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<p>Printing of large-area solar panels necessitates advanced organic solar cells with thick active layers. However, increasing the active layer thickness typically leads to a marked drop in the power conversion efficiency. Here we developed an organic semiconductor regulator, called AT-β2O, to tune the crystallization sequence of the components in active layers. When adding AT-β2O in the donor (D18-Cl) and acceptor (N3) blend, N3 crystallizes behind D18-Cl, and this phenomenon is different from the co-crystallization observed in binary D18-Cl:N3 blends. This manipulation of crystallization dynamics is favourable to form bulk-heterojunction-gradient vertical phase separation in the active layer accompanied by the high crystallinity of the acceptor and balanced charge carrier mobilities in thick films. The resultant single-junction organic solar cells exhibited a certified power conversion efficiency of over 20%, as well as demonstrated exceptional adaptability across the active layer thicknesses (100–400 nm) and remarkable universality. Such breakthroughs enable large-area modules with a certified power conversion efficiency of 18.04%.</p>

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Organic solar cells with 20.82% efficiency and high tolerance of active layer thickness through crystallization sequence manipulation

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Haiyang Chen,
  • Yuting Huang,
  • Rui Zhang,
  • Hongyu Mou,
  • Junyuan Ding,
  • Jiadong Zhou,
  • Zukun Wang,
  • Hongxiang Li,
  • Weijie Chen,
  • Juan Zhu,
  • Qinrong Cheng,
  • Hao Gu,
  • Xiaoxiao Wu,
  • Tianjiao Zhang,
  • Yingyi Wang,
  • Haiming Zhu,
  • Zengqi Xie,
  • Feng Gao,
  • Yaowen Li,
  • Yongfang Li

摘要

Printing of large-area solar panels necessitates advanced organic solar cells with thick active layers. However, increasing the active layer thickness typically leads to a marked drop in the power conversion efficiency. Here we developed an organic semiconductor regulator, called AT-β2O, to tune the crystallization sequence of the components in active layers. When adding AT-β2O in the donor (D18-Cl) and acceptor (N3) blend, N3 crystallizes behind D18-Cl, and this phenomenon is different from the co-crystallization observed in binary D18-Cl:N3 blends. This manipulation of crystallization dynamics is favourable to form bulk-heterojunction-gradient vertical phase separation in the active layer accompanied by the high crystallinity of the acceptor and balanced charge carrier mobilities in thick films. The resultant single-junction organic solar cells exhibited a certified power conversion efficiency of over 20%, as well as demonstrated exceptional adaptability across the active layer thicknesses (100–400 nm) and remarkable universality. Such breakthroughs enable large-area modules with a certified power conversion efficiency of 18.04%.