CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2023 Mar;35(10):e2209030. doi: 10.1002/adma.202209030. Epub 2023 Jan 22.
Slot-die coating is recognized as the most compatible method for the roll-to-roll (R2R) processing of large-area flexible organic solar cells (OSCs). However, the photovoltaic performance of large-area flexible OSC lags significantly behind that of traditional spin-coating devices. In this work, two acceptors, Qx-1 and Qx-2, show quite different film-formation kinetics in the slot-die coating process. In situ absorption spectroscopy indicates that the excessive crystallinity of Qx-2 provides early phase separation and early aggregation, resulting in oversized crystal domains. Consequently, the PM6:Qx-1-based 1 cm flexible device exhibits an excellent power conversion efficiency (PCE) of 13.70%, which is the best performance among the slot-die-coated flexible devices; in contrast, the PM6:Qx-2 blend shows a pretty poor efficiency, which is lower than 1%. Moreover, the 30 cm modules based on PM6:Qx-1, containing six 5 cm sub-cells, exhibit a PCE of 12.20%. After being stored in a glove box for over 6000 h, the PCE remains at 103% of its initial values, indicating excellent shelf stability. Therefore, these results show a promising future strategy for the upscaling fabrication of flexible large-area OSCs.
狭缝涂布被认为是最适合卷对卷（R2R）处理大面积柔性有机太阳能电池（OSC）的方法。然而，大面积柔性 OSC 的光伏性能明显落后于传统的旋涂器件。在这项工作中，两种受体 Qx-1 和 Qx-2 在狭缝涂布过程中表现出相当不同的成膜动力学。原位吸收光谱表明，Qx-2 的过度结晶提供了早期的相分离和早期的聚集，导致过大的晶体畴。因此，基于 PM6:Qx-1 的 1cm 柔性器件表现出优异的功率转换效率（PCE）为 13.70%，这是狭缝涂布柔性器件中的最佳性能；相比之下，PM6:Qx-2 共混物的效率相当差，低于 1%。此外，基于 PM6:Qx-1 的 30cm 模块，包含六个 5cm 子电池，表现出 12.20%的 PCE。在手套箱中储存超过 6000 小时后，PCE 保持在初始值的 103%，表明其具有出色的货架稳定性。因此，这些结果为柔性大面积 OSC 的大规模制造提供了一种有前途的策略。
