Dresden 2011 – wissenschaftliches Programm
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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.