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Azobenzene

Molecular switches at inorganic surfaces

Molecular switches in which a molecular property such as the conformation is changed in response to an external stimulus (e.g. light or current) are promising candidates for both memory and logic applications. Our research aims at the understanding of fundamental differences in the isomerization behaviour of free molecules and those adsorbed at surfaces (e.g. Ag(111)) which has been observed for some azobenzene-derived molecular switches.

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Hydrogen

Ultra-high resolution STM with hydrogen as a contrast enhancing agent

Condensation of molecular hydrogen in the junction of a low temperature STM strongly affects the tunnelling and leads to the appearance of a new type of geometric image contrast. In the framework of this project we study STM transport through condensed gas media from a fundamental point of view. At the same time we utilise the newly discovered effects in the development of a new STM imaging technique - the scanning tunnelling hydrogen microscopy (STHM).New J. Phys. 10, 053012 (2008)

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Transport

Single molecular STM transport in well controlled experimental geometries

Fundamental understanding of single molecule transport experiments requires close interaction with theory. In this project we aim for the highest possible degree of experimental control over STM-based single molecules transport junctions; this allows us to provide direct input for ab-initio transport calculations. One of the project goals is exploring the limits of the single-particle picture in realistic molecular transport junctions.

Nanotechnology 19, 065401 (2008)

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OFET

Fundamental interface properties in OFETs: bonding, structure and function of molecular adsorbate layers on solid surfaces

The functionality of organic field effect transistors resides in their interfaces, both organic metal (charge carrier injection) and organic insulator (charge transport). Highly ordered molecular adsorbate layers provide an excellent tool to study the relevant physical properties of these interfaces. Within the DFG priority program 1121 "Organic field effect transistors: structure and dynamics" (2001-2007) we have investigated fundamental interface properties of organic field effect transistors. The results are summarized and reviewed in phys. stat. sol. (a) 205, 511 (2008) (Feature Article and Review).

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