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 journalArticle

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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