High-Performance Green Thick-Film Ternary Organic Solar Cells Enabled by Crystallinity Regulation |
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| Authors: | Heng Zhao Jingwei Xue Hongbo Wu Baojun Lin Yuhang Cai Ke Zhou Daqin Yun Zheng Tang Wei Ma |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi’ an, 710049 China;2. Center for Advanced Low-dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620 China;3. College of Energy, Xiamen University, Xiamen, 361005 China |
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| Abstract: | The power conversion efficiency (PCE) of organic solar cells (OSCs) has reached high values of over 19%. However, most of the high-efficiency OSCs are fabricated by spin-coating with toxic solvents and the optimal photoactive layer thickness is limited to 100 nm, limiting practical development of OSCs. It is a great challenge to obtain ideal morphology for high-efficiency thick-film OSCs when using non-halogenated solvents due to the unfavorable film formation kinetics. Herein, high-efficiency ternary thick-film (300 nm) OSCs with PCE of 15.4% based on PM6:BTR-Cl:CH1007 are fabricated by hot slot-die coating using non-halogenated solvent (o-xylene) in the air. Compared to PM6:BTR-Cl:Y6 blends, the stronger pre-aggregation of CH1007 in solution induces the earlier aggregation of CH1007 molecules and longer aggregation time, and thus results in high and balanced crystallinity of donors and acceptor in CH1007-based ternary film, which led to high-carrier mobility and suppressed charge recombination. The ternary strategy is further used to fabricate high-efficiency, thick-film, large-area, and flexible devices processed from non-halogenated solvents, paving the way for industrial development of OSCs. |
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| Keywords: | non-halogenated solvents slot-die coatings ternary organic solar cells thick photoactive layers |
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