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Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Organic/bio Molecules on Metal Surfaces IV

O 42.10: Vortrag

Mittwoch, 13. März 2013, 12:45–13:00, H38

Unconventional self-assembled monolayers with unusual propertiesDavid A. Egger1, Ferdinand Rissner1, Oliver T. Hofmann1, Amir Natan2,3, Leeor Kronik2, Georg Heimel4, and •Egbert Zojer11Institute of Solid State Physics, Graz University of Technology, 8010 Graz, Austria — 2Department of Materials and Interfaces, Weizmann Institute of Science, 76100 Rehovoth, Israel — 3Department of Physical Electronics, 69978 Tel-Aviv University, Tel-Aviv, Israel — 4Institut für Physik, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 6, 12489 Berlin, Germany

We use density-functional theory calculations to show that self-assembled monolayers (SAMs) made from molecules consisting of conjugated distributed dipolar units have unusual properties: * Work-function modifications tuned linearly with the number of repeat units are limited by Fermi-level pinning,[1] where the limitations can be overcome using advanced design strategies.[2] * Collectively induced internal electric fields change the nature of the electronic states within such SAMs in a way strongly reminiscent of the quantum-confined Stark-effect [3] with a closure of the global band-gap beyond a certain number of repeat units. [4] * Moreover, SAMs can be realized that display different polarity of charge transport, in spite of consisting of molecules with virtually identical electronic properties.[5] All these observations can be traced back to collective effects prevalent in such SAMs. [1] Phys.Chem.Chem.Phys., 2010, 12, 4291; [2] Nano Lett. 10, 4369 (2010); [3] J. Am. Chem. Soc. 133, 18634 (2011); [4] Org. El. 13, 3165 (2012); [5] Adv. Mater. 24, 4403 (2012).

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