Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 39: Poster Session II
DS 39.9: Poster
Thursday, March 19, 2015, 16:00–18:30, Poster F
Influence of graphene interlayer on CoPc/Pt(111) interface — •Małgorzata Polek1, Hilmar Adler1, Alexander Generalov2, Mathias Glaser1, Milutin Ivanović1, Alexei Preobrajenski2, Johannes Uihlein1, Heiko Peisert1, and Thomas Chassé1 — 1University of Tübingen, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 18, 72076 Tübingen, Germany — 2MAX IV Laboratory, Ole Römers väg 1, 22363 Lund, Sweden
In optoectronic devices based on organic semiconductors such as transition metal phthalocyanines (TMPcs), interactions at interfaces between organic molecules and metal substrates can significantly affect the device performance. The introduction of graphene as an additional buffer layer can help to tune these interactions and thus the electron transport across the interface as recently shown for TMPcs on graphene/Ni(111) [1]. Due to the interfacial doping effect, graphene on Ni(111) is however a rather specific system. We compare therefore CoPc on graphene/Ni(111) to CoPc on graphene/Pt(111). The system was studied using synchrotron radiation based techniques: Photoemission and X-ray absorption spectroscopies (PES, XAS). Thin films of CoPc on Pt(111) and graphene/Pt(111) are composed of well-ordered, flat lying molecules on the substrate surface. Similar to Ni(111), a charge transfer to the central metal atom of CoPc was observed at the interface between CoPc and Pt(111). In contrast to Ni(111) however, the introduction of graphene as an interlayer prevents the charge transfer completely.
[1] J. Uihlein et al., J. Chem. Phys. 2013, 138, 081101.