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Topic Name: Two-dimensional conductivity at the surface of organic single crystals
Category: Electronics
Research persons: R.W.I. de Boer (PhD student), A. Stassen & N. Iosad (Postdocs), A. Morpurgo (PI)
Location: Delft, Germany
Details
Molecular systems, or systems based on small organic molecules, possess
interesting and useful electronic properties. The rapidly developing area of
organic -or plastic- electronics is based on these materials. The investigations
of molecular systems that have been performed in the past have been strongly
influenced, in most cases, by the presence of defects or imperfections in the
materials used experimentally. This has prevented the systematic investigation
of the intrinsic electronic properties of molecular systems.
Our work aims at controlling and understanding the electronic properties
of molecular systems. Control can be gained in different ways. The two
different ideas on which our research is based are:
1) control the material at the molecular level by acting on the constituent
molecules (i.e. the molecular building blocks);
2) control of the charge density in the material -or at its surface- by means of
chemical and electrostatic doping.
In this research area, the ability to push the frontier of research beyond
its present limits (i.e., truly gaining control over the electronic properties
of molecular systems) requires an unprecedented level of control also at the
molecular material level. Achieving such a level of material control is an
integral part of our research. We do this by working with high-quality
single crystals of organic molecules or under extreme UHV conditions (p<10-11
mbar), which allows the minimization of structural and chemical defects in the
materials.
The Holy Grail of this work is to fabricate and investigate a high-mobility,
organic-based 2D conductor working at cryogenic temperature, in a field effect
transistor (FET) configuration. As the electronic transport properties of
organic materials are very different from those of more conventional inorganic
conductors, such a system would give experimental access to new, unexplored
physical phenomena. During the past year, there has been considerable progress
in the realization of single crystal FETs and our group has given important
contributions to this work.
| Tags: |
Two-dimensional conductivity - organic single crystals - 2D conductor - Organic Crystals - |
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