Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Metal substrates: Adsorption of organic / bio molecules VII

O 52.12: Talk

Thursday, March 26, 2009, 17:45–18:00, SCH A118

STM and STS study of F₁₆CoPc adsorbed onto Ag(110) surface — •Marius Toader¹, Thiruvancheril G. Gopakumar², Mahmoud Abdel-Hafiez¹, and Michael Hietschold¹ — ¹Chemnitz University of Technology, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany — ²Christian-Albrechts-Universität zu Kiel, Institute of Experimental and Applied Physics, D-24118 Kiel, Germany

In this work the adsorption of cobalt(II) hexadecafluoro-phthalocyanine (F₁₆CoPc), one of the few organic n-type semiconductors, onto silver (110) surface prepared by OMBD is investigated using UHV VT-STM from Omicron operating at 40 K. The asymmetry of the metal substrate is found to act as a template for the organic adlayer which grows preferentially along the [1-10] crystallographic axis leading to a commensurate structure with well defined pinning centers. The proposed structural model is strongly sustained by the molecular self assembly at the defects proximity and especially at the domain boundaries where a mirror structure is induced. The perturbed electronic properties like HOMO-LUMO gap, induced new states close to the Fermi level are illustrated using STS. Single molecule DFT calculations are implemented to understand the mechanism responsible for the organic-metal interface formation from STS.