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

• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2020,（10）
• 所属期刊栏目: ARTICLES
• 页码范围: 1461-1468
• 页数: 8页
• 语种: 英文

摘要

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.