Resonance and localization effects at a dipolar organic semiconductor interface

Mary P. Steele, Leah L. Kelly, Nahid Ilyas, Oliver L.A. Monti

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The image state manifold of the dipolar organic semiconductor vanadyl naphthalocyanine (VONc) on highly oriented pyrolytic graphite is investigated by angle-resolved two-photon photoemission (AR-TPPE) spectroscopy in the 0 - 1 monolayer regimes. Interfacial charge-transfer from the image potential state of clean graphite populates a near-resonant VONc anion level, identifiable by the graphite image potential state by its distinct momentum dispersion obtained from AR-TPPE. This affinity level is subject to depolarization by the neighboring molecules, resulting in stabilization of this state with coverage. Near a coverage of one monolayer, a hybrid image potentialanion state is also formed, showing progressive localization with coverage. Intensities for all these features develop rather differently with molecular coverage, pointing towards the different types of charge-transfer interactions at play at this interface.

Original languageEnglish (US)
Article number124702
JournalJournal of Chemical Physics
Issue number12
StatePublished - Sep 28 2011

ASJC Scopus subject areas

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


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