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Nanostructural Tailoring to Induce Flexibility in Thermoelectric Ca3Co4O9 Thin Films
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1785-0864
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 30, p. 25308-25316Article in journal (Refereed) Published
Abstract [en]

Because of their inherent rigidity and brittleness, inorganic materials have seen limited use in flexible thermoelectric applications. On the other hand, for high output power density and stability, the use of inorganic materials is required. Here, we demonstrate a concept of fully inorganic flexible thermoelectric thin films with Ca3Co4O9-on-mica. Ca3Co4O9 is promising not only because of its high Seebeck coefficient and good electrical conductivity but also because of the abundance, low cost, and nontoxicity of its constituent raw materials. We show a promising nanostructural tailoring approach to induce flexibility in inorganic thin-film materials, achieving flexibility in nanostructured Ca3Co4O9 thin films. The films were grown by thermally induced phase transformation from CaO-CoO thin films deposited by reactive rf-magnetron cosputtering from metallic targets of Ca and Co to the final phase of Ca3Co4O9 on a mica substrate. The pattern of nanostructural evolution during the solid-state phase transformation is determined by the surface energy and strain energy contributions, whereas different distributions of CaO and CoO phases in the as-deposited films promote different nanostructuring during the phase transformation. Another interesting fact is that the Ca3Co4O9 film is transferable onto an arbitrary flexible platform from the parent mica substrate by etch-free dry transfer. The highest thermoelectric power factor obtained is above 1 x 10(-4) W m(-1) K-2 in a wide temperature range, thus showing low-temperature applicability of this class of materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 30, p. 25308-25316
Keywords [en]
Ca3Co4O9; thermoelectrics; nanostructure; flexible film; transferable film
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-140051DOI: 10.1021/acsami.7b06301ISI: 000407089300027PubMedID: 28699345OAI: oai:DiVA.org:liu-140051DiVA, id: diva2:1136609
Note

Funding Agencies|European Research Council (ERC) under the European Community [335383]; Swedish Research Council (VR) [2012-4430]; Eurostars project T-to-Power [E!8892]; Swedish Foundation for Strategic Research (SSF) through the Future Research Leaders 5 program

Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-09-12

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