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Mechanism of Formation of the Thermoelectric Layered Cobaltate Ca3Co4O9 by Annealing of CaO-CoO Thin Films
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Risö-DTU, Denmark.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Advanced Electronic Materials, ISSN 2199-160X, Vol. 1, nr 3, artikkel-id 1400022Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The layered cobaltate Ca3Co4O9 is of interest for energy-harvesting and heat-conversion applications because of its good thermoelectric properties and the fact that the raw materials Ca and Co are nontoxic, abundantly available, and inexpensive. While single-crystalline Ca3Co4O9 exhibits high Seebeck coefficient and low resistivity, its widespread use is hampered by the fact that single crystals are too small and expensive. A promising alternative approach is the growth of highly textured and/or epitaxial Ca3Co4O9 thin films with correspondingly anisotropic properties. Here, we present a two-step sputtering/annealing method for the formation of highly textured virtually phase-pure Ca3Co4O9 thin films by reactive cosputtering from Ca and Co targets followed by an annealing process at 730 °C under O2-gas flow. The thermally induced phase transformation mechanism is investigated by in situ time-resolved annealing experiments using synchrotron-based 2D X-ray diffraction (XRD) as well as ex situ annealing experiments and standard lab-based XRD. By tuning the proportion of initial CaO and CoO phases during film deposition, the method enables synthesis of Ca3Co4O9 thin films as well as CaxCoO2. With this method, we demonstrate production of epitaxial Ca3Co4O9 thin films with in-plane electrical resistivity of 6.44 mΩ cm and a Seebeck coefficient of 118 μV K−1 at 300 K.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2015. Vol. 1, nr 3, artikkel-id 1400022
Emneord [en]
Thermoelectrics, Ca3Co4O9, thin film, sputtering, phase transformation
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-117610DOI: 10.1002/aelm.201400022ISI: 000357653900004OAI: oai:DiVA.org:liu-117610DiVA, id: diva2:810044
Forskningsfinansiär
EU, European Research Council, 335383Swedish Research Council, 2012-4430Swedish Research Council, 2011-6505Swedish Foundation for Strategic Research , Future Research Leaders 5Tilgjengelig fra: 2015-05-06 Laget: 2015-05-06 Sist oppdatert: 2016-02-16bibliografisk kontrollert

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