Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency
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tps://doi.org/10.1007/s11426-019-9681-8
2019 Emerging Investigator Issue
Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency 1,2
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Donghui Li , Xiaolong Chen , Jinglong Cai , Wei Li , Mengxue Chen , Yuchao Mao , 1,2 3 3 3 1,2 Baocai Du , Joel A. Smith , Rachel C. Kilbride , Mary E. O’Kane , Xue Zhang , 1,2 1,2 1,2 1,2 3 Yuan Zhuang , Pang Wang , Hui Wang , Dan Liu , Richard A. L. Jones , 3 1,2* David G. Lidzey & Tao Wang 1
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School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China; 3 Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK Received December 19, 2019; accepted January 8, 2020; published online February 12, 2020
Optimizing the components and morphology within the photoactive layer of organic solar cells (OSCs) can significantly enhance their power conversion efficiency (PCE). A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work, and is employed as the third component to prepare high performance ternary solar cells. IDMIC-4F can form fibrils after solution casting, and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains, as well as acting as transport channels to enhance electron mobility. Single junction ternary devices incorporating 10 wt% IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility, and achieve a maximum PCE of 16.6% compared to 15.7% for the binary device, which is a remarkable efficiency for OSCs reported in literature. This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs. ternary solar cells, non-fullerene acceptor fibrils, power conversion efficiency Citation:
Li D, Chen X, Cai J, Li W, Chen M, Mao Y, Du B, Smith JA, Kilbride RC, O’Kane ME, Zhang X, Zhuang Y, Wang P, Wang H, Liu D, Jones RAL, Lidzey DG, Wang T. Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-019-9681-8
1 Introduction Organic solar cells (OSCs) have huge potential as renewable energy generators due to their flexible and light-weight nature, as well as the possibility for large-area fabrication by solution processing the photoactive layer [1–3]. The maximum achievable power conversion efficiency (PCE) of OSCs continues to improve as a result of extensive efforts on the synthesis of new semiconducting materials [4–6], morphological control [7], interfacial engineering [8–10] and *Corresponding author (email: [email protected])
innovations in device architecture [11,12], with PCEs over 16% being reported for single-junction binary OSCs [13– 18]. Whilst the development of novel electron donors or nonfullerene acceptors is the key to further enhance the ef
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