Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation

O 28.4: Vortrag

Dienstag, 2. April 2019, 11:15–11:30, H24

Influence of the spatial extent of molecules on their properties as detectors in MONA applications — •Tim Zenger¹, Jens Kügel¹, Markus Leisegang¹, and Matthias Bode^1,2 — ¹Physikalisches Institut, Experimentelle Physik II, *Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Wilhelm Conrad Röntgen Center of Complex Material Systems (RCCM), *Universität Würzburg, Am Hubland, 97074 Würzburg

The Molecular Nanoprobe (MONA) technique [1] takes advantage of dynamic processes in molecules to enable the measurement of electron transport on a nanometer scale via STM. In this technique charge carriers injected from the STM tip propagate through the sample until they are detected by a molecule, usually phthalocyanine, via a reversible proton transfer reaction, called tautomerization. In contrast to a STM probe, however, these macromolecules possess a significant spatial extent that could have an effect on their properties as detectors of electronic transport. Here we present studies of phthalocyanine molecules to investigate the influence of its cross-like arms on the switching properties in MONA measurements. In detail, we show both angular and distance-dependent measurements of the switching probabilities. These results are compared to naphthalocyanine molecules, which are characterized by larger arms.

[1] M. Leisegang et al., Nano Lett. 18, 3, 2165-2171 (2018)