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Nanoporous Ca3Co4O9 Thin Films for Transferable Thermoelectrics
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material. Linköpings universitet, Tekniska fakulteten.
Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
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2018 (engelsk)Inngår i: ACS applied energy materials, ISSN 2574-0962, Vol. 1, nr 5, s. 2261-2268Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The development of high-performance and transferable thin-film thermoelectric materials is important for low-power applications, e.g., to power wearable electronics, and for on-chip cooling. Nanoporous films offer an opportunity to improve thermoelectric performance by selectively scattering phonons without affecting electronic transport. Here, we report the growth of nanoporous Ca3Co4O9 thin films by a sequential sputtering-annealing method. Ca3Co4O9 is promising for its high Seebeck coefficient and good electrical conductivity and important for its nontoxicity, low cost, and abundance of its constituent raw materials. To grow nanoporous films, multilayered CaO/CoO films were deposited on sapphire and mica substrates by rf-magnetron reactive sputtering from elemental Ca and Co targets, followed by annealing at 700 C to form the final phase of Ca3Co4O9. This phase transformation is accompanied by a volume contraction causing formation of nanopores in the film. The thermoelectric propoperties of the nanoporous Ca3Co4O9 films can be altered by controlling the porosity. The lowest electrical resistivity is ~7 mO cm, yielding a power factor of 2.32 × 10-4 Wm-1K-2 near room temperature. Furthermore, the films are transferable from the primary mica substrates to other arbitrary polymer platforms by simple dry transfer, which opens an opportunity of low-temperature use these materials.

sted, utgiver, år, opplag, sider
American Chemical Society (ACS), 2018. Vol. 1, nr 5, s. 2261-2268
Emneord [en]
Ca3Co4O9; nanoporous; thermoelectrics; thin film; transferable
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Identifikatorer
URN: urn:nbn:se:liu:diva-155845DOI: 10.1021/acsaem.8b00333ISI: 000458705500058PubMedID: 29905306OAI: oai:DiVA.org:liu-155845DiVA, id: diva2:1300702
Tilgjengelig fra: 2019-03-29 Laget: 2019-03-29 Sist oppdatert: 2019-04-04bibliografisk kontrollert

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