Insights into the classification of nanoinclusions of composites for thermoelectric applications

Theja, V. C. S., Karthikeyan, V. , Assi, D. S. and Roy, V. A. L. (2022) Insights into the classification of nanoinclusions of composites for thermoelectric applications. ACS Applied Electronic Materials, 4(10), pp. 4781-4796. (doi: 10.1021/acsaelm.2c00617)

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Abstract

Thermoelectric composites are known for their enhanced power conversion performance via interfacial engineering and intensified mechanical, structural, and thermal properties. However, the selection of these nanoinclusions, for example, their type, size effect, volume fraction, distribution uniformity, coherency with host, carrier dynamics, and physical stability, plays a crucial role in modifying the host material thermoelectric properties. In this Review, we classify the nanoinclusions into five types: carbon allotropes, secondary thermoelectric phases, metallic materials, insulating oxides, and others. On the basis of the classification, we discuss the mechanisms involved in improving the ZT of nanocomposites involving reduction of thermal conductivity (κ) by phonon scattering, improving the Seebeck coefficient (α) via energy filtering effect and the electrical conductivity (σ) by carrier injection or carrier channeling. Comprehensibly, we validate that adding nanoinclusions with high electrical and low thermal conductivity as compared to the matrix material is the best way to optimize the interlocked thermoelectric parameters. Thus, collective doping and nanoinclusions in thermoelectric materials is the best possible solution to achieve a higher power conversion efficiency equivalent to other renewable energy technologies.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Karthikeyan, Dr Vaithinathan and Vellaisamy, Professor Roy and Assi, Dani
Authors: Theja, V. C. S., Karthikeyan, V., Assi, D. S., and Roy, V. A. L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Applied Electronic Materials
Publisher:American Chemical Society
ISSN:2637-6113
ISSN (Online):2637-6113
Published Online:26 September 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in ACS Applied Electronic Materials 4(10): 4781-4796
Publisher Policy:Reproduced under a Creative Commons License

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