Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films

Abstract We are reporting the effect of thickness on the Seebeck coefficient, electrical conductivity and power factor of Ca3Co4O9 thin films grown on single-crystal Sapphire (0001) substrate. Pulsed laser deposition (PLD) technique was employed to deposit Ca3Co4O9 films with precisely controlled th...

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Autores principales:	Yinong Yin, Ashutosh Tiwari
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9696d728dd8346c5a5de5b2c75595043
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spelling	oai:doaj.org-article:9696d728dd8346c5a5de5b2c755950432021-12-02T13:18:02ZUnderstanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films10.1038/s41598-021-85287-22045-2322https://doaj.org/article/9696d728dd8346c5a5de5b2c755950432021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85287-2https://doaj.org/toc/2045-2322Abstract We are reporting the effect of thickness on the Seebeck coefficient, electrical conductivity and power factor of Ca3Co4O9 thin films grown on single-crystal Sapphire (0001) substrate. Pulsed laser deposition (PLD) technique was employed to deposit Ca3Co4O9 films with precisely controlled thickness values ranging from 15 to 75 nm. Structural characterization performed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed that the growth of Ca3Co4O9 on Sapphire (0001) follows the island growth-mode. It was observed that in-plane grain sizes decrease from 126 to 31 nm as the thickness of the films decreases from 75 to 15 nm. The thermoelectric power measurements showed an overall increase in the value of the Seebeck coefficient as the films’ thickness decreased. The above increase in the Seebeck coefficient was accompanied with a simultaneous decrease in the electrical conductivity of the thinner films due to enhanced scattering of the charge carriers at the grain boundaries. Because of the competing mechanisms of the thickness dependence of Seebeck coefficient and electrical conductivity, the power factor of the films showed a non-monotonous functional dependence on thickness. The films with the intermediate thickness (60 nm) showed the highest power factor (~ 0.27 mW/m-K2 at 720 K).Yinong YinAshutosh TiwariNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yinong Yin Ashutosh Tiwari Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
description	Abstract We are reporting the effect of thickness on the Seebeck coefficient, electrical conductivity and power factor of Ca3Co4O9 thin films grown on single-crystal Sapphire (0001) substrate. Pulsed laser deposition (PLD) technique was employed to deposit Ca3Co4O9 films with precisely controlled thickness values ranging from 15 to 75 nm. Structural characterization performed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed that the growth of Ca3Co4O9 on Sapphire (0001) follows the island growth-mode. It was observed that in-plane grain sizes decrease from 126 to 31 nm as the thickness of the films decreases from 75 to 15 nm. The thermoelectric power measurements showed an overall increase in the value of the Seebeck coefficient as the films’ thickness decreased. The above increase in the Seebeck coefficient was accompanied with a simultaneous decrease in the electrical conductivity of the thinner films due to enhanced scattering of the charge carriers at the grain boundaries. Because of the competing mechanisms of the thickness dependence of Seebeck coefficient and electrical conductivity, the power factor of the films showed a non-monotonous functional dependence on thickness. The films with the intermediate thickness (60 nm) showed the highest power factor (~ 0.27 mW/m-K2 at 720 K).
format	article
author	Yinong Yin Ashutosh Tiwari
author_facet	Yinong Yin Ashutosh Tiwari
author_sort	Yinong Yin
title	Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
title_short	Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
title_full	Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
title_fullStr	Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
title_full_unstemmed	Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films
title_sort	understanding the effect of thickness on the thermoelectric properties of ca3co4o9 thin films
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9696d728dd8346c5a5de5b2c75595043
work_keys_str_mv	AT yinongyin understandingtheeffectofthicknessonthethermoelectricpropertiesofca3co4o9thinfilms AT ashutoshtiwari understandingtheeffectofthicknessonthethermoelectricpropertiesofca3co4o9thinfilms
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Understanding the effect of thickness on the thermoelectric properties of Ca3Co4O9 thin films

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