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

Zhengkai Li; Zheng'ao Xu; Shanshan Chen; Jia Yao; Hongyuan Fu; Ming Zhang; Yang Bai; Haiqiao Wang; Zitong Liu; Zhi-Guo Zhang

doi:10.1039/D2TA09858J

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

Zhengkai Li,‡^a Zheng'ao Xu,‡^a Shanshan Chen,*^b Jia Yao,^a Hongyuan Fu,^a Ming Zhang,^a Yang Bai,^a Haiqiao Wang,

^c Zitong Liu

^d and Zhi-Guo Zhang

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
E-mail: zgzhangwhu@iccas.ac.cn

^b MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
E-mail: shanshanchen@cqu.edu.cn

^c Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers, Beijing University of Chemical Technology, Beijing 100029, China

^d State Key Laboratory of Applied Organic Chemistry (SKLAOC), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China

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.

This article is part of the themed collections: Journal of Materials Chemistry A HOT Papers, #MyFirstJMCA and Honorary themed collection for Thomas P. Russell

Journal of Materials Chemistry A

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

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