Journal
SCIENCE CHINA-CHEMISTRY
Volume 63, Issue 12, Pages 1799-1806Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-020-9820-2
Keywords
organic solar cells; non-fullerene acceptor; side chains
Categories
Funding
- Ministry of Science and Technology of China [2019YFA0705900]
- National Natural Science Foundation of China [51773095, 21935007, 51873089]
- Natural Science Foundation of Tianjin City [17JCJQJC44500]
- Program of Introducing Talents of Discipline to Universities of China (111 Project) [B12015]
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Side chain engineering plays a substantial role for high-performance organic solar cells (OSCs). Herein, a series of non-fullerene acceptor (NFA) molecules with A-D-A structures, TTCn-4F, with gradient substituent lengths of terminal side chains (T-SCs) on the molecular backbones have been designed and synthesized. The effects of T-SCs length, ranging from hydrogen atom to n-dodecyl, their optoelectronic properties, thin film molecular packing, blend film morphology, and overall photovoltaic performance have been systematically studied. The results show that among this series of molecules, TTC8-4F with n-octyl substituent, showed the best photovoltaic performance when applied with PM6 as the donor due to its favorable morphology, balanced charge mobility, effective exciton dissociation and less charge recombination. Based on this, its ternary device with F-Br as the secondary acceptor achieved a high PCE of 15.34% with the simultaneously enhancedV(oc)of 0.938 V,J(sc)of 22.66 mA cm(-2), and FF of 72.15%. These results indicate that the engineering of T-SCs is an effective strategy for designing high-performance NFAs.
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