Novel wide band-gap polymer utilizing fused hetero-aromatic unit for efficient polymer solar cells and field-effect transistors |
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| Affiliation: | 1. Department of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in the Ministry of Education, Xiangtan University, Xiangtan 411105, PR China;2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China;3. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;1. Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University, Kuemjeong-Ku, Busan 690-735, Republic of Korea;2. Department of Chemistry, The Catholic University of Korea, Bucheon 420-743, Republic of Korea;1. Information and Communications Technologies Portfolio, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada;2. Département de Chimie, Université Laval, Québec City, QC G1V 0A6, Canada;1. College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan 411105, China;2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;1. CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy;2. Center for Nanotechnology for Engineering (CNIS), University of Rome La Sapienza, P.le A. Moro 5, 00185 Rome, Italy;3. Department of Basic and Applied Sciences for Engineering, University of Rome La Sapienza, Via Antonio Scarpa 16, 00161 Roma, Italy;1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Novel wide band-gap polymer of PBTFT containing dibenzosexithiophene-alt-bithiophene backbone was designed and synthesized via the Stille cross-coupling reaction. This polymer exhibited good thermal stability, well coplanar backbone and a broad absorption band from 350 nm to 610 nm with a wide optical band-gap of 2.02 eV. The polymer solar cells (PSCs) based on the PBTFT:PC71BM active layer showed the power conversion efficiency of 3.0% with an open circuit voltage of 0.70 V, a short-circuit current of 7.94 mA cm−2 and a fill factor of 53.98% under the illumination of AM.1.5, 100 mW cm−2. Holes mobility up to 0.028 cm2 V−1 s−1 with an on-off ratio of 1.0 × 106 was obtained in the PBTFT-based organic field-effect transistors (OFETs). Our work indicates that the dibenzosexithiophene-alt-bithiophene based copolymer can be efficiently applied in PSCs and OFETs. |
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| Keywords: | Wide band-gap polymers Polymer solar cells Organic field-effect transistors |
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