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High-Performance All-Polymer Solar Cells: Synthesis of Polymer Acceptor by a Random Ternary Copolymerization Strategy |
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| Authors: | Jiaqi Du Ke Hu Prof Lei Meng Dr Indunil Angunawela Dr Jinyuan Zhang Shucheng Qin Dr Alex Liebman-Pelaez Dr Chenhui Zhu Prof Zhanjun Zhang Prof Harald Ade Prof Yongfang Li |
| Institution: | 1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190 China
School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049 China These authors contributed equally to this work.;2. School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049 China These authors contributed equally to this work.;3. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190 China;4. Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University, Raleigh, NC, 27695 USA;5. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190 China School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049 China;6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA;7. School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049 China |
| Abstract: | Demonstrated in this work is a simple random ternary copolymerization strategy to synthesize a series of polymer acceptors, PTPBT-ETx, by polymerizing a small-molecule acceptor unit modified from Y6 with a thiophene connecting unit and a controlled amount of an 3-ethylesterthiophene (ET) unit. Compared to PTPBT of only Y6-like units and thiophene units, PTPBT-ETx (where x represents the molar ratio of the ET unit) with an incorporated ET unit in the ternary copolymers show up-shifted LUMO energy levels, increased electron mobilities, and improved blend morphologies in the blend film with the polymer donor PBDB-T. And the all-polymer solar cell (all-PSC) based on PBDB-T:PTPBT-ET0.3 achieved a high power conversion efficiency over 12.5 %. In addition, the PTPBT-ET0.3-based all-PSC also exhibits long-term photostability over 300 hours. |
| Keywords: | copolymerization mechanical properties polymers solar cells synthetic methods |