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<p>The pursuit of simple yet high-performance materials is important for advancing organic photovoltaics, though structurally simple polymer donors typically underperform. This study reveals precise control over polymer aggregation and donor-acceptor compatibility is key to optimizing active layer morphology. We design three linear conjugated polymers with systematically chlorinated backbones to finely modulate aggregation tendency and surface tension. This strategy concurrently regulates film-formation kinetics and donor-acceptor compatibility. PTTz-Cl50 exhibits ideal aggregation and optimal compatibility with BTP-eC9, enabling sequential deposition that forms a bicontinuous interpenetrating network with appropriate domain size and marked phase purity. This microstructure provides sufficient interfacial area for exciton dissociation while retaining high-purity charge transport pathways. Consequently, the device demonstrates rapid exciton dissociation, efficient charge transport, and suppressed recombination, enhancing both short-circuit current and fill factor. This yield a high power conversion efficiency of 20.42% for linear conjugated polymers, underscoring the promise of low-cost materials for efficient devices.</p>

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Chlorination-controlled aggregation and film-formation kinetics enabling high-efficiency organic solar cells with low-cost linear conjugated polymers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月4日

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  • Bingyan Yin,
  • Zhili Chen,
  • Baoqi Wu,
  • Xiyue Yuan,
  • Cong Xiao,
  • Xia Zhou,
  • Jianbin Zhong,
  • Seunglok Lee,
  • Wei Chen,
  • Lifu Zhang,
  • Liming Wang,
  • Guangye Zhang,
  • Wei Zhang,
  • Changduk Yang,
  • Zhitian Liu,
  • Fei Huang,
  • Yong Cao,
  • Chunhui Duan

摘要

The pursuit of simple yet high-performance materials is important for advancing organic photovoltaics, though structurally simple polymer donors typically underperform. This study reveals precise control over polymer aggregation and donor-acceptor compatibility is key to optimizing active layer morphology. We design three linear conjugated polymers with systematically chlorinated backbones to finely modulate aggregation tendency and surface tension. This strategy concurrently regulates film-formation kinetics and donor-acceptor compatibility. PTTz-Cl50 exhibits ideal aggregation and optimal compatibility with BTP-eC9, enabling sequential deposition that forms a bicontinuous interpenetrating network with appropriate domain size and marked phase purity. This microstructure provides sufficient interfacial area for exciton dissociation while retaining high-purity charge transport pathways. Consequently, the device demonstrates rapid exciton dissociation, efficient charge transport, and suppressed recombination, enhancing both short-circuit current and fill factor. This yield a high power conversion efficiency of 20.42% for linear conjugated polymers, underscoring the promise of low-cost materials for efficient devices.