Achieving High Fill Factor in Organic Photovoltaic Cells by Tuning Molecular Electrostatic Potential Fluctuation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION(2024)
摘要
In the field of organic photovoltaics (OPVs), significant progress has been made in tailoring molecular structures to enhance the open-circuit voltage and the short-circuit current density. However, there remains a crucial gap in the development of coordinated material design strategies focused on improving the fill factor (FF). Here, we introduce a molecular design strategy that incorporates electrostatic potential fluctuation to design organic photovoltaic materials. By reducing the fluctuation amplitude of IT-4F, we synthesized a new acceptor named ITOC6-4F. When using PBQx-TF as a donor, the ITOC6-4F-based cell shows a markedly low recombination rate constant of 0.66x10-14 cm3 s-1 and demonstrates an outstanding FF of 0.816, both of which are new records for binary OPV cells. Also, we find that a small fluctuation amplitude could decrease the energetic disorder of OPV cells, reducing energy loss. Finally, the ITOC6-4F-based cell creates the highest efficiency of 16.0 % among medium-gap OPV cells. Our work holds a vital implication for guiding the design of high-performance OPV materials. We designed and synthesized an outstanding acceptor material, namely ITOC6-4F, characterized by a considerably low amplitude of electrostatic potential fluctuation (0.8 kcal/mol). The ITOC6-4F-based cell exhibits an extremely low bimolecular recombination rate constant of 0.66x10-14 cm3 s-1. Consequently, this has led to the attainment of a new record fill factor of 0.816 in binary organic photovoltaic cells. image
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关键词
electrostatic potential fluctuation,mid-band gap,organic photovoltaics,fill factor,recombination,energy loss
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