The variation of the vertical component distribution can significantly influence the photovoltaic performance of organic solar cells (OSCs), mainly due to its impact on exciton dissociation and charge-carrier transport and recombination. Herein, binary devices are fabricated via sequential deposition (SD) of D18 and L8-BO materials in a two-step process. Upon independently regulating the spin-coating speeds of each layer deposition, the optimal SD device shows a record power conversion efficiency (PCE) of 19.05% for binary single-junction OSCs, much higher than that of the corresponding blend casting (BC) device (18.14%). Impressively, this strategy presents excellent universality in boosting the photovoltaic performance of SD devices, exemplified by several nonfullerene acceptor systems. The mechanism studies reveal that the SD device with preferred vertical components distribution possesses high crystallinity, efficient exciton splitting, low energy loss, and balanced charge transport, resulting in all-around enhancement of photovoltaic performances. This work provides a valuable approach for high-efficiency OSCs, shedding light on understanding the relationship between photovoltaic performance and vertical component distribution.

中文翻译：

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二元有机太阳能电池通过操纵垂直组件分布突破 19%

垂直分量分布的变化可以显着影响有机太阳能电池（OSC）的光伏性能，主要是由于其对激子解离和电荷载流子传输和重组的影响。在此，二元器件是通过 D18 和 L8-BO 材料的连续沉积 (SD) 在两步工艺中制造的。在独立调节每层沉积的旋涂速度后，最佳的 SD 器件显示出二元单结 OSC 的创纪录的 19.05% 的功率转换效率 (PCE)，远高于相应的混合铸造 (BC) 器件。 18.14%）。令人印象深刻的是，这种策略在提高 SD 器件的光伏性能方面表现出极好的普遍性，例如几个非富勒烯受体系统。机理研究表明，具有优选垂直成分分布的SD器件具有高结晶度、高效的激子分裂、低能量损失和平衡的电荷传输，从而全面提高光伏性能。这项工作为高效 OSC 提供了一种有价值的方法，有助于理解光伏性能与垂直组件分布之间的关系。