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University of Southampton (ECS) - Single-electron transistors
New high performance, low power sensor at nanoscale
ECS engineers are developing the world's smallest, high-performance and
low-power sensor in silicon which will have applications in biosensing
and environmental monitoring.
Professor Hiroshi Mizuta and his team at ECS are part of the three year
European FP7-funded NEMSIC
(Nano-electro-mechanical-system-integrated-circuits) project which will
make these devices possible.
As well as being the smallest sensor on the market to date, it will
have extreme sensitivity and very low power consumption. It will
achieve this by co-integrating single-electron transistors (SETs) and
nano-electro-mechanical systems (NEMS) on a common silicon technology
platform.
‘Power consumption is a big issue at the moment as devices use
current whether they are switched off and on,' said Professor Mizuta.
‘The single-electron transistor combined with the NEM device
technology reduces power consumption at both ON and OFF states of the
sensor. Stand-by power is reduced to zero by having a complete sleep
with the NEM switch when it is off.'
Professor Mizuta and his team will develop the single-electron
transistor with a unique suspended silicon nanobridge which will work
as an extremely sensitive detector for biological and chemical
molecules.
‘This is the first time that anyone has combined these two
nanotechnologies to develop a smart sensor,' said Professor Mizuta.
‘The traditional CMOS (Complementary metal-oxide-semiconductor)
approach has many limitations so we needed to find a new approach.'
The sensing devices will need to be made to the nanoscale, which will
be made possible by the new electron beam lithography machine which
will be available in the new ECS Mountbatten building when it opens in
a few months.
‘This sensor will be the smallest and use less power than any
other on the market,' said Professor Mizuta. ‘The fact that it
will be at the nanoscale means that it will be able to detect either
single-charge transfer and/or change in masses caused by a small amount
of chemical and biological molecules electrically'.
NEMSIC is headed by Professor Adrian Ionescu of Ecole Polytechnique
Fédérale de Lausanne and other partners are: Delft
University of Technology, Stitching IMEC Nederland, Commissariat
à l'Energie Atomique – Laboratoire d'Electronique de la
Technologie de l'Information, SCIPROM Sarl, Interuniversity
Micro-electronics Center, Honeywell Romania SRL – Sensors
Laboratory Bucharest, Université de Genève.
Source: University of Southampton School of Electronics and Computer Science
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