Air-stable and balanced split-gate organic transistors

Hocheon Yoo, Masahiro Nakano, Sungmin On, Hyungju Ahn, Han Koo Lee, Kazuo Takimiya, Jae Joon Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ambipolar organic electronics have been gaining interest as a simple alternative technology for implementing complementary-like circuits. Although practical applications require stable operation in the air, most previous studies on ambipolar organic electronics have reported results measured in high vacuum or N2 atmosphere only. This is because ambipolar properties change to asymmetric p-type dominant or unipolar p-type characteristics when exposed to air. Little effort has been put into the fundamental investigation of the effects of the environmental atmosphere on ambipolar organic semiconductors. In this paper, we demonstrate ambipolar OTFTs with balanced p/n characteristics under ambient air using poly{[N,N′-bis(3-decylpentadecyl)-naphtho[2,3-b:6,7-b′]dithiophene-4,5,9,10-tetracarboxidiimide-2,7-diyl]-alt-5,5′-(2,2′-bithiophene)} (PNDTI-BT-DP). Based on the analysis using XPS, UPS, and electrical characterizations at various atmosphere, we concluded that the PNDTI-BT-DP has 0.45 eV higher than the target value for ambiplar charge injections with respect to Au contact electrode. The energy level of the PNDTI-BT-DP was up-shifted by 0.45 eV when the film was exposed to ambient air, which resulted in a change in the electrical properties. As a proof-of-concept application, we demonstrate the air-stable split-gate OTFTs that operate as either a unipolar p- or n-type device based on electrical control. Finally, we report results showing that the device characteristics for both p- or n-type operations were maintained after ∼120 h of atmospheric exposure.

Original languageEnglish
Pages (from-to)200-206
Number of pages7
JournalOrganic Electronics
Volume63
DOIs
Publication statusPublished - 2018 Dec 1

Keywords

  • Air-exposure effects
  • Air-stable
  • Ambipolar semiconductors
  • Multi-gate device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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  • Cite this

    Yoo, H., Nakano, M., On, S., Ahn, H., Lee, H. K., Takimiya, K., & Kim, J. J. (2018). Air-stable and balanced split-gate organic transistors. Organic Electronics, 63, 200-206. https://doi.org/10.1016/j.orgel.2018.09.022