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

Mathias Glaser; Heiko Peisert; Hilmar Adler; Umut Aygül; Milutin Ivanovic; Peter Nagel; Michael Merz; Stefan Schuppler; Thomas Chassé

doi:10.1063/1.4907899

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

J Chem Phys. 2015 Mar 14;142(10):101918. doi: 10.1063/1.4907899.

Authors

Mathias Glaser¹, Heiko Peisert¹, Hilmar Adler¹, Umut Aygül¹, Milutin Ivanovic¹, Peter Nagel², Michael Merz², Stefan Schuppler², Thomas Chassé¹

Affiliations

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.

PMID: 25770507
DOI: 10.1063/1.4907899

Abstract

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.