JACS: Yao Huifeng, et al. From Hou Jianhui group, Institute of chemistry, Chinese Academy of Sciences, made important progress in the study of charge transfer mechanism in organic solar cells
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Last Update: 2019-07-27
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Source: Internet
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Author: User
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In recent years, the field of organic solar cell (OPV) has made rapid development, its photoelectric conversion efficiency has broken through 15%, showing a bright application prospect Understanding the mechanism of charge transfer in OPV, especially the driving force of exciton dissociation under low energy loss, is of great significance for designing novel materials to improve battery performance With the support of Chinese Academy of Sciences and NSFC, Yao Huifeng and others from Hou Jianhui research group of Institute of polymer physics and chemistry, Institute of chemistry, carried out the research on the structure-activity relationship between the chemical structure of organic photovoltaic molecules and the mechanism of charge generation In the previous work (chin J chem 2018, 36, 491-494), researchers found that there was a large difference between the molecular surface electrostatic potential (ESP) of electron donor and electron acceptor in OPV, which promoted the efficient generation of charge Recently, Yao Huifeng and others designed a novel polymer donor material PTO 2 and studied in detail the mechanism of the influence of the molecular surface ESP on the charge transfer process The results show that there is a significant ESP difference between PTO 2 and it-4f The corresponding intermolecular electric field provides the driving force of exciton dissociation and promotes the charge transfer Based on this, the battery has an efficient charge generation efficiency However, at the interface between PTO 2 and the receptor of fullerene derivatives, The difference of ESP is relatively small, and charge transfer needs the assistance of extra electric field In addition, the researchers have carried out corresponding research on devices and optical physics with partners from the University of Lin Xueping and Lund in Sweden, which is an important support for ESP theory This work established the relationship between molecular structure and charge transfer process, and provided a new idea for the design of high-efficiency photovoltaic materials The related research work was published in the recent J am Chem SOC (J am Chem SOC., 2019, 141, 7743-7750) The first author of this paper is Dr Yao Huifeng.
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