Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 2, Issue 3, Pages 537-543Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7qm00547d
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Funding
- NSFC [21734001, 51761165023, 21504066, 21534003]
- NSF [DMR-1507249, CBET-1639429]
- Ministry of Science and Technology of China [2016YFA0200700]
- Office of Science, Office of Basic Energy Sciences, of the U. S. Department of Energy [DE-AC02-05CH11231]
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We choose the high-performance nonfullerene acceptor ITIC-Th as an example, and incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal group 1,1-dicyanomethylene-3-indanone (IC) to construct a small library of four fused-ring electron acceptors. With this series, we systematically investigate the effects of the substituents on the end-groups on the electronic properties, charge transport, film morphology, and photovoltaic properties of the ITIC-Th series. The electron-withdrawing ability increases from methoxylated to unsubstituted, fluorinated, and difluorinated IC, leading to a downshift of energy levels and a redshift of absorption spectra. Optimized organic solar cells based on the ITIC-Th series show power conversion efficiencies ranging from 8.88% to 12.1%.
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