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Benzo[1,2-d:4,5-d’]bisthiazole-based wide-bandgap copolymer semiconductor for efficient fullerene-free organic solar cells with a small energy loss of 0.50 eV

Abstract

With the development of low-bandgap small-molecule acceptors, design of wide-bandgap donors, which have complementary absorption with acceptors, becomes increasingly important. Herein, a wide-bandgap D-A-type conjugated copolymer donor, BBTA, with benzo[1,2-d:4,5-d’]bisthiazole core as acceptor moiety and benzo[1,2-b:4,5-b’]dithiophene as donor moiety is designed and synthesized. Bulk-heterojunction non-fullerene OSCs based on BBTA are fabricated, achieving a PCE of 11.08% with a Voc of 1.00 V, a Jsc of 17.63 mA cm–2, a FF of 63.1% and a very low energy loss of 0.50 eV. Compared with its thiazolothiazole-based analogue, BBTA-based devices show stronger photo-response, more balanced hole/electron mobilities, weaker bimolecular recombination and well donor/acceptor miscibility. This study reveals great potential to construct high-performance WBG polymer donor using an electron-deficient benzo[1,2-d:4,5-d’]bisthiazole.

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Publication details

The article was received on 29 Nov 2018, accepted on 06 Feb 2019 and first published on 07 Feb 2019


Article type: Communication
DOI: 10.1039/C8TA11492G
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Benzo[1,2-d:4,5-d’]bisthiazole-based wide-bandgap copolymer semiconductor for efficient fullerene-free organic solar cells with a small energy loss of 0.50 eV

    N. Chen, Q. Yue, W. Liu, H. Zhang and X. Zhu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11492G

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