Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Transport: Poster Session
TT 22.48: Poster
Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B
Electrical Characterization of Molecular Monolayers using Micro-Transfer Printing — •Christian Kreuter, Artur Erbe, Stefan Bächle, and Elke Scheer — Department of Physics, University of Konstanz, D-78457 Konstanz
The formation, characterization and understanding of metal-molecule contacts are necessary preconditions for the development of future molecular-electronic devices. Although in the past 20 years various techniques of contacting single molecules and layers of molecules have been developed, establishing a stable metal-molecule contact is still a challenge. Another serious problem is to separate artifacts which arise from to the used contacting technique from molecule-based properties.
Here we demonstrate a Micro-Transfer Printing (µTP) Technique to contact a molecular monolayer of thiol molecules on GaAs and other substrates. We also present measurements of the current-voltage(I-V) characteristics of a monolayer of dithiolated molecules as a function of temperature and light. At low temperatures, we find asymmetries in the IV-characteristics which can be ascribed to the specific influence of the molecules. Further on, it is shown that the current flow through the device can be strongly affected by light. The dependence of the conductance in relation to the area of contact (typically about 20-100 µm2) is studied in order to understand the quality of the metal-molecule contact.