Synergistic effects of zirconium- and aluminum co-doping on the thermoelectric performance of zinc oxide
authors Zakharchuk, KV; Tobaldi, DM; Xiao, XX; Xie, WJ; Mikhalev, SM; Martins, JF; Frade, JR; Weidenkaff, A; Kovalevsky, AV
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Zinc oxide; Thermoelectric performance; Electrical properties; Thermal conductivity; Zirconium doping
keywords AL-DOPED ZNO; ELECTRICAL-PROPERTIES; TRANSPORT-PROPERTIES; THIN-FILMS; POWER; MORPHOLOGY; CERAMICS; PROGRESS; LATTICE
abstract This work aims to explore zirconium as a possible dopant to promote thermoelectric performance in bulk ZnO-based materials, both within the single-doping concept and on simultaneous co-doping with aluminum. At 1100-1223 K mixed-doped samples demonstrated around similar to 2.3 times increase in ZT as compared to single-doped materials, reaching similar to 0.12. The simultaneous presence of aluminum and zirconium imposes a synergistic effect on electrical properties provided by their mutual effects on the solubility in ZnO crystal lattice, while also allowing a moderate decrease of the thermal conductivity due to phonon scattering effects. At 1173 K the power factor of mixed-doped Zn0.994Al0.003Zr0.003O was 2.2-2.5 times higher than for single-doped materials. Stability tests of the prepared materials under prospective operation conditions indicated that the gradual increase in both resistivity and Seebeck coefficient in mixed-doped compositions with time may partially compensate each other to maintain a relatively high power factor.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2019
volume 39
issue 4
beginning page 1222
ending page 1229
digital object identifier (doi) 10.1016/j.jeurceramsoc.2018.11.029
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000457819600066
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journal impact factor 3.794
5 year journal impact factor 3.536
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