journal article·2023-09-27

High-Performance Nonfused Electron Acceptor with Precisely Controlled Side Chain Fluorination

Kexin Yu, Tao Zhou, Wenting Liang, Xiaoli Zhou, Xiaopeng Xu, Liyang Yu, Bo Hou, Yangen Huang, Fengkun Chen, Yaozu Liao, Huawei Hu

ACS Applied Materials & Interfaces· Volume 15· Issue 38
Publisher page

Abstract

Modification of the molecular packing of nonfullerene acceptors through fluorination represents one of the most promising strategies to achieve highly efficient organic solar cells (OSCs). In this work, three nonfused electron acceptors, namely, DTCBT-F x ( x = 0, 5, 9) with precisely controlled amounts of fluorine atoms in the side chains are designed and synthesized, and the effect of side chain fluorination is systematically studied. The results demonstrate that the light absorption, energy levels, molecular ordering, and film morphology could be effectively tuned by precisely controlling the side chain fluorination. DTCBT-F5 with an appropriate fluorine functionalization exhibits suitable miscibility with the donor polymer (PM6), leading to diminished charge recombination and improved charge carrier mobility. Consequently, a promising power conversion efficiency of 12.7% was obtained for DTCBT-F5-based solar cells, which outperforms those OSCs based on DTCBT-F0 (11.4%) and DTCBT-F9 (11.6%), respectively. This work demonstrates that precise control of the fluorine functionalization in side chains of nonfused electron acceptors is an effective strategy for realizing highly efficient OSCs.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China

College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China

College of Chemistry and School of Chemical Engineering, Sichuan University, Chengdu 610065, China

School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, U.K.

Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan 030024, China

Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education/National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, China

Funding

Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University · Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering

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