期刊
SCIENCE CHINA-CHEMISTRY
卷 63, 期 10, 页码 1461-1468出版社
SCIENCE PRESS
DOI: 10.1007/s11426-019-9681-8
关键词
ternary solar cells; non-fullerene acceptor fibrils; power conversion efficiency
资金
- Natural Science Foundation of Hubei Province of China [2018CFA055]
- National Natural Science Foundation of China [21774097]
- 111 project [B18038]
- U.K. EPSRC [EP/L016281/1, EP/L01551X/1]
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.
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