Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system

Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generate...

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Autores principales:	Kyu Hyoung Lee, Yurian Kim, Dong Ho Kim, Chul Oh Park, Hyun-Sik Kim, Sang-il Kim
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Bi2Te3 Bi2S3 Composite Thermoelectric Phase formation Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/a8afb50daf1f43ad9673fd745b6bdb92
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spelling	oai:doaj.org-article:a8afb50daf1f43ad9673fd745b6bdb922021-11-06T04:29:34ZStudies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system2238-785410.1016/j.jmrt.2021.10.049https://doaj.org/article/a8afb50daf1f43ad9673fd745b6bdb922021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421011856https://doaj.org/toc/2238-7854Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu0.008Bi2Te3; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu0.008Bi2Te2.8S0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.Kyu Hyoung LeeYurian KimDong Ho KimChul Oh ParkHyun-Sik KimSang-il KimElsevierarticleBi2Te3Bi2S3CompositeThermoelectricPhase formationMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 4781-4789 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Bi2Te3 Bi2S3 Composite Thermoelectric Phase formation Mining engineering. Metallurgy TN1-997
spellingShingle	Bi2Te3 Bi2S3 Composite Thermoelectric Phase formation Mining engineering. Metallurgy TN1-997 Kyu Hyoung Lee Yurian Kim Dong Ho Kim Chul Oh Park Hyun-Sik Kim Sang-il Kim Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
description	Herein, we investigated the influence of sulfur (S) addition on the phase formation behavior and thermoelectric transport properties of n-type Cu0.008Bi2Te3. A complete single phase of rhombohedral Bi2Te3 was formed in Cu0.008Bi2Te2.8S0.2, whereas a mixture of Bi2Te3 and Bi2Te2S1 phases was generated at higher S contents. We elucidated the complex effects of S substitution at Te-site on transport properties of Cu0.008Bi2Te3; (1) increase in density-of-states effective mass, (2) decrease in weighted mobility ratio, (3) reduction in lattice thermal conductivity, and (4) reduction in bipolar thermal conductivity. Despite the slight deterioration in electronic transport properties, a maximum thermoelectric figure of merit (zT) of 0.82 was achieved at 400 K in Cu0.008Bi2Te2.8S0.2 due to the synergetic effect of intensified point defect phonon scattering in a wide temperature range and suppressed bipolar thermal conduction at elevated temperatures.
format	article
author	Kyu Hyoung Lee Yurian Kim Dong Ho Kim Chul Oh Park Hyun-Sik Kim Sang-il Kim
author_facet	Kyu Hyoung Lee Yurian Kim Dong Ho Kim Chul Oh Park Hyun-Sik Kim Sang-il Kim
author_sort	Kyu Hyoung Lee
title	Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
title_short	Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
title_full	Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
title_fullStr	Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
title_full_unstemmed	Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system
title_sort	studies on phase formation behavior and thermoelectric transport properties of cu-doped bi2te3–bi2s3 system
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a8afb50daf1f43ad9673fd745b6bdb92
work_keys_str_mv	AT kyuhyounglee studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system AT yuriankim studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system AT donghokim studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system AT chulohpark studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system AT hyunsikkim studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system AT sangilkim studiesonphaseformationbehaviorandthermoelectrictransportpropertiesofcudopedbi2te3bi2s3system
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Studies on phase formation behavior and thermoelectric transport properties of Cu-doped Bi2Te3–Bi2S3 system

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