Cai Yunhao, Li Qian, Lu Guanyu, Ryu Hwa Sook, Li Yun, Jin Hui, Chen Zhihao, Tang Zheng, Lu Guanghao, Hao Xiaotao, Woo Han Young, Zhang Chunfeng, Sun Yanming
School of Chemistry, Beihang University, 100191, Beijing, P. R. China.
National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Nat Commun. 2022 May 2;13(1):2369. doi: 10.1038/s41467-022-29803-6.
The development of organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, an efficiency of 17.31% (certified value of 16.9%) is obtained for the 300 nm-thick OSC, with a short-circuit current density of 28.36 mA cm, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows an efficiency of 15.21%. This work provides valuable insights into the fabrication of OSCs with thick active layers.
开发具有厚有源层的有机太阳能电池（OSC）对于大面积太阳能电池板的卷对卷印刷至关重要。不幸的是，增加有源层厚度通常会导致效率显著降低。在此，我们制备了具有由一种聚合物供体和两种非富勒烯受体组成的有源层的高效厚膜OSC。发现这两种受体在混合相中具有增大的激子扩散长度，这有利于激子的产生和离解。此外，采用逐层方法优化垂直相分离。受益于增大的激子扩散长度和分级垂直相分离的协同效应，对于300nm厚的OSC，获得了17.31%（认证值为16.9%）的效率，短路电流密度为28.36mA/cm²，填充因子高达73.0%。此外，有源层厚度为500nm的器件也显示出15.21%的效率。这项工作为制备具有厚有源层的OSC提供了有价值的见解。
