Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic-inorganic hybrid systems and organic films I

O 5.7: Vortrag

Montag, 12. März 2018, 12:15–12:30, MA 042

Structural and electronic phase transition at a metal-organic interface — •Patrick Amsalem1,2, Luca Giovanelli2, Oliver Hofmann3, Georg Heimel1, Ahmed Khalladi4, Norbert Koch1,5, Tobias Rüffer4, Thierry Angot2, and Jean-Marc Themlin11Humboldt-Universität zu Berlin & IRIS Adlershof — 2Aix-Marseille Université — 3Graz University of Technology — 4Technische Universität Chemnitz — 5Helmholtz-Zentrum Berlin

The performance of hybrid organic-inorganic devices strongly depends on the interface properties such as the organic / electrode interface. In this context, large research efforts have been devoted to understand the phenomena occurring at interfaces formed between large pi-conjugated molecules and metal surfaces. If much progress has been achieved, the effect of the interplay between molecule-metal and intermolecular interaction on the interface electronic properties is not well-documented yet. Here, we address the structural, vibrational and electronic properties of a long-range ordered sub-monolayer film of octachloro zinc-phthalocyanines (ZnPcCl8) adsorbed on Ag(111), which undergo a structural transition consisting mostly in a decrease of the lattice parameters upon gentle annealing (350 K). The vibrational spectra for the two investigated structural phases reveal strong differences in their electronic properties. In addition, monitoring the change in the valence band features allows to correlate the vibrational features with the amount of charge transfer, as well as with the metallic or insulating character of the hybrid interface.

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