Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 28: Organic-Inorganic Systems I: PTCDA

O 28.8: Talk

Tuesday, March 8, 2016, 12:30–12:45, S054

Controlling the electronic properties of heteromolecular monolayers without affecting their structure through exchange of the phthalocyanine central metal atom — •Gerben van Straaten¹, Benjamin Stadtmüller², Markus Franke¹, and Christian Kumpf¹ — ¹Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich GmbH, Jülich, Germany, and Jülich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology — ²Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany

Planar aromatic molecules in a mixed monolayer can indirectly influence each other leading to charge transfer from one molecule to the other via the substrate[1]. This effect provides new ways to tailor the properties of metal-organic interfaces but it’s application is complicated by the fact that exchanging the molecular species can change the lateral ordering. This can be avoided when phthalocyanine molecules are used since their interaction with neighboring molecules is largely independent of the central metal atom. Taking advantage of this we prepared mixed monolayers of SnPC and PTCDA on Ag(111) and compared them with known CuPC + PTCDA monolayers exhibiting the same lateral structure[1]. We observed a shift of the PTCDA FLUMO and surprising changes in the vertical adsorption structure, proving that this technique allows tuning of the organic-metal interface properties independently of the lateral structure.

[1] Benjamin Stadtmüller et al., Nature Communications 5 (2014)