An acceptor‐acceptor conjugated copolymer based on perylene diimide for high mobility n‐channel transistor in air |
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| Authors: | Xingang Zhao Yugeng Wen Longbin Ren Lanchao Ma Yunqi Liu Xiaowei Zhan |
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| Institution: | 1. Beijing National Laboratory for Molecular Sciences and Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A new solution‐processable acceptor‐acceptor conjugated copolymer ( P1 ) based on perylene diimide (PDI) incorporating planar electron‐deficient fluorenone was synthesized by palladium(0)‐catalyzed Suzuki coupling reaction. Relative to the donor‐acceptor conjugated copolymer ( P2 ) of PDI and dithienothiophene, polymer P1 exhibits 0.1 eV down shift of lowest unoccupied molecular orbital (LUMO) level, 70 nm blue shift of low‐energy absorption band, and 0.36 eV increase of optical band gap. Polymer P1 in top‐contact bottom‐gate organic field‐effect transistors exhibits a saturation electron mobility of 0.01 cm2/(V s) in air, while P2 does not function in the same device in air. The better air stability of P1 is attributed to a more dense packing of the polymer chains excluding oxygen or water and lower LUMO level of P1 . © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 |
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| Keywords: | charge transport conjugated polymers field‐effect transistor fluorenone n‐type conjugated polymer perylene diimide synthesis |
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