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May 16-17, 2019 | Prague, Czech Republic
2
nd
International Conference on
22
nd
International Conference on
Nanomaterials and Nanotechnology
Advanced Nanoscience and Nanotechnology
Joint Event
&
Journal of Materials Science and Nanotechnology | Volume 3
Mater Sci Nanotechnol, Volume 3
Bandgap tunability in one dimensional system
Rakesh Kumar, Payal Wadhwa, Shailesh Kumar, T J Dhilip Kumar
and
Alok Shukla
Indian Institute of Technology Ropar, India
F
or optoelectronic applications of low dimensional
materials, a direct bandgap is required; but for
optoelectronic applications of the same material in different
wavelength range, bandgap tunability is required. Even
though tunability of bandgap in direct bandgap materials
carries huge potential for optoelectronic applications like
LEDs and solar cells, an exhaustive formulation for bandgap
tuning is unavailable. In this article, we report broad
theoretical investigations using periodic potential profiles for
direct bandgap one-dimensional isomeric systems having the
same functional groups. We derived all possible correlations
between bandgaps of one-dimensional isomeric systems
using two parameters, width and depth of the deepest
potential well at global minimum. The derived correlations
are verified for known synthetic as well as natural polymers
(biological and organic) and also for other one-dimensional
direct bandgap systems. We have demonstrated bandgap
tuning simply by modifying the potential profile on changing
the position of the functional group in a periodic supercell.
This insight would greatly help experimentalists in designing
new isomeric systems of different bandgap values from a
direct bandgap polymer or a one-dimensional inorganic
system for its optoelectronic applications.
Speaker Biography
Rakesh Kumar is an assistant professor in the department of Physics
at IIT Ropar, India. In 2006, he received his PhD degree from Indian
Institute of Technology Bombay, where he worked on superconductivity
and magnetism. Thereafter, he joined Tata Institute of Fundamental
Research, Mumbai as a visiting fellow, where he continued his research
work on magnetic materials. In 2007, he moved to University of Peirre
and Marie Curie, Paris, France to work on graphene and other two-
dimensional layered materials like InSe, NbSe
2
, BSCCO superconductors
and Bismuth. He worked on fabrication as well as electrical
characterization of Field Effect Transistors (FETs). His current research
interests focused on theoretical and experimental investigations of low
dimensional materials and the involved Physics towards its electronic
applications.
e:
rakesh@iitrpr.ac.in