Achieving an ideal morphology to realize efficient charge generation and transport is an imperative avenue to improve the photovoltaic performance of all small-molecule organic solar cells (SM-OSCs). Here, ternary SM-OSCs are fabricated based on a new small molecule donor, SM-mB, and an alloyed blend acceptor of Y6 and its derivative, L8-BO, and desirable hierarchical morphology with appropriate nanoscale phase separation is successfully realized through adjusting the thermal annealing treatment conditions and compositions of mixed acceptors in the active layer. Then the ternary SM-OSCs achieve an excellent PCE of 17.06 %, which is one of the best results for the SM-OSCs so far. The desirable morphology can be ascribed to the optimization of the miscibility-driven donor and acceptor blend morphology that takes full advantage of the individual advantages of both acceptors, which facilitate efficient charge generation and extraction with more balanced charge carrier mobilities. More importantly, the photovoltaic performance of the ternary SM-OSCs possesses a high tolerance to the device fabrication conditions, including thermal annealing treatment, and is insensitive to film thickness, which is beneficial for large-area manufacture and future practical applications.

中文翻译：

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混溶性调节和热退火诱导的分级形态使高效率全小分子有机太阳能电池效率超过 17%

实现理想的形态以实现高效的电荷生成和传输是提高所有小分子有机太阳能电池（SM-OSC）光伏性能的必要途径。在此，基于新型小分子供体 SM-mB 和 Y6 及其衍生物 L8-BO 的合金共混受体制备了三元 SM-OSC，并通过调节参数成功实现了具有适当纳米级相分离的理想分级形态。热退火处理条件和有源层中混合受体的组成。然后，三元 SM-OSC 实现了 17.06% 的优异 PCE，这是迄今为止 SM-OSC 的最佳结果之一。理想的形态可归因于混溶性驱动的供体和受体共混形态的优化，该形态充分利用了两种受体的各自优势，从而促进有效的电荷生成和提取以及更平衡的载流子迁移率。更重要的是，三元SM-OSC的光伏性能对器件制造条件（包括热退火处理）具有较高的耐受性，并且对薄膜厚度不敏感，这有利于大面积制造和未来的实际应用。