Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.1: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Ordered films of the charge-transfer salt DTBDT-F4TCNQ on Au(111) — •Torge Mashoff and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität, Mainz

The interplay of electronic correlation effects with low dimensionality and geometric frustration of charge-transfer compounds provides a large playground for variable many-body interactions. Novel systems of molecules with tailored donor and acceptor character provide a vast multitude of possible modifications. Understanding the electronic structure of this class of materials as well as their metal-organic interfaces is crucial for designing specific electronic properties. An important precondition for the implementation of organic charge-transfer salts in electronic devices is the fabrication of thin films with appropriate molecular orientation. Deposition of films under ultrahigh vacuum (UHV) conditions promises the formation of well-defined interfaces [1]. In this work, an in-situ prepared molecular monolayer of the novel charge-transfer salt dithienobenzodithiophene-tetrafluorotetracyanoquino-dimethane (DTBDT-F4TCNQ) has been deposited on a gold substrate and investigated by low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS), allowing the characterization of occupied and unoccupied electronic states of the donor-acceptor compounds near the Fermi level. [1] D. Bayer et. al., Phys. Rev. B 89, 075435 (2014)