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A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency

光电转换率超过 12%的含氯非富勒烯受体基有机光伏器件

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Abstract

The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor materials. Referring to chlorination, however, it gets less attention and remains ambiguous effect on organic photovoltaic (OPV) cells. Herein, a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups. Y19 exhibits a wide film absorption band from 600 nm to 948 nm and low LUMO (the lowest unoccupied molecular orbital) energy level of −3.95 eV Photovoltaic devices based on PM6:Y19 show high-power conversion efficiency (PCE) of 12.76 % with high open-circuit voltage (Voc) of 0.84 V, short-circuit current density (Jsc) of 22.38 mA/cm2 and fill factor (FF) of 68.18 %. Broad external quantum efficiency (EQE) response of over 60 % in the range of 480–860 nm can be obtained. This study demonstrates that chlorination, as a low-cost molecular design strategy, has its own superiorities to improve device performance and promote the potential application in OPV.

摘要

末端基团的氟化能显著改善有机受体材料的光电性能并已实现了广泛的应用. 相比之下, 氯化策略被关注得较少且对有机光伏电池的影响仍不明确. 这里, 我们报道了一个以苯并三唑为缺电子核及 2Cl-IC 为末端基团的新型非富勒烯受体 Y19. Y19 表现了优异的光学及电化学性质. Y19 的薄膜吸收边带为 948 nm, LUMO 能级水平为−3.95 eV. 基于 PM6:Y19 的光伏器件实现了 12.76 %的能量转换效率, 其开路电压为 0.84 V, 短路电流密度为 22.38 mA/cm2, 填充因子为 0.68. 优化后的活性层有理想的形貌并且电子迁移率达到 6.52×10−4 cm2/(V·s). EQE 测试表明外部量子效率在 480∼860 nm 的范围内超过了 60%. 这一研究表明氯化作为一种低成本的分子设计策略在一定程度上也能改善光伏性能.

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  1. CAO Rui, CHEN Yu contributed equally to this work.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Rui Cao  (曹睿), Yu Chen  (陈瑜), Fang-fang Cai  (蔡方方), Hong-gang Chen  (陈泓钢), Wei Liu  (刘玮), Hui-lan Guan  (管慧兰), Qing-ya Wei  (魏擎亚), Jing Li  (李静), Qin Chang  (常秦), Zhe Li  (李哲) & Ying-ping Zou  (邹应萍)

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  1. Rui Cao  (曹睿)
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  2. Yu Chen  (陈瑜)
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  3. Fang-fang Cai  (蔡方方)
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Contributions

The overarching research goals were developed by CAO Rui, CHEN Yu and ZOU Ying-ping. CAO Rui, CHEN Yu and CAI Fang-fang performed the experiments. CHEN Hong-gang, LIU Wei and GUAN Hui-lan collected the data. The initial draft of the manuscript was written by CAO Rui. WEI Qing-ya, LI Jing, CHANG Qin and LI Zhe reviewed and edited the manuscript.

Corresponding author

Correspondence to Ying-ping Zou  (邹应萍).

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CAO Rui, CHEN Yu, CAI Fang-fang, CHEN Honggang, LIU Wei, GUAN Hui-lan, WEI Qing-ya, LI Jing, CHANG Qin and LI Zhe declare that they have no conflict of interest.

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Foundation item: Project(21875286) supported by the National Natural Science Foundation of China

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Cao, R., Chen, Y., Cai, Ff. et al. A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency. J. Cent. South Univ. 27, 3581–3593 (2020). https://doi.org/10.1007/s11771-020-4501-0

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