Low-voltage p- and n-type organic self-assembled monolayer field effect transistors

Michael Novak, Alexander Ebel, Timo Meyer-Friedrichsen, Abdesselam Jedaa, Benito F. Vieweg, Guang Yang, Kislon Voitchovsky, Francesco Stellacci, Erdmann Spiecker, Andreas Hirsch, Marcus Halik

Research output: Contribution to journalArticlepeer-review

Abstract

We report on p- and n-type organic self-assembled monolayer field effect transistors. On the base of quaterthiophene and fullerene units, multifunctional molecules were synthesized, which have the ability to self-assemble and provide multifunctional monolayers. The self-assembly approach, based on phosphonic acids, is very robust and allows the fabrication of functional devices even on larger areas. The p- and n-type transistor devices with only one molecular active layer were demonstrated for transistor channel lengths up to 10 μm. The monolayer composition is proven by electrical experiments and by high-resolution transmission electron microscopy, electron energy loss spectroscopy, XPS, and AFM experiments. Because of the molecular design and the contribution of isolating alkyl chains to the hybrid dielectric, our devices operate at low supply voltages (-4 V to +4 V), which is a key requirement for practical use and simplifies the integration in standard applications. The monolayer devices operate in ambient air and show hole and electron mobilities of 10-5 cm2/(V s) and 10-4 cm2/(V s) respectively. In particular the n-type operation of self- assembled monolayer transistors has not been reported before. Hereby, structure-property relations of the SAMs have been studied. Furthermore an approach to protect the sensitive C60 from immediate degradation within the molecular design is provided.

Original languageEnglish
Pages (from-to)156-159
Number of pages4
JournalNano Letters
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 12 2011

Keywords

  • Low voltage operation
  • Molecular electronics
  • Monolayer transistor
  • Self-assembly

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

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