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High-performance non-fused electron acceptor with precisely controlled side chain fluorination

Yu, Kexin, Zhou, Tao, Liang, Wenting, Zhou, Xiaoli, Xu, Xiaopeng, Yu, Liyang, Hou, Bo ORCID:, Huang, Yangen, Chen, Fengkun, Liao, Yaozu and Hu, Huawei 2023. High-performance non-fused electron acceptor with precisely controlled side chain fluorination. ACS Applied Materials and Interfaces 15 (38) , pp. 45158-45166. 10.1021/acsami.3c09076
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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-Fx (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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Chemical Society
ISSN: 1944-8244
Date of First Compliant Deposit: 17 September 2023
Date of Acceptance: 4 September 2023
Last Modified: 23 Nov 2023 08:24

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