Sun Wen-Jing, Wang Ya-Ting, Zhang Yamin, Sun Bing, Zhang Ze-Qi, Xiao Ming-Jun, Li Xiang-Yang, Huo Yong, Xin Jingming, Zhu Qinglian, Ma Wei, Zhang Hao-Li
State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Angew Chem Int Ed Engl. 2022 Sep 19;61(38):e202208383. doi: 10.1002/anie.202208383. Epub 2022 Aug 8.
Efficient cathode interfacial layers (CILs) are becoming essential elements for organic solar cells (OSCs). However, the absorption of commonly used cathode interfacial materials (CIMs) is either too weak or overlaps too much with that of photoactive materials, hindering their contribution to the light absorption. In this work, we demonstrate the construction of highly efficient CIMs based on 2,7-di-tert-butyl-4,5,9,10-pyrene diimide (t-PyDI) framework. By introducing amino, amino N-oxide and quaternary ammonium bromide as functional groups, three novel self-doped CIMs named t-PyDIN, t-PyDINO and t-PyDINBr are synthesized. These CIMs are capable of boosting the device performances by broadening the absorption, forming ohmic contact at the interface of active layer and electrode, as well as facilitating electron collection. Notably, the device based on t-PyDIN achieved a power conversion efficiency of 18.25 %, which is among the top efficiencies reported to date in binary OSCs.
高效的阴极界面层（CILs）正成为有机太阳能电池（OSCs）的关键要素。然而，常用的阴极界面材料（CIMs）的吸收要么太弱，要么与光活性材料的吸收重叠过多，阻碍了它们对光吸收的贡献。在这项工作中，我们展示了基于2,7-二叔丁基-4,5,9,10-芘二酰亚胺（t-PyDI）框架构建高效的CIMs。通过引入氨基、氨基N-氧化物和溴化季铵作为官能团，合成了三种新型的自掺杂CIMs，分别命名为t-PyDIN、t-PyDINO和t-PyDINBr。这些CIMs能够通过拓宽吸收、在活性层和电极界面形成欧姆接触以及促进电子收集来提高器件性能。值得注意的是，基于t-PyDIN的器件实现了18.25%的功率转换效率，这是迄今为止二元OSCs中报道的最高效率之一。
