Issue 9, 2023

Asymmetric nonfullerene acceptors with isomeric trifluorobenzene-substitution for high-performance organic solar cells

Abstract

Asymmetric nonfullerene acceptors (NFAs) are an attractive candidate for high-performance organic solar cells (OSCs), whereas effective asymmetric strategies are highly needed to further advance their device performance. Herein, by alternating the substituted position of trifluorobenzene (Ar3F) in the terminal end group, two asymmetric NFA isomers, namely BTP-γ-Ar3F and BTP-β-Ar3F, are designed, and their photophysical and photovoltaic properties are fully compared. With the γ-substituted fashion, it is shown that BTP-γ-Ar3F features a better planarity, contributing to stronger crystallization and favorable phase separation with the PM6 donor polymer. As a result, a higher power conversion efficiency of 17.42% along with a high open circuit voltage of 0.90 V is realized in the PM6:BTP-γ-Ar3F-based OSCs. The established structure–property relationship provides a rational design principle for asymmetric NFAs toward high photovoltaic performance.

Graphical abstract: Asymmetric nonfullerene acceptors with isomeric trifluorobenzene-substitution for high-performance organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
19 12 2022
Accepted
17 1 2023
First published
18 1 2023

J. Mater. Chem. A, 2023,11, 4539-4546

Asymmetric nonfullerene acceptors with isomeric trifluorobenzene-substitution for high-performance organic solar cells

Z. Li, Z. Xu, S. Chen, J. Yao, H. Fu, M. Zhang, Y. Bai, H. Wang, Z. Liu and Z. Zhang, J. Mater. Chem. A, 2023, 11, 4539 DOI: 10.1039/D2TA09858J

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