Resonance and localization effects at a dipolar organic semiconductor interface.
J Chem Phys
; 135(12): 124702, 2011 Sep 28.
Article
em En
| MEDLINE
| ID: mdl-21974547
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 potential/anion 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.
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Base de dados:
MEDLINE
Assunto principal:
Compostos Organometálicos
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Semicondutores
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Vanádio
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article