High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material

Pure GeTe shows inferior thermoelectric performance due to the large carrier concentration caused by the intrinsic high concentration of Ge vacancies. In this study, we report improved thermoelectric performance of Bi and In co-doped GeTe based thermoelectric material where a figure of merit, ZT ∼ 1...

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Autores principales:	Hyerin Jeong, Samuel Kimani Kihoi, Hyunji Kim, Ho Seong Lee
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Thermoelectric Thermal conductivity GeTe Seebeck coefficient Microstructure TEM Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/7f606a2347614399aacd3753b19367d5
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spelling	oai:doaj.org-article:7f606a2347614399aacd3753b19367d52021-12-04T04:34:27ZHigh seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material2238-785410.1016/j.jmrt.2021.11.065https://doaj.org/article/7f606a2347614399aacd3753b19367d52021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013442https://doaj.org/toc/2238-7854Pure GeTe shows inferior thermoelectric performance due to the large carrier concentration caused by the intrinsic high concentration of Ge vacancies. In this study, we report improved thermoelectric performance of Bi and In co-doped GeTe based thermoelectric material where a figure of merit, ZT ∼ 1.7 at 623 K was realized through synergetic effect of tuning the carrier concentration, resonant states, and suppression of thermal conduction. In doping induces resonant states in the density of states near the Fermi energy level. Bi sharply reduces lattice thermal conductivity by formation of extensive solid solution point defects. Moreover, Bi and In co-doping decreases the phase transformation temperature to widen the better thermoelectric performance of cubic GeTe at low temperatures. In addition, microstructural characterization showed herringbone structures, high-density of domain boundaries, and twinning. These, together with the point defects, lead to a significantly reduced thermal conductivity.Hyerin JeongSamuel Kimani KihoiHyunji KimHo Seong LeeElsevierarticleThermoelectricThermal conductivityGeTeSeebeck coefficientMicrostructureTEMMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6312-6318 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermoelectric Thermal conductivity GeTe Seebeck coefficient Microstructure TEM Mining engineering. Metallurgy TN1-997
spellingShingle	Thermoelectric Thermal conductivity GeTe Seebeck coefficient Microstructure TEM Mining engineering. Metallurgy TN1-997 Hyerin Jeong Samuel Kimani Kihoi Hyunji Kim Ho Seong Lee High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
description	Pure GeTe shows inferior thermoelectric performance due to the large carrier concentration caused by the intrinsic high concentration of Ge vacancies. In this study, we report improved thermoelectric performance of Bi and In co-doped GeTe based thermoelectric material where a figure of merit, ZT ∼ 1.7 at 623 K was realized through synergetic effect of tuning the carrier concentration, resonant states, and suppression of thermal conduction. In doping induces resonant states in the density of states near the Fermi energy level. Bi sharply reduces lattice thermal conductivity by formation of extensive solid solution point defects. Moreover, Bi and In co-doping decreases the phase transformation temperature to widen the better thermoelectric performance of cubic GeTe at low temperatures. In addition, microstructural characterization showed herringbone structures, high-density of domain boundaries, and twinning. These, together with the point defects, lead to a significantly reduced thermal conductivity.
format	article
author	Hyerin Jeong Samuel Kimani Kihoi Hyunji Kim Ho Seong Lee
author_facet	Hyerin Jeong Samuel Kimani Kihoi Hyunji Kim Ho Seong Lee
author_sort	Hyerin Jeong
title	High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
title_short	High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
title_full	High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
title_fullStr	High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
title_full_unstemmed	High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material
title_sort	high seebeck coefficient and low thermal conductivity in bi and in co-doped gete thermoelectric material
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/7f606a2347614399aacd3753b19367d5
work_keys_str_mv	AT hyerinjeong highseebeckcoefficientandlowthermalconductivityinbiandincodopedgetethermoelectricmaterial AT samuelkimanikihoi highseebeckcoefficientandlowthermalconductivityinbiandincodopedgetethermoelectricmaterial AT hyunjikim highseebeckcoefficientandlowthermalconductivityinbiandincodopedgetethermoelectricmaterial AT hoseonglee highseebeckcoefficientandlowthermalconductivityinbiandincodopedgetethermoelectricmaterial
_version_	1718372977862508544

High seebeck coefficient and low thermal conductivity in Bi and In co-doped GeTe thermoelectric material

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