Ultra‐High Dielectric Acceptor Enables 21% Efficiency and Thickness‐Insensitive Organic Solar Cells
Abstract
ABSTRACT Dielectric constant (ε r ) of non‐fullerene acceptors (NFAs) is a crucial parameter in organic solar cells (OSCs), significantly influencing exciton dissociation efficiency and charge recombination dynamics. However, the state‐of‐the‐art NFAs typically exhibit relatively low dielectric constants (ε r ≈ 3–5), which inherently limit device performance by promoting substantial recombination losses. Herein, a new guest acceptor named L8‐BO‐FO is reported by replacing the branched alkyl chains on L8‐BO with dimethyl ether units, which presents a higher ε r value of 7.41 than that of L8‐BO (4.57). Subsequently, the high‐ε r L8‐BO‐FO was introduced into the PM6:L8‐BO system to improve the dielectric property of the active layer, which, encouragingly, increases the ε r value of the active layer, accelerates exciton dynamics, and suppresses the nonradiative charge recombination. As a result, the power conversion efficiency (PCE) of the ternary OSCs is boosted up to 21.0%. Surprisingly, the ternary OSCs maintained an outstanding PCE of 19.1% even when the active‐layer thickness increased to 300 nm. This work brings new insights into the design of high‐performance OSCs with excellent thickness tolerance by dielectric engineering, which is essential for high‐throughput and scale‐up fabrication of OSCs.
Article Details
Authors (26)
Youdi Zhang
College of Chemistry Key Laboratory of Advanced Green Functional Materials Changchun Normal University Changchun China
Hansheng Chen
School of Materials Shenzhen Campus of Sun Yat‐Sen University Shenzhen Guangdong China
Ailing Yin
School of Integrated Circuits, Shandong University 1 , Jinan 250100,
Hao Wang
Division of Quantitative Sciences, Department of Oncology Johns Hopkins University School of Medicine Baltimore Maryland USA
Nan Ye
Shuai Xu
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences
Pai Peng
State Key Laboratory of Advanced Fiber Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University , Shanghai 201620,
Peng Zhang
Junfei Zhu
Institute of New Energy Materials and Engineering, College of Materials Science and Engineering, State Key Laboratory of Green and Efficient Development of Phosphorus Resources Fuzhou University Fuzhou P.R. China
Boyao Zhang
Division of Infectious Diseases and Immunology, Department of Medicine, Program in Innate Immunity, University of Massachusetts Chan Medical School
Hongxiang Li
College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering
Chen Xie
Guangye Zhang
Xiaotian Hu
Lei Zhu
Long Ye
School of Materials Science and Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Key Laboratory of Organic Integrated Circuits, Ministry of Education, Collaborative innovation Center of Chemical Science and Engineering (Tianjin)
Huiliang Sun
School of Chemistry and Chemical Engineering Gannan Normal University Ganzhou Jiangxi P. R. China
Shenghua Liu
School of Materials
Qingqing Yang
Tonghui Wang
Shouguo Wang
Qing Jiang
Chunhui Duan
Yiwang Chen
College of Chemistry and Chemical Engineering/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC), Nanchang University, Nanchang, China.
Feng Liu
Yongfang Li