Morphology dependent interaction between Co(II)-tetraphenylporphyrin and the MgO(100) surface

Ninova, Silviya
Malcıoğlu, Osman Barış
Auburger, Philipp
Franke, Matthias
Lytken, Ole
Steinrueck, Hans-Peter
Bockstedte, Michel
Porphyrins are key elements in organic-inorganic hybrid systems for a wide range of applications. Understanding their interaction with the substrate gives a handle on structural and electronic device properties. Here we investigate a single transition-metal porphyrin, namely Co(II)-tetraphenylporphyrin (CoTPP), on the MgO(100) surface and the effect of multilayer film formation within hybrid density-functional theory and many-body perturbation theory. We focus on the relevant adsorption sites, simulate their photoemission spectra as a key fingerprint and compare with experiments on MgO(100) films on Ag(100). While we find only weak interaction between the cobalt centre and terrace sites on the MgO(100) surface, a strong interaction manifests itself with the low-coordinated sites. This leads to distinct features in both the valence and core-level regions of the electronic structure, as observed in the ultraviolet and X-ray photoemission spectra, corroborated by simulated spectra and calculated cobalt core-level shifts. Our work thus demonstrates the relevance of morphology-related low-coordinated sites and their properties in the adsorption of CoTPP on the MgO(100) surface.

Citation Formats
S. Ninova et al., “Morphology dependent interaction between Co(II)-tetraphenylporphyrin and the MgO(100) surface,” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, vol. 23, no. 3, pp. 2105–2116, 2021, Accessed: 00, 2021. [Online]. Available: