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Dear All,

SOLID STATE & STRUCTURAL CHEMISTRY UNIT

INDIAN INSTITUTE OF SCIENCE

BANGALORE – 560 012

SEMINAR

Speaker: Ms. Smruti Rekha Mahapatra

Title

Thermoelectrics for Energy Harvesting

Date & Time: Thursday 28th February, 2019 at 4.00 PM

Venue: SSCU AUDITORIUM

Abstract:

Currently, more than 60% of the energy produced from fossil fuels is lost as waste heat. Thermoelectric energy conversion, which is the process of converting
thermal energy to electricity, without hazardous emissions, is attracting attention as a potential energy harvesting technology. The energy conversion efficiency
of thermoelectric materials is determined by the dimensionless figure of merit (ZT), which is defined as ZT = T, where ‘S’ is the Seebeck coefficient, ‘σ’ is the
electrical conductivity, ‘κ’ is the thermal conductivity and ‘T’ is the absolute temperature. Maximizing ZT is the primary objective of research in
thermoelectrics. However, the parameters, S, σ and κ cannot, in general, be varied independently to maximize ZT.

In this talk, I will introduce elements of thermoelectricity and discuss on potential approaches to enhance ZT. I will discuss on nanoscience based approaches to
increase the Seebeck Coefficient, S, while not significantly decreasing electrical conductivity, σ. I will also present on the possible approaches to decrease
lattice thermal conductivity while not significantly decreasing electrical conductivity. Finally, I will also touch upon quantum mechanics based approaches
utilizing band engineering and nano-structuring that could lead to enhanced thermoelectric energy conversion efficiency.

References:

1. L. D. Hicks and M. S. Dresselhaus, Phys. Rev. B 47, 12727 (1993
2. A. Shakouri, Annu. Rev. Mater. Res. 2011. 41:399–431
3. Vineis et al., Adv. Mater. 22 3970, 2012
4. J. Heremans et.al., science 321:554 (2008) (Band structure engineering)
5. M. S. Dresselhaus et al., Adv. Mater. 19, 1043–1053 (2007)

ALL ARE CORDIALLY INVITED TO ATTEND

Convener

Bitnami