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Thermoelectric functionality of Ca3Co4O9 epitaxial thin films on yttria-stabilized zirconia crystalline substrate

AuthorsPérez-Rivero, Armando ; Cabero, M.; Varela, M.; Ramírez-Jiménez, Rafael; Mompean, F. J. ; Santamaría, J.; Martínez, J. L. ; Prieto, C.
KeywordsOxide thin films
Thermoelectric materials
Issue Date5-Jul-2017
CitationJournal of Alloys and Compounds 710: 151-158 (2017)
AbstractLayered cobaltite CaCoO is one of the most interesting materials for energy conversion due to its excellent thermoelectric properties and stability at high temperatures. However, the best performance of this material is achieved for single crystals and epitaxial films. Within this framework, an important role is played by the substrate, which should promote epitaxial growth and that should have suitable thermal properties for its integration in devices. In this work, we report on the preparation of epitaxial thin films of CaCoO by sputtering using low cost ceramic target on cubic yttria-stabilized zirconia (YSZ(100)) that is typically the standard for low thermal conductivity material and on hexagonal sapphire (AlO(0001)). The quality of the epitaxial films and its microstructure has been studied to explain the thermoelectric properties obtained for both substrates. YSZ(100) substrate provides CaCoO films with enhanced Seebeck coefficient and AlO(0001) allows improved conductive CaCoO films that finally, at 200 °C, results in a substrate-modified Z′T figure of merit one order of magnitude higher for CaCoO on YSZ(100) than on AlO(0001) substrate.
Publisher version (URL)https://doi.org/10.1016/j.jallcom.2017.03.191
Identifiersdoi: 10.1016/j.jallcom.2017.03.191
issn: 0925-8388
Appears in Collections:(ICMM) Artículos
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