Feng Erming, Zhang Chujun, Chang Jianhui, Zhao Feixiang, Hu Bin, Han Yunfei, Sha Mengzhen, Li Hengyue, Du Xiao-Jing, Long Caoyu, Ding Yang, Yang Zhong-Jian, Yin Hang, Luo Qun, Ma Chang-Qi, Lu Guanghao, Ma Zaifei, Hao Xiao-Tao, Yang Junliang
Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha 410083, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
ACS Nano. 2024 Oct 15;18(41):28026-28037. doi: 10.1021/acsnano.4c06931. Epub 2024 Sep 30.
Translating high-performance organic solar cell (OSC) materials from spin-coating to scalable processing is imperative for advancing organic photovoltaics. For bridging the gap between laboratory research and industrialization, it is essential to understand the structural formation dynamics within the photoactive layer during printing processes. In this study, two typical printing-compatible solvents in the doctor-blading process are employed to explore the intricate mechanisms governing the thin-film formation in the state-of-the-art photovoltaic system PM6:L8-BO. Our findings highlight the synergistic influence of both the donor polymer PM6 and the solvent with a high boiling point on the structural dynamics of L8-BO within the photoactive layer, significantly influencing its morphological properties. The optimized processing strategy effectively suppresses the excessive aggregation of L8-BO during the slow drying process in doctor-blading, enhancing thin-film crystallization with preferential molecular orientation. These improvements facilitate more efficient charge transport, suppress thin-film defects and charge recombination, and finally enhance the upscaling potential. Consequently, the optimized PM6:L8-BO OSCs demonstrate power conversion efficiencies of 18.42% in small-area devices (0.064 cm) and 16.02% in modules (11.70 cm), respectively. Overall, this research provides valuable insights into the interplay among thin-film formation kinetics, structure dynamics, and device performance in scalable processing.
将高性能有机太阳能电池（OSC）材料从旋涂工艺转换为可扩展工艺对于推进有机光伏技术至关重要。为了弥合实验室研究与工业化之间的差距，了解印刷过程中光活性层内的结构形成动力学至关重要。在本研究中，采用刮涂工艺中两种典型的与印刷兼容的溶剂，以探究在最先进的光伏系统PM6:L8-BO中控制薄膜形成的复杂机制。我们的研究结果突出了供体聚合物PM6和高沸点溶剂对光活性层内L8-BO结构动力学的协同影响，显著影响其形态学性质。优化的加工策略有效地抑制了刮涂过程中缓慢干燥阶段L8-BO的过度聚集，增强了具有优先分子取向的薄膜结晶。这些改进促进了更有效的电荷传输，抑制了薄膜缺陷和电荷复合，最终增强了放大生产的潜力。因此，优化后的PM6:L8-BO有机太阳能电池在小面积器件（0.064平方厘米）中的功率转换效率为18.42%，在模块（11.70平方厘米）中的功率转换效率为16.02%。总体而言，本研究为可扩展加工中薄膜形成动力学、结构动力学和器件性能之间的相互作用提供了有价值的见解。
