Effects of the F₄TCNQ-Doped Pentacene Interlayers on Performance Improvement of Top-Contact Pentacene-Based Organic Thin-Film Transistors

Ching-Lin Fan; Wei-Chun Lin; Hsiang-Sheng Chang; Yu-Zuo Lin; Bohr-Ran Huang

doi:10.3390/ma9010046

Effects of the F₄TCNQ-Doped Pentacene Interlayers on Performance Improvement of Top-Contact Pentacene-Based Organic Thin-Film Transistors

Materials (Basel). 2016 Jan 13;9(1):46. doi: 10.3390/ma9010046.

Authors

Ching-Lin Fan^{1

2}, Wei-Chun Lin³, Hsiang-Sheng Chang⁴, Yu-Zuo Lin⁵, Bohr-Ran Huang⁶

Affiliations

¹ Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. clfan@mail.ntust.edu.tw.
² Graduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. clfan@mail.ntust.edu.tw.
³ Graduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. D10019005@mail.ntust.edu.tw.
⁴ Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. M10002340@mail.ntust.edu.tw.
⁵ Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. D9802312@mail.ntust.edu.tw.
⁶ Graduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da'an District, Taipei City 106, Taiwan. huangbr@mail.ntust.edu.tw.

Abstract

In this paper, the top-contact (TC) pentacene-based organic thin-film transistor (OTFT) with a tetrafluorotetracyanoquinodimethane (F₄TCNQ)-doped pentacene interlayer between the source/drain electrodes and the pentacene channel layer were fabricated using the co-evaporation method. Compared with a pentacene-based OTFT without an interlayer, OTFTs with an F₄TCNQ:pentacene ratio of 1:1 showed considerably improved electrical characteristics. In addition, the dependence of the OTFT performance on the thickness of the F₄TCNQ-doped pentacene interlayer is weaker than that on a Teflon interlayer. Therefore, a molecular doping-type F₄TCNQ-doped pentacene interlayer is a suitable carrier injection layer that can improve the TC-OTFT performance and facilitate obtaining a stable process window.

Keywords: F4TCNQ; Teflon; carrier injection layer; organic thin-film transistors (OTFTs); pentacene.

Publication types

Letter