Even though significant breakthroughs with over 18% power conversion efficiencies (PCEs) in polymer:non‐fullerene acceptor (NFA) bulk heterojunction organic solar cells (OSCs) have been achieved, not many studies have focused on acquiring a comprehensive understanding of the underlying mechanisms governing these systems. This is because it can be challenging to delineate device photophysics in polymer:NFA blends comprehensively, and even more complicated to trace the origins of the differences in device photophysics to the subtle differences in energetics and morphology. Here, a systematic study of a series of polymer:NFA blends is conducted to unify and correlate the cumulative effects of i) voltage losses, ii) charge generation efficiencies, iii) non‐geminate recombination and extraction dynamics, and iv) nuanced morphological differences with device performances. Most importantly, a deconvolution of the major loss processes in polymer:NFA blends and their connections to the complex BHJ morphology and energetics are established. An extension to advanced morphological techniques, such as solid‐state NMR (for atomic level insights on the local ordering and donor:acceptor ππ interactions) and resonant soft X‐ray scattering (for donor and acceptor interfacial area and domain spacings), provide detailed insights on how efficient charge generation, transport, and extraction processes can outweigh increased voltage losses to yield high PCEs.

中文翻译：

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统一低偏移量非富勒烯受体有机太阳能电池中的电荷产生，重组和提取

尽管在聚合物：非富勒烯受体（NFA）本体异质结有机太阳能电池（OSC）方面实现了超过18％的功率转换效率（PCE）的重大突破，但很少有研究致力于获得对基本机理的全面理解管理这些系统。这是因为在聚合物：NFA的全面混合中描绘装置光物理存在挑战，而要追踪装置光物理中差异的起因到能量学和形态上的细微差异，则变得更加复杂。在此，我们对一系列聚合物：NFA混合物进行了系统研究，以统一并关联i）电压损失，ii）电荷产生效率，iii）非双键重组和萃取动力学，iv）器件性能上细微的形态差异。最重要的是，建立了聚合物：NFA共混物中主要损失过程的反卷积，以及它们与复杂的BHJ形态和能量学的联系。对高级形态学技术（例如固态NMR）的扩展（用于原子级洞察局部定序和施主：受主π）π相互作用）和共振软X射线散射（用于供体和受体界面面积和畴间距），提供了有关有效电荷产生，传输和提取过程如何能够抵消增加的电压损耗以产生高PCE的详细见解。