Work function engineering of electrodes via electropolymerization of ethylenedioxythiophenes and its derivatives

Yumeng Shi, Shyh Chyang Luo, Wenjing Fang, Keke Zhang, Emril Mohamed Ali, F. Y.C. Boey, Jackie Y. Ying, Junling Wang, Hsiao hua Yu*, Lain-Jong Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The work functions of two commonly used electrodes, Au and indium-tin-oxide (ITO), can be modified by surface-electropolymerization of ethylenedioxythiophenes (EDOT) or its derivatives. The resulting work function is tunable continually by varying the electropolymerization condition. The value of work function of ITO (or Au) electrodes can be adjusted to decrease by 0.6 eV (or increase by 0.4 eV) when the deposited EDOT film is thin (<40 nm). By contrast, when the EDOT film deposited with thickness greater than 40 nm, the work function is controlled by the intrinsic property of the polymers regardless of the electrode materials. A diode devices with EDOT-COOH modified on ITO surface demonstrates the possibility of improving contact property in organic electronics using the proposed method.

Original languageEnglish (US)
Pages (from-to)859-863
Number of pages5
JournalOrganic Electronics
Volume9
Issue number5
DOIs
StatePublished - Jan 1 2008

Keywords

  • Electropolymerization
  • PEDOT
  • Work function

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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