Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 31: Organic thin films II
DS 31.6: Talk
Thursday, March 14, 2013, 16:00–16:15, H8
Growth and stability: The impact of fluorination of pentacene on Cu(111) — •Hendrik Glowatzki1,2, Georg Heimel3, Antje Vollmer1, Swee Liang Wong2, Han Huang2, Wei Chen2, Andrew T. S. Wee2, Jürgen P. Rabe3, and Norbert Koch3 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Bessy II, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 2National University of Singapore, Department of Physics, 2 Science Drive 3, 117542, Singapore — 3Humboldt -Universität zu Berlin, Institut für Physik, Newtonstr. 15, D-12489 Berlin, Germany
In this study, the organic semiconductor pentacene (PEN) and its fully fluorinated analogue perfluoropentacene (PFP) were investigated on Cu(111) by STM, LEED, UPS and XPS. While PEN molecules at room temperature could only be imaged by STM at full monolayer coverage, PFP was found to stabilize in disordered clusters already in the sub-monolayer regime. Moreover, PFP formed only a disordered first wetting layer, whereas for PEN long-range order was already observed for closed molecular monolayers. However, highly ordered domains of PFP molecules were found for the second layer. Supported by additional STM measurements on graphite and theoretical modelling, it was concluded that the molecular planes in this layer are inclined to the surface. Therefore, careful consideration of the structural details in the transitional growth regime from molecular mono- to multilayers emerges as a key factor to achieving a deeper understanding of metal/organic interfaces relevant for organic electronic devices.