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Orientation-dependent ionization energies and interface dipoles in ordered molecular assemblies.

Steffen Duhm1, Georg Heimel, Ingo Salzmann

  • 1Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany. duhm@physik.hu-berlin.de

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|February 12, 2008
PubMed
Summary

Controlling molecular orientation in organic films allows tuning ionization potential. This surface dipole phenomenon, distinct from metal surfaces, enables design of advanced organic electronic devices.

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Area of Science:

  • Surface Science
  • Organic Electronics
  • Physical Chemistry

Background:

  • Individual molecules possess a single ionization potential.
  • Molecules in ordered assemblies exhibit multiple ionization potentials.
  • Understanding factors influencing molecular ionization in condensed phases is crucial.

Purpose of the Study:

  • To investigate the origin of multiple ionization potentials in ordered molecular assemblies.
  • To explore the role of molecular electronic structure and orientation in surface dipole formation.
  • To provide guidelines for tailoring ionization potentials in organic electronic devices.

Main Methods:

  • Photoelectron spectroscopy of pi-conjugated organic compounds on metal substrates.
  • First-principles calculations.
  • Electrostatic modeling.

Main Results:

  • A surface dipole, intrinsic to molecular layers, was identified.
  • This dipole originates from molecular electronic structure and orientation, differing from metal surface dipoles.
  • Molecular orientation control via substrate pre-patterning adjusted ionization potential by up to 0.6 eV.

Conclusions:

  • Molecular orientation is a key factor in controlling ionization potential in organic assemblies.
  • The findings offer design principles for organic-organic heterojunctions and charge injection layers.
  • This work facilitates the development of more efficient organic electronic devices.