Zhang Zijian, Miao Junhui, Ding Zicheng, Kan Bin, Lin Baojun, Wan Xiangjian, Ma Wei, Chen Yongsheng, Long Xiaojing, Dou Chuandong, Zhang Jidong, Liu Jun, Wang Lixiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, P. R. China.
University of Chinese Academy of Sciences, No.19A Yuquan Road, 100049, Beijing, P. R. China.
Nat Commun. 2019 Jul 22;10(1):3271. doi: 10.1038/s41467-019-10984-6.
Efficient organic solar cells (OSCs) often use combination of polymer donor and small molecule acceptor. Herein we demonstrate efficient and thermally stable OSCs with combination of small molecule donor and polymer acceptor, which is expected to expand the research field of OSCs. Typical small molecule donors show strong intermolecular interactions and high crystallinity, and consequently do not match polymer acceptors because of large-size phase separation. We develop a small molecule donor with suppressed π-π stacking between molecular backbones by introducing large steric hindrance. As the result, the OSC exhibits small-size phase separation in the active layer and shows a power conversion efficiency of 8.0%. Moreover, this OSC exhibits much improved thermal stability, i.e. maintaining 89% of its initial efficiency after thermal annealing the active layer at 180 °C for 7 days. These results indicate a different kind of efficient and stable OSCs.
高效有机太阳能电池（OSC）通常采用聚合物给体和小分子受体的组合。在此，我们展示了一种由小分子给体和聚合物受体组合而成的高效且热稳定的有机太阳能电池，这有望拓展有机太阳能电池的研究领域。典型的小分子给体表现出强烈的分子间相互作用和高结晶度，因此由于尺寸较大的相分离而与聚合物受体不相匹配。我们通过引入大的空间位阻，开发了一种分子主链间π-π堆积受到抑制的小分子给体。结果，该有机太阳能电池在活性层中表现出小尺寸的相分离，并显示出8.0%的功率转换效率。此外，这种有机太阳能电池表现出显著提高的热稳定性，即在180°C对活性层进行7天的热退火后仍保持其初始效率的89%。这些结果表明了一种不同类型的高效且稳定的有机太阳能电池。
