A self-forming nanocomposite concept for ZnO-based thermoelectrics
authors Zakharchuk, KV; Widenmeyer, M; Alikin, DO; Xie, WJ; Populoh, S; Mikhalev, SM; Tselev, A; Frade, JR; Weidenkaff, A; Kovalevsky, AV
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY A
keywords AL-DOPED ZNO; LATTICE THERMAL-CONDUCTIVITY; POWER-FACTOR; ZINC-OXIDE; ELECTRICAL-CONDUCTIVITY; MONOCLINIC ZIRCONIA; STABILIZED ZIRCONIA; DEFECT CHEMISTRY; TEMPERATURE; PERFORMANCE
abstract Zinc oxide (ZnO) has a very broad and versatile range of applications provided by its high abundance and optical and electrical properties, which can be further tuned by donor substitution. Al-doped ZnO is probably the most thoroughly investigated material with regard to thermoelectric properties. Fairly reasonable electrical properties of donor-doped zinc oxide are usually combined with 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 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 that 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 an implementation in other thermoelectric oxide systems. The results indicate that the proposed concept may also constitute a promising pathway to achieve stable electrical performance at high temperatures, which currently represents one of the major challenges towards achieving ZnO-based thermoelectrics.
publisher ROYAL SOC CHEMISTRY
issn 2050-7488
year published 2018
volume 6
issue 27
beginning page 13386
ending page 13396
digital object identifier (doi) 10.1039/c8ta01463a
web of science category Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000438548800049
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journal impact factor 9.931
5 year journal impact factor 9.531
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