Yao Jia, Qiu Beibei, Zhang Zhi-Guo, Xue Lingwei, Wang Rui, Zhang Chunfeng, Chen Shanshan, Zhou Qiuju, Sun Chenkai, Yang Changduk, Xiao Min, Meng Lei, Li Yongfang
State Key Laboratory of Organic/Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Nat Commun. 2020 Jun 1;11(1):2726. doi: 10.1038/s41467-020-16509-w.
In organic solar cells (OSCs), cathode interfacial materials are generally designed with highly polar groups to increase the capability of lowering the work function of cathode. However, the strong polar group could result in a high surface energy and poor physical contact at the active layer surface, posing a challenge for interlayer engineering to address the trade-off between device stability and efficiency. Herein, we report a hydrogen-bonding interfacial material, aliphatic amine-functionalized perylene-diimide (PDINN), which simultaneously down-shifts the work function of the air stable cathodes (silver and copper), and maintains good interfacial contact with the active layer. The OSCs based on PDINN engineered silver-cathode demonstrate a high power conversion efficiency of 17.23% (certified value 16.77% by NREL) and high stability. Our results indicate that PDINN is an effective cathode interfacial material and interlayer engineering via suitable intermolecular interactions is a feasible approach to improve device performance of OSCs.
在有机太阳能电池（OSC）中，阴极界面材料通常设计有高极性基团，以提高降低阴极功函数的能力。然而，强极性基团可能导致高表面能以及与活性层表面的物理接触不良，这给层间工程带来了挑战，难以解决器件稳定性和效率之间的权衡问题。在此，我们报道了一种氢键界面材料，脂肪族胺功能化苝二酰亚胺（PDINN），它能同时降低空气稳定阴极（银和铜）的功函数，并与活性层保持良好的界面接触。基于PDINN设计的银阴极的OSC表现出17.23%的高功率转换效率（经美国国家可再生能源实验室认证的值为16.77%）以及高稳定性。我们的结果表明，PDINN是一种有效的阴极界面材料，通过合适的分子间相互作用进行层间工程是提高OSC器件性能的可行方法。
