Integration of a third component into a single-junction polymer solar cell (PSC) is regarded as an attractive strategy to enhance the performance of PSCs. Although binary all-polymer solar cells (all-PSCs) have recently emerged with compelling power conversion efficiencies (PCEs), the PCEs of ternary all-PSCs still lag behind those of the state-of-the-art binary all-PSCs, and the advantages of ternary systems are not fully exploited. In this work, we realize high-performance ternary all-PSCs with record-breaking PCEs of 9% and high fill factors (FF) of over 0.7 for both conventional and inverted devices. The improved photovoltaic performance benefits from the synergistic effects of extended absorption, more efficient charge generation, optimal polymer orientations and suppressed recombination losses compared to the binary all-PSCs, as evidenced by a set of experimental techniques. The results provide new insights for developing high-performance ternary all-PSCs by choosing appropriate donor and acceptor polymers to overcome limitations in absorption, by affording good miscibility, and by benefiting from charge and energy transfer mechanisms for efficient charge generation.

中文翻译：

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三元全聚合物太阳能电池的功率转换效率为9.0％

将第三组分集成到单结聚合物太阳能电池（PSC）中被认为是增强PSC性能的一种有吸引力的策略。尽管二元全聚合物太阳能电池（all-PSC）最近以令人信服的功率转换效率（PCE）出现，但三元全PSC的PCE仍然落后于最新的二元全PSC，并且三元系统的优势尚未得到充分利用。在这项工作中，我们实现了高性能三元全PSC，其中破纪录的PCE达到9％，传统和倒装器件的高填充因子（FF）都超过0.7。与二元全PSC相比，改善的光伏性能得益于扩展吸收，更高效的电荷产生，最佳的聚合物取向和抑制的重组损失的协同效应，正如一组实验技术所证明的那样。通过选择合适的供体和受体聚合物以克服吸收方面的限制，提供良好的可混溶性以及受益于电荷和能量转移机制以高效生成电荷，这些结果为开发高性能三元全PSC提供了新的见识。