Transistor Paint: Environmentally Stable N‐alkyldithienopyrrole and Bithiazole‐Based Copolymer Thin‐Film Transistors Show Reproducible High Mobilities without Annealing |
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Authors: | Junying Liu Rui Zhang Itaru Osaka Sarada Mishra Anna E Javier Detlef‐M Smilgies Tomasz Kowalewski Richard D McCullough |
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Affiliation: | 1. Department of Chemistry Carnegie Mellon University 4400 Fifth Avenue, Pittsburgh, PA 15213 (USA);2. Cornell High Energy Synchrotron Source (CHESS) Cornell University, Ithaca, NY 14853 (USA) |
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Abstract: | New solution processable 4‐(2‐hexyldecan)‐4H‐bisthieno2,3‐d:3′,2′‐b]pyrrole and 4,4′‐dialkyl‐2,2′‐bithiazole‐based copolymers (PBTzDTPs) are synthesized with excellent FET performance. These novel copolymers have considerable potential in printable electronics as they have high charge carrier mobilities, excellent air stability, good solution processibility, and no requirement for post‐deposition thermal annealing, all requirements for this field of application. The thin film transistors fabricated from PBTzDTPs achieve field effect mobilities as high as 0.14 cm2 V?1 s?1 with current on/off ratios up to 106 without thermal annealing. In addition, the devices exhibit stable performance in air, showing no significant degradation over 60 days. Moreover, the polymers described here provide an excellent example of the systems in which higher mobility performance does not require higher crystalline, long‐range ordered structures. Such a system appears to be particularly promising for rapid fabrication techniques, where kinetic conditions usually prevent the development of long‐range order. |
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Keywords: | Bithiazole Field‐effect transistors N‐alkyldithienopyrrole Semiconducting polymers Solution processing |
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