Synthesis of Narrow Bandgap Polymers based on Benzobis(thiadiazole) and their Application to Organic Transistor Devices

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  • Mamada Masashi
    Graduate School of Science and Engineering, Yamagata University
  • Uemura Taisuke
    Graduate School of Science and Engineering, Yamagata University
  • Teraoka Ryo
    Graduate School of Science and Engineering, Yamagata University
  • Kumaki Daisuke
    Graduate School of Science and Engineering, Yamagata University
  • Tokito Shizuo
    Graduate School of Science and Engineering, Yamagata University

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Two newly developed narrow bandgap polymers containing benzobis(thiadiazole) (BBT) have been synthesized using the Stille coupling reaction. The polymers showed absorption in the near infrared region due to strong charge-transfer interactions in the donor-acceptor (D-A) units, suggesting a rigid planarized structure. Although both the HOMO-LUMO levels of the polymers lie close to the work function of gold electrodes, a BBT-quaterthiophene polymer showed only p-type semiconducting behavior. In addition, the dominant charge-carrier type is holes even in BBT-thiazole-thiophene polymers, which consists mainly of acceptor units, and indicates that the thiophene ring in these polymers has a strong influence on the charge transport properties.

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