Amorphous Dithenylcyclopentadienone-Carbazole copolymer for Organic Thin-Film Transistors

ORAL

Abstract

We developed a new high performance amorphous donor-acceptor conjugated copolymer consisting dithienylcylclopentadienone subunit as an electron acceptor and carbazole derivative as an electron donor. X-ray diffraction analysis shows no scattering patterns, indicating a disordered amorphous solid is formed. A high on/off current ratio of approximately 10$^{6}$ and a high field effect mobility of 2.24\times$10$^{-2}$ cm$^{2}$ V$^{-1}$s$^{-1}$ were obtained with stable output characteristics. The high performance of the amorphous copolymer is ascribed to the relatively low activation energy and low characteristic temperature obtained from a low temperature transport analysis, reflecting that localization of the charge carrier is not substantial in the film.

*Research was supported in part by Global Research Laboratory of the MEST in Republic of Korea and in part by the UCSB-UCSD-LLNL collaboration. ESHK and EK acknowledge the financial support from MEST/KOSEF under Creative Research Initiative program(CSQR).

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Authors

  • E. Kang

    • Center for Supersolid and Quantum Matter Research, Korea Advanced Institute of Science and Technology

  • J. Yuen

    • Center for Polymers and Organic Solids, University of California, Santa Barbara

  • W. Walker

    • Department of Chemistry and Biochemistry, University of California, Los Angeles

  • Nelson Coates

    • Center for Polymers and Organic Solids, University of California, Santa Barbara
    • Physics, University of California, Santa Barbara

  • S. Cho

    • Center for Polymers and Organic Solids, University of California, Santa Barbara

  • E. Kim

    • Center for Supersolid \& Quantum Matter Research and Physics Department, KAIST, Daejeon, South Korea
    • Center for Supersolid and Quantum Matter Research, Korea Advanced Institute of Science and Technology
    • Department of Physics and Center for Supersolid and Quantum Matter Research, KAIST, Daejeon, South Korea

  • F. Wudl

    • Center for Polymers and Organic Solids, University of California, Santa Barbara