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Journal of Biotechnology and Phytochemistry
Volume 1 Issue 3
Notes:
Chemistry World 2017
November 13-15, 2017 Athens, Greece
7
th
World Congress on
Chemistry
Udo Schwingenschlögl, J Biotech and Phyto 2017
Substrate effects on silicene and how to
exploit them
S
ilicene is the Si analogue of graphene with the
same honeycomb structure and linear dispersions
of the π and π* bands at the K point of the Brillouin
zone. It is predicted to realize a buckled structure,
due to sp2-sp3 hybridization, and is compatible with
the current Si-based nano-electronics. Silicene yet
has not been achieved by mechanical exfoliation
but can be deposited on metallic substrates such as
Ag(111), Ir(111), and ZrB
2
(0001). Regrettably, strong
interaction to these substrates destroys the Dirac
physics. For this reason, semiconducting substrates,
including Si(111) and SiC(0001), have been explored
theoretically to evaluate whether they lead to a Dirac
cone with reasonable band gap (which is essential for
applications). However, surface passivation is inevitable
for these and similar substrates, due to their dangling
bonds. Layered materials such as MgBr
2
(0001), MoX
2
,
and GaX
2
(X = S, Se, and Te), on the other hand, might
preserve the characteristic electronic states of silicene
and additionally simplify the preparation procedure as
passivation is not required. The predicted effects of
different substrates on silicene will be compared and
evaluated with respect to technological requirements.
Biography
Udo Schwingenschlögl is a Professor of Materials Science & Engineering at King
Abdullah University of Science andTechnology. His research interests in condensed
matter physics and first-principles materials modeling focus on two-dimensional
materials, interface and defect physics, correlated materials, thermoelectric
materials, metal-ion batteries, nanoparticles, and quantum transport.
udo.schwingenschlogl@kaust.edu.saUdo Schwingenschlogl
King Abdullah University of Science and Technology, Saudi Arabia