All-polymer solar cells (all-PSCs) have emerged as promising candidates for practical applications owing to their excellent stability and mechanical durability. Despite these merits, the device performance of all-PSCs still falls behind those based on small-molecule acceptors. The critical challenge lies in balancing and enhancing both the open-circuit voltage (V_OC) and the short-circuit current density (J_SC) in a synergistic manner. Herein, we designed an acceptor, PYO-V, with upshifted energy levels as well as blue-shifted absorption by linking alkoxy side chains on the β position of the outer thiophene units. The introduction of PYO-V into the PM6:PY-V-γ host system complements its absorption spectrum, improving its molecular packing, suppressing its charge recombination, and enhancing its polaron generation efficiency. Consequently, the resulting ternary all-PSCs with 20 wt% PYO-V achieved a significantly enhanced efficiency of 18.5%, which represents the highest value for reported all-PSCs with a V_OC of over 0.93 V. Moreover, the hypsochromic PYO-V also displays its versatile applications in indoor photovoltaics, as the PYO-V-based binary device achieves an efficiency of over 24%, among the best performance for indoor all-PSCs. This work presents an effective strategy for designing polymer acceptors with wider bandgaps for outdoor and indoor photovoltaic applications.

中文翻译：

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一种高效的烷氧基取代聚合物受体，适用于具有低电压损耗和多功能光伏应用的高效全聚合物太阳能电池


全聚合物太阳能电池（全PSC）由于其优异的稳定性和机械耐久性而成为实际应用的有希望的候选者。尽管有这些优点，全 PSC 的器件性能仍然落后于基于小分子受体的器件。关键的挑战在于以协同方式平衡和提高开路电压（V _OC ）和短路电流密度（J _SC ）。在此，我们设计了一种受体 PYO-V，通过在外部噻吩单元的 β 位上连接烷氧基侧链，具有上移的能级以及蓝移吸收。将PYO-V引入PM6:PY-V-γ主体系统可以补充其吸收光谱，改善其分子堆积，抑制其电荷复合，并提高其极化子产生效率。因此，所得到的含有 20 wt% PYO-V 的三元全 PSC 的效率显着提高了 18.5%，这是已报道的 V _OC 超过 0.93 V 的全 PSC 的最高值。此外，深色 PYO-V 还展示了其在室内光伏领域的多功能应用，基于 PYO-V 的二元器件实现了超过 24% 的效率，是室内全 PSC 的最佳性能之一。这项工作提出了一种有效的策略，为室外和室内光伏应用设计具有更宽带隙的聚合物受体。