| Affiliation: | 1. College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China
College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao, 266071 P. R. China;2. Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875 P. R. China;3. College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao, 266071 P. R. China;4. Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 P. R. China;5. 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 P. R. China;6. College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China |
| Abstract: | Nowadays, it is still a great challenge to obtain high-performance green-solvent-processed organic solar cells (OSCs). In this study, a ternary blend strategy (one donor and two acceptors, 1D/2A) is developed to solve the difficulty of film morphology modulation during the fabrication of high-performance green-solvent-processed OSCs. A typical high-performance halogenated-solvent processable binary system D18:BTP-eC9-4F is selected as the host, its green-solvents-processed devices show an inferior power conversion efficiency (PCE) of ≈16%. SM16 with two 3D shape persistent end groups is selected as the third component due to its high fluorescence quantum yield, reduced intermolecular interaction, good solubility, and moderate crystallinity. As a result, the ternary devices display bicontinuous interpenetrating networks, reduced energy loss, and suppressed charge carrier recombination losses. Hence, an excellent PCE of 18.20% is achieved for the D18:BTP-eC9-4F:SM16 ternary devices, which is much higher than D18:BTP-eC9-4F-based binary ones and also one of the highest PCEs for the green-solvents-processed OSCs. Besides, this strategy also demonstrates a good universality for other binary systems and becomes an effective pathway for the development of green-solvent processable high-performance OSCs. |
