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O: Fachverband Oberflächenphysik

O 44: Metal substrates: Adsorption of organic / bio molecules VI

O 44.8: Talk

Thursday, March 26, 2009, 12:15–12:30, SCH A118

Current-induced switching of PTCDA on Ag(111) — •Olga Neucheva, Christian Weiss, Ruslan Temirov, and Frank Stefan Tautz — Institut für Bio- und Nanosysteme (IBN-3) and JARA-Fundamental of Future Information Technology, Forschungszentrum Jülich, 52425 Jülich, Germany

A low temperature scanning tunneling microscope (LT-STM) has been used to investigate electron transport through a single PTCDA molecule on Ag(111). Under certain conditions, one of the carboxylic oxygen atoms of the PTCDA molecule establishes a chemical bond with the STM tip, forming a covalently bound single molecular junction [1]. In this contribution, we investigate the process of contact formation as a function of parameters such as distance, bias voltage and electrical current through the molecular junction. In a narrow distance and voltage interval, bistable switching of the oxygen atom between a high- and low-conductance state is observed. The implications of this observation are discussed. [1] Temirov R., Lassise A., Anders F.B., et al., Nanotechnology 19 (2008) 065401