A Fully Non-fused Ring Acceptor with Planar Backbone and Near-IR Absorption for High Performance Polymer Solar Cells |
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| Authors: | Dr Ya-Nan Chen Dr Miao Li Yunzhi Wang Jing Wang Dr Ming Zhang Dr Yuanyuan Zhou Dr Jianming Yang Dr Yahui Liu Prof Feng Liu Prof Zheng Tang Prof Qinye Bao Prof Zhishan Bo |
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| Institution: | 1. College of Textiles & Clothing, Qingdao University, Qingdao, 266071 China;2. Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China;3. 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;4. Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China;5. Key Laboratory of Polar Materials and Devices, Department of Optoelectronics, East China Normal University, Shanghai, 200241 China |
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| Abstract: | Fused-ring electron acceptors have made significant progress in recent years, while the development of fully non-fused ring acceptors has been unsatisfactory. Here, two fully non-fused ring acceptors, o-4TBC-2F and m-4TBC-2F, were designed and synthesized. By regulating the location of the hexyloxy chains, o-4TBC-2F formed planar backbones, while m-4TBC-2F displayed a twisted backbone. Additionally, the o-4TBC-2F film showed a markedly red-shifted absorption after thermal annealing, which indicated the formation of J-aggregates. For fabrication of organic solar cells (OSCs), PBDB-T was used as a donor and blended with the two acceptors. The o-4TBC-2F-based blend films displayed higher charge mobilities, lower energy loss and a higher power conversion efficiency (PCE). The optimized devices based on o-4TBC-2F gave a PCE of 10.26 %, which was much higher than those based on m-4TBC-2F at 2.63 %, and it is one of the highest reported PCE values for fully non-fused ring electron acceptors. |
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| Keywords: | electron acceptors fully nonfused acceptors J-aggregation organic solar cells |
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