Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 37: Poster II: Focused electron beam induced processing for the fabrication of nanostructures (focused session, jointly with O); Nanoengineered thin films; Layer properties: electrical, optical, and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM, XPS, SIMS, RBS,..); Application of thin films

DS 37.15: Poster

Donnerstag, 29. März 2012, 15:00–17:00, Poster E

Thin C₅₈ films on Au(111) — Noelia Bajales¹, Stefan Schmaus¹, Thoshio Miyamachi¹, Wulf Wulfhekel¹, Melani Stendel², Alexej Bagrets², Christian Seiler², Ferdinand Evers², Seyithan Ulas³, Bastian Kern³, •Artur Böttcher³, and Manfred Kappes³ — ¹KIT, Physikalisches Institut, Karlsruhe, Germany — ²KIT, Institut für Theorie der Kondensierten Materie, Karlsruhe, Germany — ³KIT, Institut für Physikalische Chemie, Karlsruhe, Germany

C₅₈ cages have been deposited on the Au(111) surface by means of low-energy cluster beam deposition technique. The properties of thin C₅₈ films have been studied by means of scanning tunneling microscopy, 4K-STM, elastic tunneling spectroscopy, STS, ultraviolet photoionization spectroscopy, UPS, and thermal desorption spectroscopy, TDS. In the very initial deposition stages the individual C₅₈ cages occupy the elbows of the herringbone reconstruction preferentially. In contrast to highly symmetric C₆₀ cages individual C₅₈ cages exhibit internal asymmetric structures. Further film growth proceeds via formation of dimers and trimers which act as nucleation centers and govern the growth of 2D and 3D islands. Individual cages can not be desorbed from the surface, i.e. their estimated binding energy overcomes  3 eV. For coverages >0.5 MLE detectable emission of C₅₈ cages peaked at  820 K has been observed. This desorption band reveals the thermal decomposition of the quasi-covalent intercage bonds, C₅₈-C₅₈. STS reveals highly asymmetric distribution of the local density of HOMO and LUMO states. For thick C₅₈ films a gap of 1.2 eV has been derived.