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<p>Molecular pre-aggregation behavior plays a critical role in the morphology of organic films and the device performance of organic solar cells (OSCs). In the high-boiling-point solvent system, the relatively slow drying crystallization kinetics impacted the solution-state molecular pre-aggregation control, complicating the films crystallization regulation. In this work, a novel approach to regulate the pre-aggregation characteristics of the thin films was developed by constructing a droplet-merging and dissolution-induced intermediate state during inkjet printing (IJP). During this process, three key parameters, the printing temperature, droplet space, and additives, were identified to be critical for the intermediate state formation. This method created an intermediate aggregation state that finally enhanced the crystallization and molecular orientations in films printed from ortho-dichlorobenzene, overcoming the slow kinetics challenge. Consequently, IJP OSCs achieved a record power conversion efficiency of 17.57% through this droplet-merging and dissolution-induced intermediate strategy. </p>

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Droplet-Merging and Dissolution-Induced Intermediate State Strategy Enabled Efficiency > 17.5% for the Printed Organic Solar Cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Lifeng Sang,
  • Xingze Chen,
  • Chen Chen,
  • Yuanyuan Jiang,
  • Qing Zhang,
  • Ni Yin,
  • Yue Guo,
  • Wei Li,
  • Tao Wang,
  • Xiaozhang Zhu,
  • Qi Chen,
  • Chang-Qi Ma,
  • Qun Luo

摘要

Molecular pre-aggregation behavior plays a critical role in the morphology of organic films and the device performance of organic solar cells (OSCs). In the high-boiling-point solvent system, the relatively slow drying crystallization kinetics impacted the solution-state molecular pre-aggregation control, complicating the films crystallization regulation. In this work, a novel approach to regulate the pre-aggregation characteristics of the thin films was developed by constructing a droplet-merging and dissolution-induced intermediate state during inkjet printing (IJP). During this process, three key parameters, the printing temperature, droplet space, and additives, were identified to be critical for the intermediate state formation. This method created an intermediate aggregation state that finally enhanced the crystallization and molecular orientations in films printed from ortho-dichlorobenzene, overcoming the slow kinetics challenge. Consequently, IJP OSCs achieved a record power conversion efficiency of 17.57% through this droplet-merging and dissolution-induced intermediate strategy.