Abstract
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%.
Original language | English |
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Pages (from-to) | 537-543 |
Number of pages | 7 |
Journal | Materials Chemistry Frontiers |
Volume | 2 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2018 |
ASJC Scopus subject areas
- Materials Science(all)
- Materials Chemistry