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Crystals 2018, 8(1), 14; doi:10.3390/cryst8010014

In2O3-Based Thermoelectric Materials: The State of the Art and the Role of Surface State in the Improvement of the Efficiency of Thermoelectric Conversion

1
School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
2
Department of Theoretical Physics, State University of Moldova, Chisinau 2009, Moldova
*
Authors to whom correspondence should be addressed.
Received: 9 October 2017 / Revised: 1 November 2017 / Accepted: 6 November 2017 / Published: 1 January 2018
(This article belongs to the Special Issue Semiconductor Nanomaterials Surfaces)

Abstract

In this paper, the thermoelectric properties of In2O3-based materials in comparison with other thermoelectric materials are considered. It is shown that nanostructured In2O3 Sn-based oxides are promising for thermoelectric applications at moderate temperatures. Due to the nanostructure, specific surface properties of In2O3 and filtering effects, it is possible to significantly reduce the thermal conductivity and achieve an efficiency of thermoelectric conversion inaccessible to bulk materials. It is also shown that a specific surface state at the intergrain boundary, optimal for maximizing the filtering effect, can be achieved through (1) the engineering of grain boundary parameters, (2) controlling the composition of the surrounding atmosphere, and (3) selecting the appropriate operating temperature. View Full-Text
Keywords: power factor; thermoconductivity; filtering effect; ZT; doping; conductivity; grain size; stability power factor; thermoconductivity; filtering effect; ZT; doping; conductivity; grain size; stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Korotcenkov, G.; Brinzari, V.; Ham, M.-H. In2O3-Based Thermoelectric Materials: The State of the Art and the Role of Surface State in the Improvement of the Efficiency of Thermoelectric Conversion. Crystals 2018, 8, 14.

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