Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Tuesday: Organic Molecules on Inorganic Surfaces

O 42.7: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Understanding the Mechanism of Metalation at Porphyrin/CoO(111) Interfaces with Photoemission Spectroscopy — •Can Wang, Ruimei Wang, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Understanding the electronic structure between porphyrins and metal oxide interfaces is vital for the rational design of functional molecular architectures [1, 2]. Well-ordered thin layers (∼5 ML) of rock-salt structure CoO(111) are expitaxially grown on Ir(100) [3, 4]. Here, we study the electronic properties of porphyrin (2H-DPP and 2H-TPP) films adsorbed on CoO(111) surface by means of photoemission spectroscopy methods. We observed the direct metalation between porphyrin molecules (∼1 ML) and CoO(111) interface at room temperature with N 1s core-level shifts obtained by using XPS measurements. The formation of Co-DPP or Co-TPP lead an additional electronic state located ∼0.4 eV below the Fermi level in UPS spectrum. The UV photoemission data, obtained from monolayer films of 2H-DPP and 2H-TPP also show a large decrease of work function.

[1] W. Auwärter et al., Nat. Chem. 7, (2015) 105.

[2] G. Di Filippo et al., J. Chem. Phys. 146, (2017) 064702.

[3] K. Heinz et al., J. Phys.: Condens. Matter 25, (2013) 173001.

[4] S. Otto and Th. Fauster, J. Phys.: Condens. Matter 28, (2016) 055001.