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Improved Electron Transport in Ambipolar Organic Field-Effect Transistors with PMMA/Polyurethane Blend Dielectrics

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Abstract

We report improved electron transport in solution-processed ambipolar organic field-effect transistors (OFETs) employing polymer dielectric blends of low-k poly(methyl methacrylate) (PMMA) and polyurethane (PU) elastomer. Ambipolar poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) OFETs typically showed an unbalanced hole and electron mobilities of 8.7 ± 0.4 × 10−4 and 2.0±0.1 × 10−4cm2V−1V−1 respectively, using neat PMMA gate dielectric. By controlling the blending ratio of PU (0∼50 v%) in the PMMA-PU blend dielectrics, we tuned the charge carrier transport in the F8BT OFETs. The electron mobility gradually increases significantly, resulting in nearly perfect ambipolar characteristics with hole and electron mobilities of 6.0 ± 0.7 × 10−4 and 9.7 ± 0.4 × 10−4 cm2V−1V−1 respectively in PMMA: PU blend of 50:50 v%. The remarkable trend ensues from trapping of hole carriers at the dielectric/semiconductor by the -N-H- and carbonyl group (C=O) interface dipoles in the PU dielectric. The PMMA-PU blend dielectrics demonstrate excellent potentials for high-performance ambipolar OFETs, inverters, and complementary circuits.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT, MSIT) (NRF-2020R1G1A1011577, 2013M3A6A5073183, and 2014M3A6A5060932).

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Authors and Affiliations

  1. Department of Energy and Materials Engineering, Dongguk University, 30 Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Korea

    Grace Dansoa Tabi, Benjamin Nketia-Yawson & Jea Woong Jo

  2. Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra, 2601, Australia

    Grace Dansoa Tabi

  3. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea

    Young-Yong Noh

Authors
  1. Grace Dansoa Tabi
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  2. Benjamin Nketia-Yawson
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  3. Jea Woong Jo
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  4. Young-Yong Noh
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Correspondence to Benjamin Nketia-Yawson or Young-Yong Noh.

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Tabi, G.D., Nketia-Yawson, B., Jo, J.W. et al. Improved Electron Transport in Ambipolar Organic Field-Effect Transistors with PMMA/Polyurethane Blend Dielectrics. Macromol. Res. 28 (Suppl 1), 1248–1252 (2020). https://doi.org/10.1007/s13233-020-8161-6

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  • DOI: https://doi.org/10.1007/s13233-020-8161-6

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