Size effects on thermoelectric behavior of ultrathin NaxCoO2 films

Peter Brinks; Augustinus J.H.M. Rijnders; Mark Huijben

doi:10.1063/1.4901447

Size effects on thermoelectric behavior of ultrathin NaxCoO2 films

Peter Brinks, Augustinus J.H.M. Rijnders, Mark Huijben

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Abstract

Size effects in thermoelectric Na x CoO2 thin films are studied, focusing on the electrical resisitivity and Seebeck coefficient. For very thin films below 10 nm, we have observed an increase in resistivity, which is in agreement with theoretical models. In contrast to a predicted simultaneous suppression of the Seebeck coefficient for ultrathin films, we observe a constant Seebeck coefficient as a function of layer thickness due to changes in the structural properties as well as the presence of strong electron correlations. This preserved high Seebeck coefficient opens up new directions for Na xCoO2 ultrathin films as basic building blocks in thermoelectric superlattices with enhanced phonon scattering.

Original language	Undefined
Article number	193902
Pages (from-to)	-
Number of pages	4
Journal	Applied physics letters
Volume	105
Issue number	193
DOIs	https://doi.org/10.1063/1.4901447
Publication status	Published - 2014

Keywords

METIS-306730
IR-94979

Access to Document

10.1063/1.4901447

Cite this

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abstract = "Size effects in thermoelectric Na x CoO2 thin films are studied, focusing on the electrical resisitivity and Seebeck coefficient. For very thin films below 10 nm, we have observed an increase in resistivity, which is in agreement with theoretical models. In contrast to a predicted simultaneous suppression of the Seebeck coefficient for ultrathin films, we observe a constant Seebeck coefficient as a function of layer thickness due to changes in the structural properties as well as the presence of strong electron correlations. This preserved high Seebeck coefficient opens up new directions for Na xCoO2 ultrathin films as basic building blocks in thermoelectric superlattices with enhanced phonon scattering.",

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AU - Rijnders, Augustinus J.H.M.

AU - Huijben, Mark

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N2 - Size effects in thermoelectric Na x CoO2 thin films are studied, focusing on the electrical resisitivity and Seebeck coefficient. For very thin films below 10 nm, we have observed an increase in resistivity, which is in agreement with theoretical models. In contrast to a predicted simultaneous suppression of the Seebeck coefficient for ultrathin films, we observe a constant Seebeck coefficient as a function of layer thickness due to changes in the structural properties as well as the presence of strong electron correlations. This preserved high Seebeck coefficient opens up new directions for Na xCoO2 ultrathin films as basic building blocks in thermoelectric superlattices with enhanced phonon scattering.

AB - Size effects in thermoelectric Na x CoO2 thin films are studied, focusing on the electrical resisitivity and Seebeck coefficient. For very thin films below 10 nm, we have observed an increase in resistivity, which is in agreement with theoretical models. In contrast to a predicted simultaneous suppression of the Seebeck coefficient for ultrathin films, we observe a constant Seebeck coefficient as a function of layer thickness due to changes in the structural properties as well as the presence of strong electron correlations. This preserved high Seebeck coefficient opens up new directions for Na xCoO2 ultrathin films as basic building blocks in thermoelectric superlattices with enhanced phonon scattering.

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KW - IR-94979

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