Enhanced Charge Injection Properties of Organic Field Effect Transistor via Molecular Implantation Doping

ORAL

Abstract

Organic semiconductors (OSCs) have been widely studied due to their merits such as mechanical flexibility, solution processability, and large-area fabrication. However, because of the Schottky contact at the metal/OSC interfaces, a non-ideal transfer curve feature often appears in the low drain voltage region. Here, we demonstrated a selective contact doping of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) by solid-state diffusion in poly 2,5-bis(3-hexadecylthiophen-2-yl) thieno [3,2-b] thiophene (PBTTT) to enhance carrier injection in bottom-gate PBTTT organic field effect transistors (OFETs). This doping exhibited a high conductivity with favorable charge transport properties [1]. Furthermore, we investigated the effect of post-doping treatment on diffusion of F4-TCNQ molecules in order to improve the device stability. In addition, the application of the doping technique to the low-voltage operation of PBTTT OFETs with high-k gate dielectrics demonstrated a potential for designing scalable and low-power organic electronic devices by utilizing doping of conjugated polymers.

References
[1] K. Kang et al., Nat. Mater., 15, 896 (2016).

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Presenters

  • Youngrok Kim

    Physics and Astronomy, Seoul National University

Authors

  • Youngrok Kim

    Physics and Astronomy, Seoul National University

  • Seungjun Chung

    Korea Institute of Science and Technology, Photoelectronic Hybrids Research Center, Korea Institute of Science and Technology

  • Kyungjune Cho

    Physics and Astronomy, Seoul National University, Seoul National University

  • David Harkin

    University of Cambridge

  • Wang-Taek Hwang

    Physics and Astronomy, Seoul National University, Seoul National University

  • Daekyoung Yoo

    Physics and Astronomy, Seoul National University

  • Jae-Keun Kim

    Physics and Astronomy, Seoul National University, Seoul National University

  • Woocheol Lee

    Physics and Astronomy, Seoul National University

  • Younggul Song

    Electrical and Computer Engineering, Seoul National University

  • Heebeom Ahn

    Physics and Astronomy, Seoul National University

  • Yongtaek Hong

    Electrical and Computer Engineering, Seoul National University

  • Henning Sirringhaus

    University of Cambridge

  • Keehoon Kang

    Physics and Astronomy, Seoul National University, Seoul National University

  • Takhee Lee

    Physics and Astronomy, Seoul National University, Seoul National University