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<p>Thick-film organic solar cells (OSCs) are critical for large-scale manufacturing, yet they face persistent challenges of severe energy loss and complex morphology control. The integration of molecular design and device engineering is widely recognized as a promising strategy to address these bottlenecks. Here, we report the synthesis of a fluoropolymer PF8 and its application in combination with fluorous solvent vapor annealing (FSVA) post-treatment to fabricate high-performance thick-film OSCs. The fluorination strategy and FSVA process synergistically enhance the polymer’s crystallinity and induce an intrinsic fibrous morphology. As a result, the FSVA-treated PF8:L8BO device with a thickness of 110 nm achieves a power conversion efficiency (PCE) of 18.89%. Notably, even when the film thickness is increased to 300 and 500 nm, the devices maintain high efficiencies of 17.54% and 15.59%, respectively. More importantly, the 300-nm FSVA-treated blend films exhibit enhanced packing order and well-defined fibrillar morphology, leading to suppressed non-radiative recombination and efficient charge transport along the fiber network. This study demonstrates the potential of combining fluoropolymers with fluorous solvent-based device engineering for advanced thick-film optoelectronic applications, providing a viable pathway for scalable OSC manufacturing.</p>

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High-crystallinity fluoropolymer collaborating fluorous solvent post-treatment for efficient thick-film organic solar cells

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Zhilong He,
  • Siyuan Li,
  • Zhe Hao,
  • Yi Lin,
  • Zheng Tang,
  • Hongliang Zhong

摘要

Thick-film organic solar cells (OSCs) are critical for large-scale manufacturing, yet they face persistent challenges of severe energy loss and complex morphology control. The integration of molecular design and device engineering is widely recognized as a promising strategy to address these bottlenecks. Here, we report the synthesis of a fluoropolymer PF8 and its application in combination with fluorous solvent vapor annealing (FSVA) post-treatment to fabricate high-performance thick-film OSCs. The fluorination strategy and FSVA process synergistically enhance the polymer’s crystallinity and induce an intrinsic fibrous morphology. As a result, the FSVA-treated PF8:L8BO device with a thickness of 110 nm achieves a power conversion efficiency (PCE) of 18.89%. Notably, even when the film thickness is increased to 300 and 500 nm, the devices maintain high efficiencies of 17.54% and 15.59%, respectively. More importantly, the 300-nm FSVA-treated blend films exhibit enhanced packing order and well-defined fibrillar morphology, leading to suppressed non-radiative recombination and efficient charge transport along the fiber network. This study demonstrates the potential of combining fluoropolymers with fluorous solvent-based device engineering for advanced thick-film optoelectronic applications, providing a viable pathway for scalable OSC manufacturing.