Electronic structure at transition metal phthalocyanine-transition metal oxide interfaces: Cobalt phthalocyanine on epitaxial MnO films

Journal Article · Sat Mar 14 04:00:00 EDT 2015 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4907899· OSTI ID:22415481

Glaser, Mathias; Peisert, Heiko; Adler, Hilmar; Aygül, Umut; Ivanovic, Milutin; Chassé, Thomas ^[1]; Nagel, Peter; Merz, Michael; Schuppler, Stefan ^[2]

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1. Institut für Physikalische und Theoretische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen (Germany)
2. Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe (Germany)

The electronic structure of the interface between cobalt phthalocyanine (CoPc) and epitaxially grown manganese oxide (MnO) thin films is studied by means of photoemission (PES) and X-ray absorption spectroscopy (XAS). Our results reveal a flat-lying adsorption geometry of the molecules on the oxide surface which allows a maximal interaction between the π-system and the substrate. A charge transfer from MnO, in particular, to the central metal atom of CoPc is observed by both PES and XAS. The change of the shape of N-K XAS spectra at the interface points, however, to the involvement of the Pc macrocycle in the charge transfer process. As a consequence of the charge transfer, energetic shifts of MnO related core levels were observed, which are discussed in terms of a Fermi level shift in the semiconducting MnO films due to interface charge redistribution.

• OSTI ID: 22415481
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 10 Vol. 142; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ADSORPTION
ATOMS
COBALT COMPLEXES
COBALT COMPOUNDS
ELECTRONIC STRUCTURE
EPITAXY
FERMI LEVEL
INTERFACES
MANGANESE OXIDES
MOLECULES
PHOTOELECTRON SPECTROSCOPY
PHTHALOCYANINES
SUBSTRATES
SURFACES
THIN FILMS
X-RAY SPECTROSCOPY