Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 25: Organic films II

O 25.2: Talk

Tuesday, March 28, 2006, 16:00–16:15, PHY C213

Combined investigation of the disordered phases of PTCDA on Ag(111) with STM and STS — •Ruslan Temirov, Serguey Soubatch, and Stefan Tautz — International University Bremen, Bremen, Germany

Adsorption of large organic molecules is a topic of increasing importance. Among other materials PTCDA has got a lot of attention as a model system for studying complex absorption phenomena. Due to the unique properties of its chemisorptive bond PTCDA demonstrates a commensurate monolayer growth on Ag(111). Such ordered PTCDA/Ag(111) interface has been characterized recently on atomic scale using STM, STS and NXSW techniques [1],[2]. In our contribution we present a study of the disordered PTCDA overlayers grown on Ag(111) at 100K. We studied the structure and the thermal stability of the layer employing Low Temperature STM. Electronic properties of the interface have been characterized by STS on a single molecular scale. STM induced single molecular manipulation combined with the STS measurements have been used for the tracking of the changes of interface electronic structure during the transition of the disordered film into the ordered one. These data are further used for the identification of the nature of the disordered PTCDA phases on Ag(111).

[1] A. Hauschild et al. Phys. Rev. Lett. 94, 0360106 (2005)

[2] A. Kraft et al. submitted