Original Article

The European Physical Journal E

, Volume 17, Issue 3, pp 339-343

First online:

The effect of oxygen exposure on pentacene electronic structure

  • A. VollmerAffiliated withBerliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H.
  • , O. D. JurchescuAffiliated withMaterials Science Center, Rijksuniversiteit Groningen
  • , I. ArfaouiAffiliated withMaterials Science Center, Rijksuniversiteit Groningen
  • , I. SalzmannAffiliated withInstitut f. Physik, Humboldt-Universität zu Berlin
  • , T. T. M. PalstraAffiliated withMaterials Science Center, Rijksuniversiteit Groningen
  • , P. RudolfAffiliated withMaterials Science Center, Rijksuniversiteit Groningen
  • , J. NiemaxAffiliated with3. Physikalisches Institut, Universität Stuttgart
  • , J. PflaumAffiliated with3. Physikalisches Institut, Universität Stuttgart
  • , J. P. RabeAffiliated withInstitut f. Physik, Humboldt-Universität zu Berlin

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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