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    Home > Chemical Science: Professor Wu Yongzhen and Professor Zhu Weihong of East China University of science and technology have made progress in the field of perovskite solar cell hole transport materials

    Chemical Science: Professor Wu Yongzhen and Professor Zhu Weihong of East China University of science and technology have made progress in the field of perovskite solar cell hole transport materials

    • Last Update: 2018-07-31
    • Source: Internet
    • Author: User
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    Recently, Professor Wu Yongzhen and Professor Zhu Weihong from the school of chemistry and molecular engineering of East China University of science and technology have made progress in the field of perovskite solar cell hole transport materials (HTMs) Their relevant research work is "low cost and stable quinoxaline based transport materials with a D – a – D molecular configuration for efficient perovskite solar cells" It is reported online by chemical science, an international well-known chemical journal The hole transport layer of perovskite solar cell can promote the extraction and collection of photogenerated charge, and protect the absorption layer At present, 2,2 ', 7,7' - Tetra [n, N-bis (4-methoxyphenyl) amino] - 9,9 '- spiro-OMeTAD is commonly used in perovskite solar cells Its high cost is one of the bottlenecks restricting the practical application of perovskite solar cells Part of the research work shows that the synthesis route can be simplified and the cost can be reduced by replacing the complex spiroflurane core with simple π bridge and constructing donor π bridge donor (D π d) type HTMs However, the electron rich nature of π - bridge will raise the energy level of Homo and decrease its intrinsic stability By introducing the quinoxaline unit with weak electron absorption, the researchers constructed the donor receptor donor (D-A-D) type of HTM, reasonably regulated the HOMO energy level of HTM, and optimized the arrangement of interface energy band of perovskite solar cell devices Compared with spiro ometad, this kind of d-a-d-type HTM has better photostability, the thermal decomposition temperature is increased by 30oC, and the synthesis cost is reduced by 30 times The perovskite solar cell devices prepared by thiophene substituted HTM tq2 have achieved a photoelectric conversion efficiency of 19.62%, which is better than reference compound spiro ometad (18.54%) and benzene substituted HTM tq1 (14.27%) The fluorescence lifetime characterization and conductivity test show that the thiophene substituted HTMs have better hole extraction and transport ability Through single crystal analysis, it is found that there are S-S and s-π interactions between tq2 molecules, which shorten the distance between the triphenylamine units and increase the hole transport channel This work provides a new idea for the design of hole transport layer of perovskite solar cells with low cost and high performance The thesis was completed by Zhang Hao, a doctoral student, under the guidance of Professor Zhu Weihong and Professor Wu Yongzhen, and was carefully guided by academician Tian He The related work has been supported by the innovation research group project of NSFC, the key project of NSFC, Shanghai Oriental Scholars talent plan, the "young talents trust project" of China Chemical Society and the special fund for basic scientific research of Central University.
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