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The European Physical Journal E

, Volume 17, Issue 3, pp 339–343 | Cite as

The effect of oxygen exposure on pentacene electronic structure

  • A. Vollmer
  • O. D. Jurchescu
  • I. Arfaoui
  • I. Salzmann
  • T. T. M. Palstra
  • P. Rudolf
  • J. Niemax
  • J. Pflaum
  • J. P. Rabe
  • N. KochEmail author
Original Article

Abstract.

We use ultraviolet photoelectron spectroscopy to investigate the effect of oxygen and air exposure on the electronic structure of pentacene single crystals and thin films. It is found that O2 and water do not react noticeably with pentacene, whereas singlet oxygen/ozone readily oxidize the organic compound. Also, we obtain no evidence for considerable p-type doping of pentacene by O2 at low pressure. However, oxygen exposure lowers the hole injection barrier at the interface between Au and pentacene by 0.25 eV, presumably due to a modification of the Au surface properties.

PACS.

73.20.Hb Impurity and defect levels; energy states of adsorbed species 79.60.Fr Polymers; organic compounds 79.60.Jv Interfaces; heterostructures; nanostructures 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • A. Vollmer
    • 1
  • O. D. Jurchescu
    • 2
  • I. Arfaoui
    • 2
  • I. Salzmann
    • 3
  • T. T. M. Palstra
    • 2
  • P. Rudolf
    • 2
  • J. Niemax
    • 4
  • J. Pflaum
    • 4
  • J. P. Rabe
    • 3
  • N. Koch
    • 3
    Email author
  1. 1.Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H.BerlinGermany
  2. 2.Materials Science CenterRijksuniversiteit GroningenGroningenThe Netherlands
  3. 3.Institut f. PhysikHumboldt-Universität zu BerlinBerlinGermany
  4. 4.3. Physikalisches InstitutUniversität StuttgartStuttgartGermany

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