund, the Chinese Academy of Sciences Strategic Leading Science and Technology Project and other projects.
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