Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.37: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

FePc/metals: Influence of the 3d-open shell on the interface properties — •Fotini Petraki¹, Heiko Peisert¹, Florian Latteyer¹, Umut Aygül¹, Johannes Uihlein¹, Antje Vollmer², and Thomas Chassé¹ — ¹Universität Tübingen, IPTC, Auf der Morgenstelle 18, 72076 Tübingen, Germany — ²Helmholtz Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany

The present work is focused on transition metal phthalocyanines (TMPcs) and in particular, on iron phthalocyanine (FePc), a two dimensional MPc where the central atom is a Fe2+ ion. The magnetic properties of such molecules depend strongly on the electronic configuration of the central metal atom, and in particular, the occupation of the 3d-related states. Recent studies, on TMPcs (TM: Co, Mn) by X-ray absorption (XAS) and resonant photoemission spectroscopy (ResPES) revealed a quite strong interaction between the TM and metallic substrates through charge transfer towards the 3d unoccupied electronic states.The investigation of FePc/ Au(100) and FePc/ Ag(111) interfaces by XAS and ResPES confirmed strong interactions also at these interfaces. The detailed electronic configuration however, depends on the substrate under consideration. Effects of chemical changes during the interface formation in terms of different oxidation state for the Fe-ion were detected also by XPS, confirming the partial filling of the 3d-open shell of Fe from electrons coming from the metallic substrate. From resonant PES measurements at the Fe-edge information on the local electronic structure of the occupied orbitals was also obtained.