Single electron transistor with a single conjugated molecule

Sergey Kubatkin*, Andrey Danilov, Mattias Hjort, Jérôme Cornil, Jean-Luc Bredas, Nicolai Stuhr-Hansen, Per Hedegård, Thomas Bjørnholm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We report on a single electron transistor (SET) where the electronic levels of a single π-conjugated molecule control the electron transport properties. The molecule can be in several distinct charged states from +3 to -4. The experiment closely resembles electrochemical measurements allowing us to report on quantitative measurements of the redox potentials (or ionization potentials) of a single molecule in a solid state device. The molecular excitation energies extracted from the SET measurements are strongly correlated with electrochemical data. In contrast, the HOMO-LUMO gap is strongly reduced in a solid state environment, as compared to solution. We suggest that this surprising effect may be caused by image charges generated in the source and drain electrodes. They will result in a strong localization of the charges on the molecule.

Original languageEnglish (US)
Pages (from-to)554-558
Number of pages5
JournalCurrent Applied Physics
Volume4
Issue number5
DOIs
StatePublished - Aug 1 2004

Keywords

  • Image charges
  • Molecular electronics
  • Redox states
  • Single electron tunneling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces

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