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Issue 45, 2017
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Non-fullerene acceptors based on fused-ring oligomers for efficient polymer solar cells via complementary light-absorption

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Abstract

We designed and synthesized two novel non-fullerene small molecule acceptors (IDT-N and IDT-T-N) that consist of indacenodithiophene (IDT) as the electron-donating core and 2-(3-oxo-2,3-dihydro-1H-cyclopenta[b]naphthalen-1-ylidene)malononitrile (N) as a novel electron-withdrawing end group. IDT-N and IDT-T-N consisting of the naphthyl-based N group exhibited an expanded plane compared to phenyl-based indanone (INCN), which strengthened the intramolecular push–pull effect between the core donor unit and the terminal acceptor units. This strengthened effect resulted in a reduced bandgap that was beneficial for solar photon collection and increased short-circuit current density of the resulting devices. IDT-N and IDT-T-N exhibited red-shifted absorptions and smaller optical bandgaps than the corresponding phenyl-fused indanone end-capped chromophores. Both acceptors exhibited broad absorptions and energy levels that were well-matched with the donor materials. Polymer solar cells based on IDT-N and IDT-T-N and two representative polymer donors (PTB7-Th and PBDB-T) exhibited impressive photovoltaic performances. The devices based on the PBDB-T:IDT-N system exhibited a power conversion efficiency of up to 9.0%, with a short-circuit current density of 15.88 mA cm−2 and a fill factor of 71.91%. These results demonstrate that IDT-N and IDT-T-N are promising electron acceptors for use in polymer solar cells.

Graphical abstract: Non-fullerene acceptors based on fused-ring oligomers for efficient polymer solar cells via complementary light-absorption

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Publication details

The article was received on 28 Jul 2017, accepted on 25 Oct 2017 and first published on 26 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06631G
Citation: J. Mater. Chem. A, 2017,5, 23926-23936
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    Non-fullerene acceptors based on fused-ring oligomers for efficient polymer solar cells via complementary light-absorption

    R. Li, G. Liu, M. Xiao, X. Yang, X. Liu, Z. Wang, L. Ying, F. Huang and Y. Cao, J. Mater. Chem. A, 2017, 5, 23926
    DOI: 10.1039/C7TA06631G

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