SKM 2021 – scientific programme

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DS: Fachverband Dünne Schichten

DS 7: Thin Oxides and Organic Thin Films (joint session DS/CPP)

DS 7.3: Talk

Thursday, September 30, 2021, 15:45–16:00, H5

Arrangement and electronic properties of cobalt phthalocyanine molecules on Si(111) (√3×√3) R30^∘-B — •Milan Kubicki, Martin Franz, Susi Lindner, Holger Eisele, and Mario Dähne — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

The formation of self-assembled monolayers of organic molecular materials on solid surfaces is an important subject because of their possible application in advanced optical and electronic devices. Here, the molecular arrangement and the interfacial electronic properties of cobalt phthalocyanine (CoPc) on the deactivated Si(111) (√3×√3) R30^∘-B surface are studied by scanning tunneling microscopy and spectroscopy [1,2]. It is found that for submonolayer coverages the CoPc molecules lie flat on the Si surface with the Co d_z² orbital of the molecule forming a hybrid state with the p_z orbital of the Si adatom at the surface. For multilayer coverages in contrast, the CoPc molecules are tilted with respect to the Si surface forming highly ordered organic molecular films, and the electronic properties resemble those of pure CoPc.

[1] S. Lindner, M. Franz, M. Kubicki, S. Appelfeller, M. Dähne, and H. Eisele, Phys. Rev. B 100, 245301 (2019).

[2] M. Kubicki, S. Lindner, M. Franz, H. Eisele, and M.Dähne, J. Vac. Sci. Technol. B 38, 042803 (2020).