Xiang Huimin, Sun Fengbo, Zheng Xufan, Gao Bowen, Zhu Panpan, Cong Tingting, Li Yuda, Wang Xunchang, Yang Renqiang
Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials and Technology, Jianghan University, Wuhan, 430056, China.
Key Laboratory for Green Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430205, China.
Adv Sci (Weinh). 2024 Jul;11(25):e2401330. doi: 10.1002/advs.202401330. Epub 2024 Apr 18.
The energy loss induced open-circuit voltage (V) 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 (ΔE/ΔE) 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.
能量损失引起的开路电压（V）亏缺阻碍了先进有机太阳能电池（OSC）的快速发展，因此，探索有效的策略来解决这一问题迫在眉睫。在此，一种具有集中静电势分布特征的新型挥发性固体添加剂1,4-双（碘甲基）环己烷（DIMCH）被用作形态导向客体，以减少多种先进共混体系中的能量损失，从而在已报道的二元OSC中处于前沿地位，实现了最高效率之一（18.8%）。挥发性的DIMCH通过合理平衡给体和受体的结晶度，在成膜过程中实现晶域的均匀网络结构并减少D-A相分离，降低了辐射/非辐射复合引起的能量损失（ΔE/ΔE），并减弱了OSC中的能量无序和陷阱密度。相信这项研究不仅为新兴的挥发性固体添加剂带来了深刻的理解，也为进一步降低能量损失和提高OSC的性能带来了新的希望。
