STM-based quantum transport through molecular wires
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Beschreibung
The further miniaturization of electronic devices is a strong driving force in science.
In the last few decades, devices based on organic materials have been studied. One
goal is to create applications performed nowadays by silicon-based CMOS technology
with organic materials. In these studies the interest is placed upon diverse properties
of the organic molecules, such as their electronic, geometric, thermal, optical, and
electroluminescence characteristics. One of the main problems of these studies is the
lack of geometrical control of the systems during the measurements. As the physical
properties critically depend on the exact geometry, contradictory results are found in
literature.
To overcome this lack of control, this work introduces a new method which enables
transport studies on single molecules with highly controlled junction geometries. The
concept of this method, which is based on scanning probe techniques, will be presented
as well as its realization. The method will be applied to molecule-metal junctions with
molecules of dierent lengths which are contacted by dierent metal electrodes. It will
be shown that highly reproducible experiments can be performed. Furthermore, the
physical interpretation of the measurements will be discussed. It will be demonstrated
that the profound knowledge of the geometry in these junctions helps to achieve a better
understanding of the transport properties.
Autor*in
Norman Fournier