The energy loss induced open-circuit voltage (V_OC) deficit hampers the rapid development of state-of-the-art organic solar cells (OSCs), therefore, it is extremely urgent to explore effective strategies to address this issue. Herein, a new volatile solid additive 1,4-bis(iodomethyl)cyclohexane (DIMCH) featured with concentrated electrostatic potential distribution is utilized to act as a morphology-directing guest to reduce energy loss in multiple state-of-art blend system, leading to one of highest efficiency (18.8%) at the forefront of reported binary OSCs. Volatile DIMCH decreases radiative/non-radiative recombination induced energy loss (ΔE₂/ΔE₃) by rationally balancing the crystallinity of donors and acceptors and realizing homogeneous network structure of crystal domain with reduced D–A phase separation during the film formation process and weakens energy disorder and trap density in OSCs. It is believed that this study brings not only a profound understanding of emerging volatile solid additives but also a new hope to further reduce energy loss and improve the performance of OSCs.

中文翻译：

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通过挥发性固体添加剂策略解决有机太阳能电池的能量损失

能量损失引起的开路电压（_VOC）不足阻碍了最先进的有机太阳能电池（OSC）的快速发展，因此，探索有效的策略来解决这个问题迫在眉睫。在此，利用具有集中静电势分布的新型挥发性固体添加剂1,4-双（碘甲基）环己烷（DIMCH）作为形态引导客体，以减少多种最先进的共混体系中的能量损失，领先达到已报道的二元 OSC 中最高效率之一 (18.8%)。挥发性DIMCH通过合理平衡施主和受主的结晶度，实现晶域的均匀网络结构，减少成膜过程中的D-A相分离_，从而减少辐射/非辐射复合引起的能量损失（Δ E ₂ /Δ E 3 ）并削弱 OSC 中的能量无序和陷阱密度。相信这项研究不仅带来了对新兴挥发性固体添加剂的深刻理解，也为进一步减少能量损失、提高OSCs的性能带来了新的希望。