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    Home > The research group of Professor Tao Xutang of Shandong University found that the band gap of tin-based organic-inorganic composite perovskite materials became narrow

    The research group of Professor Tao Xutang of Shandong University found that the band gap of tin-based organic-inorganic composite perovskite materials became narrow

    • Last Update: 2018-10-16
    • Source: Internet
    • Author: User
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    Recently, Professor Tao Xutang, State Key Laboratory of crystal materials, Shandong University, and Professor Osman M Bakr, King's University of science and technology, Saudi Arabia, jointly worked together to find a reversible self narrowing phenomenon of optical band gap of tin-based organic-inorganic composite perovskite materials, and revealed its self narrowing mechanism Relevant research results were published on the international famous journal angel Chem Int ed (DOI: 10.1002 / anie 201810481) under the title of "reversible band gap narrowing of Sn ‐ based hybrid perovskite single crystal with excellent phase stability" , Professor Tao Xutang is the corresponding author, Ju dianxing, a 2015 level doctoral student, is the first author, and Shandong University is the first author Organic-inorganic composite perovskite materials show potential application value in the fields of solar cells, photodetectors, light-emitting diodes and so on It is a hot research topic in the world at present Especially for solar cells, the photoelectric conversion efficiency of Perovskite Thin film solar cells certified by NREL has reached 23.3%, which surpasses the efficiency of monocrystalline silicon solar cells However, for most organic-inorganic composite perovskite materials, due to its large optical band gap, it can not be a good light absorbing material, which limits its application in solar cells Based on this scientific problem, Ju Dian Xing, under the guidance of Professor Tao Xutang, studied the dmasni 3 material, and found that the color of the material in the air gradually deepened, the optical band gap gradually narrowed, but the crystal structure remained unchanged By using X-ray diffraction, Raman spectrum, XPS and DFT calculation, they revealed the mechanism of band gap narrowing in dmasni 3 The narrowing of the band gap is not due to the oxidation of SN2 +, but due to the lack of diffusion of iodine ions, resulting in the formation of iodine vacancy defects in the materials In addition, after the band gap becomes narrow, the material returns to its original color in deionized water environment, which is reversible and has good water stability This study brings a new understanding to solve the problem of decomposition of organic-inorganic composite perovskite material in water This work is another important achievement published on angelw Chem Int ed 2016, 55, 3447, after Professor Tao Xutang's research group's research on the first growth of iodothronine perovskite single crystal (angelw Chem Int ed 2016, 55, 3447) The above related research has been greatly supported by the National Natural Science Foundation of China, the subject innovation and intelligence introduction program of colleges and universities and the State Key Laboratory of crystal materials.
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