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    Home > Important progress has been made in perovskite single crystal research by the research group of academician Tian Zhongqun and Professor Mao Bingwei of Xiamen University

    Important progress has been made in perovskite single crystal research by the research group of academician Tian Zhongqun and Professor Mao Bingwei of Xiamen University

    • Last Update: 2019-02-16
    • Source: Internet
    • Author: User
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    Recently, the research group of academician Tian Zhongqun of School of chemistry and chemical engineering of Xiamen University and the research group of Professor Mao Bingwei have made important progress in the research of long-term stability of perovskite materials The results were published in J am Chem SOC (DOI: 10.1021 / JACS 8b11610) Perovskite solar cell is one of the research hotspots in chemistry, materials, energy and other fields in recent years Because of its high photoelectric conversion efficiency and low cost, the industrialization of perovskite solar cells has a bright future However, the long-term stability of perovskite solar cells is the bottleneck of its application compared with the service life of silicon-based solar cells over 20 years In order to study the long-term stability of perovskite under the conditions of light, heat and water oxygen, a series of high-quality single crystal alloys containing cesium mixed cations and mixed halogen perovskite were prepared Single crystal system can effectively eliminate the influence of complex grain boundary, interface and interface materials on the stability of perovskite solar cells, and can reflect the long-term intrinsic stability of perovskite materials When the cesium content reaches 10% or the bromine content reaches 15%, two kinds of phase separation will occur under the action of water and oxygen, and the cation has a synergistic effect on the phase separation of anions For this reason, a new perovskite component with high stability has been optimized: it still has excellent structural stability in the test of water oxygen stability of 10000h and optical stability of 1000h At the same time, this component has a carrier lifetime of up to 16 μ s, which is expected to be a new component for the preparation of high efficiency and stable perovskite solar cells Through the analysis of single crystal structure, the author further revealed the internal reason for the high stability of this component This work provides new research ideas and methods for guiding and finding more stable perovskite materials Chen Liang, a direct doctoral student in 2013 and Tan Yanyan, a master's student in 2016 from the school of chemistry and chemical engineering of Xiamen University, are the co authors of this study Dr Chen Zhixin and Dr Nan Ziang from the collaborative innovation center of energy materials chemistry have greatly helped in the measurement and analysis of single crystal structure Professor Zhou Jianzhang and Professor Yan Jiawei of the school of chemistry and chemical engineering gave guidance and help in the experiment The research was supported by the National Natural Science Foundation of China (project approval No.: 21621091, 21473147) and the key R & D plan of the Ministry of science and Technology (project approval No.: 2016yfa02007003).
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