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<p>In this study, a polymer acceptor named BT-Cl with a “bridging” structure, which contained a benzodithiophene unit analogous to that of donor D18, and cyano (CN) groups and heterocyclic structures similar to those in acceptor N3, was synthesized. The “bridging” structure ensured good compatibility of BT-Cl with both D18 and N3, and effectively helped to reduce the large phase separation size of D18/N3 binary blend film when added as a third component. Meanwhile, the addition of BT-Cl to the D18/N3 blend can improve the crystallinity and enhance the light absorption efficiency to some extent. The “bridging” structure also resulted higher lowest unoccupied molecular orbital (LUMO) energy level of BT-Cl than that of N3, which effectively improve the open-circuit voltage (<i>V</i><sub>OC</sub>) of the ternary device and consequently the power conversion efficiency (PCE). This work showed that the polymer with “bridging” structure as the third component was an effective strategy to decrease the large phase separation size.</p>

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“Bridging” Structure Polymer Strategy for Morphology Regulation and Performance Optimization of Organic Solar Cells Based on the Ternary-component Polymer

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Wan-Peng Zhang,
  • Miao-Miao Liu,
  • Meng-Ran Fu,
  • Die Gao,
  • Qiao-Qiao Zhao,
  • Biao Xiao,
  • Ting-Xing Zhao

摘要

In this study, a polymer acceptor named BT-Cl with a “bridging” structure, which contained a benzodithiophene unit analogous to that of donor D18, and cyano (CN) groups and heterocyclic structures similar to those in acceptor N3, was synthesized. The “bridging” structure ensured good compatibility of BT-Cl with both D18 and N3, and effectively helped to reduce the large phase separation size of D18/N3 binary blend film when added as a third component. Meanwhile, the addition of BT-Cl to the D18/N3 blend can improve the crystallinity and enhance the light absorption efficiency to some extent. The “bridging” structure also resulted higher lowest unoccupied molecular orbital (LUMO) energy level of BT-Cl than that of N3, which effectively improve the open-circuit voltage (VOC) of the ternary device and consequently the power conversion efficiency (PCE). This work showed that the polymer with “bridging” structure as the third component was an effective strategy to decrease the large phase separation size.