Self-assembled monolayers as model systems for studying charge transport at organic-inorganic interfaces

Calendar
When:
30 May 2019 04:00 PM - 30 May 2019 05:30 PM
2019-05-30 16:00:00
2019-05-30 17:30:00
Where:
S8-03-14 Executive Classroom (Department of Chemistry)
Speaker: Prof Marc Tornow
Affiliation: Molecular Electronics, TU Munich, Germany
Host: Professor Christian Nijhuis
Abstract Details: 

I will review our recent investigations on the charge transport through molecular self assembled monolayers (SAMs), which sensitively depends on the electronic structure of the molecules, the degree of order in the film and the nature of the organic-inorganic interface to the contacts. Our transport measurements made on organophosphonate monolayers covering a thin oxide on highly doped silicon samples reveal distinct contributions from non-resonant “through-bond”, trap-assisted and “through-space” tunneling. Stacking such monolayers into structurally ordered duplex layers leads to surprising dielectric properties, as measured by impedance spectroscopy. Furthermore, we have fabricated symmetric silicon contact pairs separated by 4 nm in distance, to investigate the charge transport through proteins. At low-temperatures, the measured conductance through cytochrome c is in agreement with tunneling through the formed silicon-protein-silicon junction.

About The Speaker: 

After studying physics in Braunschweig and Heidelberg, Marc Tornow received his doctorate from the University of Stuttgart in 1997 with a dissertation at the Max Planck Institute for Solid State Research. Subsequently, he worked as a postdoctoral fellow at the Weizmann Institute of Science, Israel, and later on the development of RF devices at Infineon Technologies, Munich. From 2001 to 2006 Marc Tornow headed an independent junior research group sponsored by the German Federal Ministry of Education and Research (BMBF) at TUM’s Walter Schottky Institute. He acquired his postdoctoral teaching qualification (habilitation) for his work in the field of experimental physics in 2007 at TUM. Marc Tornow was a professor at TU Braunschweig from 2006 to 2013. In March 2013 he was appointed as professor of molecular electronics at TUM. Since April 2016 Marc Tornow additionally serves as cooperative department head at the Fraunhofer Research Institution for Microsystems and Solid State Technologies (EMFT).

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