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Title: A self-forming nanocomposite concept for ZnO-based thermoelectrics
Author: Zakharchuk, Kiryl V.
Widenmeyer, Marc
Alikin, Denis O.
Xie, Wenjie
Populoh, Sascha
Mikhalev, Sergey M.
Tselev, Alexander
Frade, Jorge R.
Weidenkaff, Anke
Kavaleuski, Andrei V.
Keywords: Zinc oxide
Thermoelectric performance
Electrical properties
Thermal conductivity
Issue Date: 21-Jul-2018
Publisher: Royal Society of Chemistry
Abstract: Zinc oxide (ZnO) has a very broad and versatile range of applications provided by high abundance, optical and electrical properties, which can be further tuned by donor substitution. Al-doped ZnO is probably the most thoroughly investigated material regarding thermoelectric properties. Fairly reasonable electrical properties of donor-doped zinc oxide are usually combined with a high thermal conductivity limiting potential applications. Here we report a new self-forming nanocomposite concept for ZnO-based thermoelectrics, where a controllable interplay between the presence and exsolution of the nanophases, and modification of the host matrix suppresses the thermal transport while imparting enhanced electrical performance. The thermoelectric performance of the best-obtained composite, described by the dimensionless figure-of-merit ZT, at 920-1200 K is almost twice of the pure matrix composition and reaches up to 0.11. The proposed approach invokes controlled interactions between composite components as a novel tool for decoupling the electrical and thermal transport parameters and shows clear prospects for implementation in other thermoelectric oxide systems. The results indicate that the proposed concept may also constitute a promising pathway to achieve a stable electrical performance at high temperatures, which currently represents one of the major challenges towards performing ZnO-based thermoelectrics.
Peer review: yes
DOI: 10.1039/C8TA01463A
ISSN: 2050-7488
Publisher Version:!divAbstract
Appears in Collections:CICECO - Artigos

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