Central Unit Fluorination of Non‐Fullerene Acceptors Enables Highly Efficient Organic Solar Cells with Over 18 % Efficiency

Halogenation of terminal of acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs). Similar significant results could be expected from the halogenation of the central units of state‐of‐the‐art Y‐series acceptors. Herein, a pair of...

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Published in:Angewandte Chemie International Edition 2022-10, Vol.61 (41), p.e202209580-n/a
Main Authors: Chen, Hongbin, Liang, Huazhe, Guo, Ziqi, Zhu, Yu, Zhang, Zhe, Li, Zhixiang, Cao, Xiangjian, Wang, Haohui, Feng, Wanying, Zou, Yalu, Meng, Lingxian, Xu, Xiaoyun, Kan, Bin, Li, Chenxi, Yao, Zhaoyang, Wan, Xiangjian, Ma, Zaifei, Chen, Yongsheng
Format: Article
Language:English
Subjects:
Central Unit
Conjugation
Energy conversion efficiency
Fluorination
Fullerenes
Halogenation
Methane
Molecular interactions
Non-Fullerene Acceptor
Optimization
Photovoltaic cells
Solar Cells
Y-series
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Summary:Halogenation of terminal of acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs). Similar significant results could be expected from the halogenation of the central units of state‐of‐the‐art Y‐series acceptors. Herein, a pair of acceptors, termed CH6 and CH4, featuring a conjugation‐extended phenazine central unit with and without fluorination, have been synthesized. The fluorinated CH6 has enhanced molecular interactions and crystallinity, superior fibrillar network morphology and improved charge generation and transport in blend films, thus affording a higher PCE of 18.33 % for CH6‐based binary OSCs compared to 16.49 % for the non‐fluorinated CH4. The new central site offers further opportunities for structural optimization of Y‐series molecules to afford better‐performed OSCs and reveals the effectiveness of fluorination on central units. A series of CH molecules with a new modification site on the central unit of Y‐series electron acceptors has been designed and synthesized to afford better‐performing organic solar cells (OSCs). Further fluorination on the largely unexplored central unit enabled significantly improved photovoltaic performance with over 18% efficiency for CH6‐based binary OSCs.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202209580