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<p>Polymer acceptor configuration and aggregation behavior are critical in determining the photovoltaic performance of all-polymer solar cells (all-PSCs). Effectively manipulating polymer self-aggregation through structural design to optimize the blend morphology remains challenging. Herein, we present a simple yet effective design strategy to modulate the aggregation behavior of the Y-series-based polymer acceptor PY-V-<i>γ</i> by introducing a pendant-fluorinated Y-series acceptor (Y2F-ET) into the main-conjugated backbone. Two random copolymer acceptors (PY-EY-5 and PY-EY-20) were synthesized with varying molar fractions of Y2F-ET pendant monomers. Our findings revealed that both the solution-phase and solid-state aggregation behaviors were progressively suppressed as the Y2F-ET content increased. Compared to the highly self-aggregating PY-V-<i>γ</i>-based all-PSCs, the more amorphous PY-EY-5 enabled devices to achieve an increased device efficiency from 17.31% to 18.45%, which is attributed to the slightly smaller polymer phase-separation domain sizes and reduced molecular aggregation in the PM6:PY-EY-5 blend. Moreover, the finely tuned blend morphology exhibited superior thermal stability, underscoring the significant advantages of the Y-series pendant random copolymerization approach.</p>

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Pendant Y-series Acceptors with Well-controlled Morphology Enabled High Performance and Stability All-polymer Solar Cells

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Hao-Yong Shi,
  • Lu Xing,
  • Ming-Xia Chen,
  • Zhi-Yi Chen,
  • Ming-Wei Deng,
  • Lin-Yong Xu,
  • Xiao-Hei Wu,
  • Xin-Rong Yang,
  • Yi-Ming Shao,
  • Elizaveta D. Papkovskaya,
  • Yuriy Luponosov,
  • Rui Sun,
  • Jie Min

摘要

Polymer acceptor configuration and aggregation behavior are critical in determining the photovoltaic performance of all-polymer solar cells (all-PSCs). Effectively manipulating polymer self-aggregation through structural design to optimize the blend morphology remains challenging. Herein, we present a simple yet effective design strategy to modulate the aggregation behavior of the Y-series-based polymer acceptor PY-V-γ by introducing a pendant-fluorinated Y-series acceptor (Y2F-ET) into the main-conjugated backbone. Two random copolymer acceptors (PY-EY-5 and PY-EY-20) were synthesized with varying molar fractions of Y2F-ET pendant monomers. Our findings revealed that both the solution-phase and solid-state aggregation behaviors were progressively suppressed as the Y2F-ET content increased. Compared to the highly self-aggregating PY-V-γ-based all-PSCs, the more amorphous PY-EY-5 enabled devices to achieve an increased device efficiency from 17.31% to 18.45%, which is attributed to the slightly smaller polymer phase-separation domain sizes and reduced molecular aggregation in the PM6:PY-EY-5 blend. Moreover, the finely tuned blend morphology exhibited superior thermal stability, underscoring the significant advantages of the Y-series pendant random copolymerization approach.