Issue 10, 2019

A 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 narrow-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 a benzo[1,2-d:4,5-d′]bisthiazole core as an acceptor moiety and benzo[1,2-b:4,5-b′]dithiophene as a 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 their thiazolothiazole-based analogue, BBTA-based devices show a stronger photo-response, more balanced hole/electron mobilities, weaker bimolecular recombination and well donor/acceptor miscibility. This study reveals great potential to construct a high-performance WBG polymer donor using electron-deficient benzo[1,2-d:4,5-d′]bisthiazole.

Graphical abstract: A 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

Supplementary files

Article information

Article type
Communication
Submitted
29 Nov 2018
Accepted
06 Feb 2019
First published
07 Feb 2019

J. Mater. Chem. A, 2019,7, 5234-5238

A 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, 7, 5234 DOI: 10.1039/C8TA11492G

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