Improving charge injection in organic thin-film transistors with thiol-based self-assembled monolayers

Patrick Marmont, Nicolas Battaglini, Philippe Lang, Gilles Horowitz, Jaehyung Hwang, Antoine Kahn, Claire Amato, Patrick Calas

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

The aim of this work is to improve charge injection by interposing an appropriately oriented dipole layer between contact and semiconductor in organic thin-film transistors (OTFTs). OTFTs are fabricated with pentacene semiconductor and gold source and drain contacts. The contacts are modified with self-assembled monolayers (SAMs) made of alkane or fluorinated alkane thiols. Ultraviolet photoelectron spectroscopy (UPS) shows a respective decrease and increase of the work function of the electrodes. Consistent with these results, we observe an increase and a decrease, respectively, of the contact resistance of the OTFTs, and a further decrease when shortening the length of the fluorinated molecule.

Original languageEnglish (US)
Pages (from-to)419-424
Number of pages6
JournalOrganic Electronics
Volume9
Issue number4
DOIs
StatePublished - Aug 2008

All Science Journal Classification (ASJC) codes

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

Keywords

  • Atomic force microscopy
  • Contact resistance
  • Organic thin-film transistor
  • Self-assembled monolayers
  • Ultraviolet photoelectron spectroscopy

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