Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6％ efficiency

• 作 者: Donghui Li Xiaolong Chen Jinglong Cai Wei Li Mengxue Chen Yuchao Mao Baocai Du Joel A.Smith Rachel C.Kilbride Mary E.O’Kane Xue Zhang Yuan Zhuang Pang Wang Hui Wang Dan Liu Richard A.L.Jones David G.L
• 机 构: School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;Sta
• 出 处: 中国科学:化学（英文版）
• 发表日期: 2020年10期
• 关键词: ternary solar cells non-fullerene acceptor fibrils power conversion efficiency

Optimizing the components and morphology within the photoactive layer of organic solar cells (OSCs) can significantly enhance their power conversion efficiency (PCE).A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work,and is employed as the third component to prepare high performance ternary solar cells.IDMIC-4F can form fibrils after solution casting,and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains,as well as acting as transport channels to enhance electron mobility.Single junction ternary devices incorporating 10 wt％ IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility,and achieve a maximum PCE of 16.6％ compared to 15.7％ for the binary device,which is a remarkable efficiency for OSCs reported in literature.This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.