Abstract
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 language | English (US) |
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Article number | 124702 |
Journal | Journal of Chemical Physics |
Volume | 135 |
Issue number | 12 |
DOIs | |
State | Published - Sep 28 2011 |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry