Biography
Prof. László P. Biró is the head of the Nanostructures Department (http://www.nanotechnology.hu/) in the Research Institute for Technical Physics and Materials Science of the Hungarian Academy of Sciences. He received his Ph.D. degree in 1997 from the Technical University of Budapest after contributing to STM and AFM investigation of surface nanostructures produced by ion irradiation. In 2005, he became the Doctor of the Hungarian Academy of Sciences for his work on carbon nanotube-type nanostructures. Currently, he is interested in the atomic scale, cystallographically controlled nanolithography of graphene and photonic nanoarchitectures of biological origin and bioinspiration. The group of Prof. Biró developed the first two nanolithographic methods, which allow the production of graphene nanoribbons with well defined structure and gap values making possible the room temperature operation of graphene based nanoelectronics.
Abstract
Graphene: the Route from Touch Screens to Digital Nanoelectronics
The discovery of graphene in 2004 – a potential winner in the
competition for the title of the wonder material of the 21st century –
was rewarded in 2010 by the Nobel prize for Physics. This one single
atom thick sheet of graphite, built from carbon atoms arranged in a
honeycomb lattice, is stronger than diamond, yet flexible, conducts
electricity and heat better than copper, furthermore it is transparent.
Its electronic properties surpass by orders of magnitude those of
silicon, raising the possibility of high-efficiency, low-power,
carbon-based nanoelectronics. With the prediction from the
International Technology Roadmap for Semiconductors that the
development of silicon based CMOS – the heart of our computers and
mobile phones – comes to the end by 2022, mainly due to physical laws
of Nature, it’s extraordinary properties make graphene one of the most
attractive potential replacements of silicon. Scientists attribute
graphene’s surprising electronic properties (as well as a number of
even stranger phenomena) to the presence of charge carriers that behave
as if they were massless, “relativistic” quasiparticles called Dirac
fermions. Harnessing these quasiparticles in real-world carbon-based
devices, however, requires new, nanolithographic procedures – allowing
for the creation of graphene nanostructures with atomic precision – and
a deeper knowledge of the behavior of the quasiparticles under
less-than-ideal circumstances, such as around defects, at edges, at
grain boundaries, etc. Fortunately there is another market sector, that
of flexible touch screens, with less demanding requirements under the
aspect of material properties, but significantly more demanding under
the aspect of the size of available graphene sheets. Due to the fact
that the indium used in present day flat screens is close to depletion,
large size graphene sheets produced by chemical vapor deposition on
copper are ready to take over the role of ITO. As a supplementary
benefit, this will make flat screens flexible. Very likely this segment
of the to be born “graphene industry” will be able to sustain the pace
of material and technological developments for a long enough time,
required to make feasible the implementation of graphene based
nanoelectronics.