Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and Other

O 49.5: Poster

Tuesday, March 17, 2020, 18:15–20:00, P2/EG

DMEP-Ovalene as Precursor-Molecule for Nanographen on H:Si(100) — •Alexander Kölker, Leonid Shupletsov, Takashi Kumagai, Martin Wolf und Matthias Koch — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany

Electrically contacting single molecules is one of the biggest challenges in nanotechnology. Sophisticated techniques emerged such as break junction [1] and scanning probe microscopy (SPM) [2,3]. However, interpreting the electrical signal without knowledge of the precise chemical composition of the junction is difficult.

We have developed a SPM sample architecture with integrated sub-surface electrodes in Si(001) for multi-terminal conductance measurements to fabricate robust molecular nano-circuits. To place molecules with highest precision between prior fabricated electrodes we will employ STM hydrogen lithography which enables the creation of reactive adsorption sites on the passivated silicon surface.

A first promising candidate to study is nanographene which localized electronic edge states are expected to be energetically located in the silicon band gap region.

Here we report a detailed structural and electronic characterizion of adsorption conformations of Dimethylphenyl-Ovalene (DMEP) on H:Si(001) as function of annealing temperature. STM and STS experiments at 4 K are supported by simulations for a free molecule in gas phase.