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Conductivity maxima in electrolyte-gated transistors with molecular-doped semiconducting polymer films

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Abstract

In contrast to that of conventional inorganic semiconductor materials, the physics of the doping of π-conjugated organic materials is poorly understood. Therefore, this study aimed to investigate the mechanisms underlying the doping of polymer semiconductors. Electrolyte-gated transistors (EGTs) were used to electrochemically modulate the driving force for the molecular-ion doping of π-conjugated-semiconducting polymer films. Electrochemical transistors were fabricated in which 1-ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl) ([EMIM][TFSI]) and tetrafluoro-tetracyanoquinodimethane (F4-TCNQ)-doped poly(2,5-bis(3-tetradecylthiophen-2yl)thieon(3,2-b)thiophene) (PBTTT-C14) polymer films were used as the electrolyte gate medium and conducting channel layer, respectively. The EGTs with F4-TCNQ-doped PBTTT-C14 films showed conductivity maxima of ~ 600 S/cm at a critical gate bias, which indicated that there was negative transconductance at gate biases above this threshold. The conductivity maxima of the EGTs with F4-TCNQ-doped PBTTT-C14 films were caused by excess doping via ion exchange between the [TFSI] anion of the ionic liquid and the F4-TCNQ anion.

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Acknowledgements

This research was supported by the Pukyong National University Development Project Research Fund (2022).

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Authors and Affiliations

  1. Department of Smart Green Technology Engineering, Pukyong National University, Busan, 48513, Republic of Korea

    Ju Han Lee & Jiyoul Lee

  2. Department of Industrial Chemistry, Pukyong National University, Busan, 48513, Republic of Korea

    Dong Wook Chang

  3. Department of Materials System Engineering, Pukyong National University, Busan, 48513, Republic of Korea

    Junghwan Kim

  4. Department of Nanotechnology Engineering, Pukyong National University, Busan, 48513, Republic of Korea

    Jiyoul Lee

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  1. Ju Han Lee
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Correspondence to Jiyoul Lee.

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Lee, J.H., Chang, D.W., Kim, J. et al. Conductivity maxima in electrolyte-gated transistors with molecular-doped semiconducting polymer films. J. Korean Phys. Soc. 82, 491–496 (2023). https://doi.org/10.1007/s40042-023-00746-5

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  • DOI: https://doi.org/10.1007/s40042-023-00746-5

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