nanotehnoloogia, nanoteknologia, nanotechnologija, nanotehnologijas, nanoteknologija,
nanotechnologii, nanotecnologia, nanotehnologijo, nanoteknik
demonstrate a breakthrough in fabricating molecular
Scientists from Philips Research and the University of Groningen (the Netherlands)
have for the first time fabricated arrays of molecular diodes on standard substrates
with high yields. The molecular diodes are as thin as one molecule (1.5 nm),
and suitable for integration into standard plastic electronics circuits. Based
on construction principles known as molecular self-organization, molecular electronics
is a promising new approach for manufacturing electronics circuits in addition
to today's conventional semiconductor processing. Details of the technology
are presented in the 4 May 2006 issue of Nature .
Although still a relatively new field, molecular electronics can
be regarded as the next evolutionary stage for plastic electronics. Molecular
electronics holds the potential to fabricate elements for electronics circuits
with a functionality that is embedded in just a single layer of molecules.
Instead of using photolithography or printing techniques to etch or print nano-scale
circuit features, molecular electronics can be engineered to use organic molecules
that spontaneously form the correct structures via self-organization. Nature
provides the inspiration by being very efficient at using self-organized structures
for conducting charge – e.g. in the photosynthesis in plants and nerve systems
in mammals – and assembling such structures with precision beyond the capabilities
of any man-made machine or process.
“Molecular electronics will not compete with current silicon-based IC technologies
Dago de Leeuw, a Research Fellow within Philips Research and member of the joint
research team that made the breakthrough. “Molecular electronics could be an
interesting option for manufacturing plastic electronics. Plastic electronics
is very promising for the manufacture of electronics where low temperature
or low cost in-line processing techniques are required.”
While there have been many research activities in this field over the last
10 to 20 years, a reliable way of building molecular electronics had not been
found. Well-defined molecular-electronics-based diodes can
only be realized when the molecules are sandwiched between two metallic (e.g.
gold) electrodes. To this end functional molecules are used that (under the
proper conditions) spontaneously form a densely-packed monolayer on the bottom
electrode. Many approaches have attempted to simply deposit a metal electrode
directly on to this monolayer. However, this approach results in shorting,
caused by contacts forming between the electrodes, since the monolayer is only
1 to 2-nm thick.
technology developed by the scientists at the University of Groningen and Philips
Research uses monolayers that are confined to predefined holes in a polymer that
has been applied on top of the bottom electrode. The key to their success is
the deposition of an additional plastic electrode layer on to the monolayer prior
to the deposition of the metallic electrode. The plastic electrode protects the
monolayer and as such enables a non-detrimental deposition of the gold electrode.
“Based on a molecular self-assembly process we have developed a reliable way
to fabricate well-defined molecular diodes,” says Dr Bert de Boer, the Assistant
Professor within the Materials Science CentrePlus
at the University of Groningen that leads the joint research team. “It will
enable us, for the first time, to do reliable and reproducible measurements
on molecular junctions, which is essential for the exploration of the potential
applications of molecular electronics.”
The success of this research project is further proof of the leading position
that the University of Groningen and Philips Research have in plastic electronics
research. It also provides a strong foundation to develop new applications for
electronic elements in which the functionality has been confined to only one
Source: Philips Research
story has been adapted from a news release -
Diese Meldung basiert auf einer Pressemitteilung
tekst is gebaseerd op een nieuwsbericht -
the wave ?
some news ?
click on archive photo
how about joining us
contacting us ?