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Electron acceptors with varied linkages between perylene diimide and benzotrithiophene for efficient fullerene-free solar cells

Abstract

In this work, we present two new electron acceptors, TriPDI and Fused-TriPDI, in which three perylene diimide (PDI) moieties are tethered to benzotrithiophene (BTT) core via either single bonds (TriPDI) or ring-fusion (Fused-TriPDI). TriPDI connects three PDIs to BTT via carbon-carbon single bonds, resulting in a rotatable and highly twisted skeleton. Instead, Fused-TriPDI, made through oxidative ring-fusion of TriPDI, exhibits good structural rigidity and planarity, as well as effective conjugation between PDI and BTT. As results, the fused molecule shows up-shifted energy levels, enhanced absorption and charge mobility over the unfused one. The polymer solar cells (PSCs) with PTB7-Th:Fused-TriPDI blend show the best power conversion efficiency of 6.19%, which is around three times higher than that with PTB7-Th:TriPDI.

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Publication details

The article was received on 24 Mar 2017, accepted on 13 Apr 2017 and first published on 14 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA02582C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Electron acceptors with varied linkages between perylene diimide and benzotrithiophene for efficient fullerene-free solar cells

    B. Wang, W. Liu, H. Li, J. Mai, S. Liu, X. Lu, H. Li, M. Shi, C. Li and H. Chen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02582C

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