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Issue 4, 2019
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Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells

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Compared to thiophene-based non-fullerene acceptors (NFAs), selenophene-based NFAs have received much less attention. And organic solar cells (OSCs) based on selenophene-containing NFAs typically exhibit relatively low power conversion efficiency (PCE < 12%) and fill factor (FF < 70%). In this contribution, we have designed and synthesized two asymmetric selenophene-based NFAs, named SePTT-2F and SePTTT-2F, which possess the same end-capping group but different selenophene-containing conjugated backbones. On comparing the two NFAs, SePTTT-2F with more extended conjugation in the backbone was found to have almost the same maximum absorption peak and optical bandgap in film as SePTT-2F but an up-shifted lowest unoccupied molecular orbital (LUMO) energy level and higher electron mobility. By pairing the NFAs with the polymer donor PBT1-C, the resultant blend film based on SePTTT-2F exhibited higher and more balanced charge mobilities and more efficient exciton dissociation and charge collection in comparison with the SePTT-2F-based blend film. As a result, OSCs based on SePTTT-2F delivered an impressively high PCE of 12.24% with an outstanding FF of 75.9%, much higher than those of the SePTT-2F-based OSCs. To the best of our knowledge, the PCE of 12.24% and FF of 75.9% are among the highest values reported in the literature so far for both the parameters amongst selenophene-containing NFA-based OSCs. Our results demonstrate that extending the conjugation in the selenophene-containing backbone is an effective strategy to design highly efficient selenophene-based NFAs.

Graphical abstract: Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells

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Publication details

The article was received on 21 Nov 2018, accepted on 19 Dec 2018 and first published on 20 Dec 2018

Article type: Communication
DOI: 10.1039/C8TA11197A
Citation: J. Mater. Chem. A, 2019,7, 1435-1441

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    Asymmetric selenophene-based non-fullerene acceptors for high-performance organic solar cells

    C. Li, T. Xia, J. Song, H. Fu, H. S. Ryu, K. Weng, L. Ye, H. Y. Woo and Y. Sun, J. Mater. Chem. A, 2019, 7, 1435
    DOI: 10.1039/C8TA11197A

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