Mittwoch, 01. Juni 2016, 09:30 - 10:30 iCal

Gastvortrag von M. BAGHBANZADEH (Harvard Univ.)

EGaIn Junction: Towards Understanding Molecules in Molecular Electronics

Chemische Institute, Seminarraum 2, Raum 2124
Währinger Straße 42, 1090 Wien

Seminar, Workshop, Kurs

The flow of electrical currents is ubiquitous in modern technology. The mechanisms that govern electrical conductors (metals), and electrical insulators are well understood. There are, however, other materials and processes that allow conduction, but are less well understood. When electrical insulators are sufficiently thin (1-2 nanometers) they can allow charge to move between electrodes across an insulating barrier by a process called “tunnelling”.

This talk will cover the recent progress that has been made in the Whitesides lab during the last three years towards understanding tunnelling of charge through insulating self-assembled monolayers (SAMs) of organic molecules.

We, in the Whitesides lab, try to corre¬late rates of charge transport with the structures (chemical, physical, and electronic) of the organic insulators, and to relate these measurements to theories of charge transport. We chose to use a junc¬tion developed specifically for this purpose (the so-called “EGaIn” junction). This junction has three parts: i) a bottom electrode made of flat gold or silver; ii) a SAM of an organic or organometallic compound; iii) a top electrode made from a compliant structure composed of a drop of liquid eutectic gallium-indium alloy (EGaIn), covered by a thin conducting film of gallium oxide. In use, this drop is formed into a conical tip with a macroscopic contact area with the SAM of ca. 100µm2.


Institut für Physikalische Chemie, Universität Wien


Univ.-Prof. Dr. Wolfgang Kautek
Erwin Schrödinger Gesellschaft für Nanowissenschaften & Universität Wien
Institut für Physikalische Chemie
0043 664 60277 52470