Oriented thin films of Na0.6CoO2 and Ca3Co4O9 deposited by spin-coating method on polycrystalline substrate

Buršík, J.; Soroka, Miroslav; Knı́žek, K.; Hirschner, J.; Levinský, Petr; Hejtmánek, J.

doi:10.1016/j.tsf.2016.02.056

Cited by 5 publications

(2 citation statements)

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“…Synthesis of Na x CoO 2 thin films was carried out primarily using pulsed laser deposition, but other methods such as topotactic exchange, chemical solution deposition. [132][133][134][135][136][137][138][139] Several attempts resulted in epitaxial growth of Na x CoO 2 , on c-plane sapphire, SrTiO 3 , SrLaGaO 4 etc. 132,133,137,140 As sodium in these compounds is a reactive species, these films often suffered from poor stability.…”

Section: B Cobaltatesmentioning

confidence: 99%

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Ravichandran

2016

J. Mater. Res.

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Over the years, the search for high performance thermoelectric materials has been dictated by the "phonon glass and electron crystal (PGEC)" paradigm, which suggests that low band gap semiconductors with high atomic number elements and high carrier mobility are the ideal materials to achieve high thermoelectric figure of merit. Complex oxides provide alternative mechanisms such as large density of states and strong electron correlation for high thermoelectric efficiency, albeit having low carrier mobility. Due to vast structural and chemical flexibility, they provide a fertile playground to design high efficiency thermoelectric materials. Further, developments in oxide thin film growth methods have enabled synthesis of high quality, atomically precise low dimensional structures such as heterostructures and superlattices. These materials and structures act as excellent model systems to explore nanoscale thermal and thermoelectric transport, which will not only expand the frontier of our knowledge, but also continue to enable cutting edge applications.

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Section: B Cobaltatesmentioning

confidence: 99%

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Ravichandran

2016

J. Mater. Res.

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“…To compensate the sodium losses that can occur during the final annealing at 800 °C, the film was encapsulated in Na 2 CO 3 powder, slightly pressed and heated at 625 °C for 16 h [15]. More details of precursor solution synthesis and film deposition procedure are reported in our previous papers [16,17].…”

Section: Methodsmentioning

confidence: 99%

Charge transport in thin layer Na_xCoO₂(x∼ 0.63) studied by terahertz spectroscopy

Němec

Knı́žek

Jirák

et al. 2016

J. Phys.: Condens. Matter

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Charge transport in Na0.63CoO2 thin film deposited by a spin-coating method was investigated experimentally by time-domain terahertz spectroscopy and theoretically using Monte Carlo calculations of charge response in nano-structured materials. The dominating type of transport mechanism over the entire investigated range of temperatures (20-300 K) is a metallic-like conductivity of charges partly confined in constituting nano-sized grains. Due to the granular character of our thin film, the scattering time at low temperatures is limited by scattering on grain boundaries and the conductivity is strongly suppressed due to capture of a major fraction of charge carriers in deep traps. Nevertheless, our experimental setup and the applied model allowed us to distinguish the parameters related to the grain interior from those influenced by grain boundaries, and to conclude that the metallic type of conductivity is the intrinsic property relevant to single crystal materials.

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

Pérez-Rivero

Cabero

Varela

et al. 2017

Journal of Alloys and Compounds

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Oriented thin films of Na0.6CoO2 and Ca3Co4O9 deposited by spin-coating method on polycrystalline substrate

Cited by 5 publications

References 40 publications

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Charge transport in thin layer Na_xCoO₂(x∼ 0.63) studied by terahertz spectroscopy

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

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Oriented thin films of Na0.6CoO2 and Ca3Co4O9 deposited by spin-coating method on polycrystalline substrate

Cited by 5 publications

References 40 publications

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Thermoelectric and thermal transport properties of complex oxide thin films, heterostructures and superlattices

Charge transport in thin layer NaxCoO2(x∼ 0.63) studied by terahertz spectroscopy

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

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Charge transport in thin layer Na_xCoO₂(x∼ 0.63) studied by terahertz spectroscopy