Small molecule ternary solar cell with two synergistic electron acceptors for enhanced photovoltaic performance |
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| Affiliation: | 1. Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;3. Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, China;6. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;3. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China;2. Yunnan Key Laboratory of Optoelectronic Information Technology, Kunming, 650500, China;3. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials, Ministry of Education, Yunnan Normal University, Kunming, 650500, China |
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| Abstract: | In recent years, tremendous progresses have been achieved for solution processed organic solar cells (OSCs). The strategy of adding a third component to fabricate ternary solar cells has emerged as an effective method to enhance the power conversion efficiency (PCE) of devices. Furthermore, small molecules feature as lower viscosity and excellent repeatability which facilitate the effective morphology control during fabrication process for enhanced photovoltaic performance. Herein, we report a series of ternary solar cells based on a liquid crystal molecule BTR and two electron acceptors of PC71BM and Y6. These molecules show complementary absorption to broaden spectra coverage and form energy levels cascade for efficient charge transfer. Meanwhile, thanks to the improved molecular packing and formed efficient charge transport network in the ternary blend film, the optimal ternary device possesses the improved charge dynamics and suppressed charge recombination. Thus, ternary solar cells deliver the highest PCE of 11.82% with simultaneously enhanced parameters of JSC, VOC and FF. This finding further illustrates the important roles of synergistic effect of fullerenes and non-fullerene acceptors in fabricating highly efficient ternary solar cells. |
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| Keywords: | All small molecules Charge dynamics Fiber-like networks Synergistic effect Ternary solar cells |
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