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Reduced electrical hysteresis of organic thin-film transistors based on small molecule semiconductor through an insulating polymer binder

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Abstract

The electrical stability of organic thin film transistors (OTFTs) based on 6, 13-bis(triisopropylsilylethynyl) (TIPS) pentacene were improved by blending poly(α-methylstyrene) (PαMS) binder with the TIPS-pentacene. The blended semiconducting film is vertically phase-separated, which forms a TIPS-pentacene rich region at top surface due to its lower surface energy than PαMS, inducing interface modification at semiconducting layer and dielectric layer. The modified interface induces an increase in charge current density and a decrease in charge trap density, leading to efficiently reduced electrical hysteresis and increased field-effect mobility.

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Acknowledgement

This work was supported by a grant from Kyung Hee University in 2018 (KHU-20182218). Also, this work was supported by the Gachon University research fund of 2018 (GCU-2018-0364).

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Authors and Affiliations

  1. IPF - Leibniz-Institut für Polymerforschung Dresden e.V, Institute of Physical Chemistry and Polymer Physics, 01069, Dresden, Germany

    Soosang Chae

  2. Department of Materials Science and Engineering, Gachon University, Seongnam, 13120, Korea

    Tae Il Lee

  3. Department of Chemical Engineering (Integrated Engineering Program), Kyung Hee University, Yongin, 17104, Korea

    Jin Young Oh

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  1. Soosang Chae
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  2. Tae Il Lee
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  3. Jin Young Oh
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Correspondence to Tae Il Lee or Jin Young Oh.

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Chae, S., Lee, T.I. & Oh, J.Y. Reduced electrical hysteresis of organic thin-film transistors based on small molecule semiconductor through an insulating polymer binder. Korean J. Chem. Eng. 39, 499–503 (2022). https://doi.org/10.1007/s11814-021-1005-z

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  • DOI: https://doi.org/10.1007/s11814-021-1005-z

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