Journal
CHEMISTRY OF MATERIALS
Volume 30, Issue 15, Pages 5429-5434Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b02276
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Funding
- Asian Office of Aerospace RD [FA2386-15-1-4106]
- Office of Naval Research [N00014-17-1-2201]
- National Natural Science Foundation of China [51473142, 21734008]
- National Science Fund for Distinguished Young Scholars [51425304]
- State-Sponsored Scholarship for Graduate Students from the China Scholarship Council
- Thousand Youth Talents Plan of China
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
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Two novel non-fullerene acceptors, SN6IC and SN6IC-4F, based on an S,N-heteroacene backbone were designed and synthesized. The cyclopentadiene fragments of commonly used acceptors were replaced with pyrrole rings to improve the electron-donating ability to increase the energy levels of the molecules. Both acceptors match well with the absorption and energy levels of the polymer donor PBDB-T, and PBDB-T:SN6IC-4F-based solar cells showed an excellent power conversion efficiency of 13.2%, with a relatively small V-OC loss of 0.54 eV. This study proves that the introduction of a nitrogen atom to replace the sp(3)-hybridized carbon in the fused ring is very effective for making highly efficient NFAs to further improve the performance of organic solar cells.
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