Chlorine substitution, as an effective and low-cost modification strategy, has been applied in the design of donor and acceptor structures in organic solar cells. We synthesized a series of chlorinated dimerized acceptors to investigate the effect of chlorine numbers and locations on the photovoltaic properties. The results show that the planarity and morphology of DYV-γ-2Cl are greatly improved due to the appropriate numbers and positions of the substituted chlorine atoms. Therefore, the device based on PM6:DYV-γ-2Cl achieves a superior power conversion efficiency (PCE) of 15.54% among the three oligomeric acceptors with optimized molecular planarity and film morphology. This work demonstrated the positive effect of suitable numbers and the substitution positions of chlorines on the molecular arrangement and photovoltaic properties of the corresponding dimerized acceptors.

中文翻译：

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具有调节平面度的氯化低聚物可实现卓越的光伏性能


氯替代作为一种有效且低成本的修饰策略，已应用于有机太阳能电池的供体和受体结构的设计。我们合成了一系列氯化二聚受体，以研究氯数量和位置对光伏性能的影响。结果表明，由于取代氯原子的数量和位置适当，DYV-γ-2Cl的平面性和形貌得到了极大的改善。因此，基于PM6:DYV-γ-2Cl的器件在具有优化的分子平面度和薄膜形貌的三种低聚物受体中实现了15.54%的优异功率转换效率（PCE）。这项工作证明了适当的氯数量和取代位置对相应二聚受体的分子排列和光伏性能的积极影响。