Organic photovoltaic (OPV) battery is a green energy technology with major application prospects. In recent years, thanks to the development of new materials, the photovoltaic efficiency of OPV cells has been greatly improved, showing great practical application potential. Facing the industrialization of OPV technology and improving the photovoltaic performance of materials, we must pay attention to the control of the synthesis cost. In material design, the introduction of halogen atoms is the most common and effective molecular design method to effectively improve the basic characteristics of spectrum, energy level and aggregation morphology. At present, many preparation processes for high-efficiency feed and acceptor materials mostly include fluorination processes with long steps, low yields, and high costs, which seriously restricts the research and development process of mass production of organic photovoltaic materials.
With the support of the Beijing National Research Center for Molecular Sciences, the National Natural Science Foundation of China and the Ministry of Science and Technology, Hou Jianhui's research group of the Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences adopted a chlorination method to design high-performance organic photovoltaic materials and made a series of progress . In terms of polymer donors, the research team cooperated with Zhang Shaoqing, an associate professor at the University of Science and Technology Beijing, to replace the fluorine atom in the benzodithiophene (BDT) polymer PBDB-TF with a chlorine atom. Battery devices also exhibit higher photovoltaic efficiency (Adv. Mater. 2018, 30, e1800868); for non-fullerene receptors, the research group has significantly enhanced the introduction of dichlorocyanide indandione as an end group The intramolecular charge transfer effect is expanded, and the absorption range of the material is widened. The corresponding material has obtained excellent performance in various types of batteries (Adv. Mater. 2017, 29, 1703080; Sci. China Chem. 2018, 61, 1328-1337 ; Adv. Mater. 2018, 30, 1800613; Nat. Commun. 2019, 10, 2515). Recently, the research group systematically summarized the chlorine substitution modification methods of organic photovoltaic materials, and discussed in depth the relevant molecular design and photovoltaic characteristics. The relevant content was published in Acc. Chem. Res. 2020, 53, 4, 822-832. One author is associate researcher Yao Huifeng, and the corresponding author is researcher Hou Jianhui.
In the recent work, the research team prepared the new receptor BTP-eC9 by chlorination by meticulously optimizing the star receptor molecule Y6 that has recently appeared; this method improves the order of the molecular arrangement and promotes the charge Transmission, obtained the highest photovoltaic efficiency of 17.8% in a single cell, and was certified by the National Institute of Metrology (17.3%), proving the important role of the chlorine substitution modification method in the design of high-performance organic photovoltaic materials. The research team of Wei Zhixiang of the National Nanoscience Center and the peak research group of Linköping University in Sweden provided support for material morphology characterization and device physics. The related research work was published in the recent Advanced Materials. The corresponding author is Yao Huifeng and the first author is Cui Yong.
Figure: Optimization of receptor materials and device performance
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