Thermoelectric Materials and Devices - Hierarchical Nanostructures for Energy Devices - page 137

synthesis methods, device theory and possible applications. Thermoelectric
performance has been improved by using nanostructures since the 2000s.
Nanostructures alleviated the interdependency between three thermo-
electric properties, i.e. the Seebeck coecient, electrical conductivity and
thermal conductivity, and they were particularly effective in reducing ther-
mal conductivity. We also presented ways to enhance the power factor, such
as the quantum confinement effect, electron filtering, band convergence
and resonant levels. It is expected that combining these two technologies
could lead to high performance thermoelectric materials. To realize these
transport theories, various synthesis procedures have been scrutinized.
Some of these efforts have been introduced in this chapter with an em-
phasis on the thermoelectric figure of merit dependency over crystal
structures. Finally, device theory and fabrication were presented. We hope
that this topic chapter can significantly help scholars working in the field of
thermoelectrics.

d n 3 r 4 n g | 7

Acknowledgements
This work was supported by the Mid-career Researcher Program (No. 2011-
0028729) through a National Research Foundation of Korea (NRF) grant
funded by the Ministry of Education, Science and Technology (MEST) and
Low Observable Technology Research Center Program of Defense Acqui-
sition Program Administration and Agency for Defense Development.

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