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

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.
Authors:
; ; ; ; ;  [1] ; ; ;  [2]
  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)
Publication Date:
OSTI Identifier:
22415481
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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