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O: Fachverband Oberflächenphysik

O 75: Metal substrates: Adsorption of organic / bio molecules VIII

O 75.6: Vortrag

Donnerstag, 17. März 2011, 16:15–16:30, PHY C213

Switching and electron transport through Sn-Phthalocyanin — •Yongfeng Wang¹, Jörg Kröger², and Richard Berndt¹ — ¹IEAP, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — ²Technische Universität Ilmenau, 98684 Ilmenau

SnPc exhibits two configurations (SnPc-up and SnPc-down) upon adsorption on Ag(111). A localized but irreversible conformational switching from up to down state was obtained on the bare Ag(111) surface. From the second layer, local and reversible switching was achieved via resonant electron or hole injection into molecular orbitals.

SnPc molecules adsorbed on Ag(111) were contacted with the tip of a STM. Orders-of-magnitude variations of the single-molecule junction conductance were achieved by controllably dehydrogenating the molecule and by modifying the atomic structure of the surface electrode. Nonequilibrium Green's function calculations reproduce the trend of the conductance and visualize the current flow through the junction, which is guided through molecule-electrode chemical bonds.