Image states at the interface with a dipolar organic semiconductor

Mary P. Steele, Michael L. Blumenfeld, Oliver L.A. Monti

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Image states of the dipolar organic semiconductor vanadyl naphthalocyanine on highly oriented pyrolytic graphite are investigated in the submonolayer to few monolayer regime. The presence of a significant molecular dipole in the organized thin films leads to a strong modification of the image states with coverage. In the 0-1 ML regime, we observe successive stabilization of the image state with increasing coverage. Above 1 ML, a new image state develops, corresponding to the screened interaction at the organic semiconductor/substrate interface. We show that the evolution of the observed image states can be understood on the basis of resonance-enhanced anion formation in the presence of strong electric fields. These data represent a step toward understanding the influence of electrostatic fields on electronic structure at organic semiconductor interfaces.

Original languageEnglish (US)
Article number124701
JournalJournal of Chemical Physics
Issue number12
StatePublished - Sep 28 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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