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.com
Volume 6
Research & Reviews: Journal of Material Sciences
Advanced Materials 2018
September 19-21, 2018
September 19-21, 2018 Tokyo, Japan
22
nd
International Conference on
Advanced Materials and Nanotechnology
Omer Meroz et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C4-023
Enhancing transport properties of Bi
2
Te
3
-xSex alloys via doping for thermoelectric power
generation applications
Omer Meroz and Yaniv Gelbstein
Ben-Gurion University of the Negev, Israel
W
hile trying to find new alternative energy resources, new technological developments must be made to bring the society
one step closer to a cleaner environment. The rising awareness of the global warming effect as well as the steady decline in
the quantity of current resources and subsequently the climb in their price drive the search for improving current energy usage
and finding new energy resources. Thermoelectric devices take thermal heat, either directly from solar energy or as a byproduct
of fuel burn and transform it to electricity. The performance of thermoelectric devices is assessed by the dimensionless figure
of merit ZT of the material, defined as ZT=α
2
σT/κ, where α, σ,κ and T are the Seebeck coefficient, the electrical and thermal
conductivities and the absolute temperature, respectively. The thermal conductivity is a combination of thermal conductivity
via electrons, Ke and via phonons, κl. The main difficulty in improvement of the efficiency of a thermoelectric device is due
to the complex relation between σ, α and κ. Improving the performance of thermoelectric materials is usually done either by
improving the power factor, α
2
σ or by applying phonon scattering methods in order to lower the thermal conductivity. Bismuth-
telluride-based alloys are of great importance not only as the best thermoelectric materials with the maximal ZT values close
to unity near room temperature but also due to the potential for further performance improvement. In this study Bi
2
Te
3-
x
Sex compositions were electronically optimized by various CHI
3
doping levels, preferred alignment of the crystallographic
orientation and lattice thermal conductivity minimization. The synthesis route included rocking furnace melting, energetic
ball milling and hot pressing under optimal conditions for enhancement of the thermoelectric figure of merit, ZT commonly
applied in low temperature power generation applications. The transport properties in perpendicular to the pressing direction
were examined.
Biography
Omer Meroz is student at Ben-Gurion University of the Negev, Israel. Her research experience includes various programs, contributions and participation in different
countries for diverse fields of study. She is a recipient of many awards and grants for his valuable contributions and discoveries in major area of research. Her
research interests lie in Major areas of Study. She is committed to highest standards of excellence and it proves through her work and experience.
omer.meroz@gmail.com