Electronic non-equilibrium conditions at C60-pentacene heterostructures

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Autor/in:
Erscheinungsjahr:
2009
Medientyp:
Text
Schlagworte:
  • Photoelectron spectroscopy
  • Work function
  • Level alignment
  • Organic Light Emitting Diodes (OLED)
  • Solar Cells
  • Conjugated Polymers
  • Photoelectron spectroscopy
  • Work function
  • Level alignment
  • Organic Light Emitting Diodes (OLED)
  • Solar Cells
  • Conjugated Polymers
Beschreibung:
  • The electronic structure of vacuum-sublimed layered organic heterostructures of pentacene (PEN) and fullerene (C60) on conducting polymer substrates was investigated using ultraviolet photoelectron spectroscopy (UPS). The conditions at the PEN/C60interface changed from thermodynamic non-equilibrium (i.e. the onset of the PEN highest occupied molecular orbital above the substrate Fermi-energy) for thin PEN coverages on C60 to thermodynamic equilibrium for thicker PEN coverages (i.e. Fermi-level pinning of PEN). This finding is attributed to a coverage-dependent pinhole connection of PEN through the C60 layer with the substrate. The experiments demonstrate the importance of organic thin film morphology for UPS measurements to assess the energy level alignment at organic/organic heterointerfaces. © 2009 Elsevier B.V. All rights reserved.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/981dac9e-b1f7-416f-a318-5b88c8ba8745