Heptafluoropentane Side Chain-Engineered Acceptor, a Morphological Modulator for High-Performance Ternary Organic Solar Cells

Shengwei Shen; Bojun Yu; Shizhao Liu; Lingya Sun; Huajun Xu; Tengxiang Gao; Chuangcheng Hong; Xunchang Wang; Jianan Zheng; Yuanyuan Kan; Wei Zhang; Guangye Zhang; Hao Cheng; Renqiang Yang; Weihua Peng; Yanna Sun; Ke Gao

doi:10.1002/cjoc.70390

Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (4) :546 -552. DOI: 10.1002/cjoc.70390

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Heptafluoropentane Side Chain-Engineered Acceptor, a Morphological Modulator for High-Performance Ternary Organic Solar Cells

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¹. Shenzhen Research Institute of Shandong University, A301 Virtual University Park in South District of Shenzhen, Shenzhen, Guangdong, 518057 China

². Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion, Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao, Shandong, 266237 China

³. School of Materials Science and Engineering, Shandong University, Jinan, Shandong, 250061 China

⁴. School of Physics and Materials Science, Guangzhou University, Guangzhou, Guangdong, 510006 China

⁵. Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials & Technology, Jianghan University, Wuhan, Hubei, 430056 China

⁶. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, Guangdong, 518118 China

⁷. Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi, 545006 China

⁸. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong, 510641 China

⁹. Suzhou Research Institute, Shandong University, Suzhou, Jiangsu, 215123 China

¹⁰. Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes, Suzhou University, Suzhou, Jiangsu, 234000 China

hjxu@sdu.edu.cn

yykan@sdu.edu.cn

iamchenghao@126.com

whpeng@ahszu.edu.cn

ynsun@sdu.edu.cn

kegao@sdu.edu.cn

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Abstract

Organic solar cells (OSCs) leveraging non-fullerene acceptors (NFAs) have achieved power conversion efficiencies (PCEs) exceeding 20%, yet their performance critically depends on the nanoscale morphology of the bulk heterojunction (BHJ). Ternary blending is a promising strategy for enhancing photovoltaic parameters and morphology control, but simultaneously optimizing phase separation size, vertical phase distribution, and crystallinity remains challenging. Herein, a new L8-BO-derived non-fullerene acceptor, namely BTP- HFCP, featuring a heptafluorocyclopentenyloxy–octyl side chain was developed. When it was integrated as a third component into the D18:L8-BO binary system, BTP-HFCP acts as an effective morphological modulator. Adv. characterizations reveal that the ternary device exhibits a significantly enhanced vertical phase distribution, optimal phase separation and balanced crystallinity, thereby improving chargecollection and reducing recombination. Consequently, the ternary OSC achieves a champion PCE of 19.32%, surpassing the binary OSC. This work demonstrates that heptafluoropentane side-chain engineering of the third component provides a rational molecular design strategy for precise morphology control in high efficiency ternary OSCs.

Keywords

Organic solar cell / Power conversion Efficiency / Non-fullerene acceptor / Ternary / Morphology

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Shengwei Shen, Bojun Yu, Shizhao Liu, Lingya Sun, Huajun Xu, Tengxiang Gao, Chuangcheng Hong, Xunchang Wang, Jianan Zheng, Yuanyuan Kan, Wei Zhang, Guangye Zhang, Hao Cheng, Renqiang Yang, Weihua Peng, Yanna Sun, Ke Gao. Heptafluoropentane Side Chain-Engineered Acceptor, a Morphological Modulator for High-Performance Ternary Organic Solar Cells. Chinese Journal of Chemistry, 2026, 44(4): 546-552 DOI:10.1002/cjoc.70390