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Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator

We investigated the thermoelectric properties of the Pb(0.75)Sn(0.25)Se and Pb(0.79)Sn(0.25)Se(1−x)Cl(x) (x = 0.0, 0.2, 0.3, 0.5, 1.0, 2.0 mol.%) compounds, synthesized by hot-press sintering. The electrical transport properties showed that low concentration doping of Cl (below 0.3 mol.%) in the Pb-...

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Autores principales: Kim, Jin Hee, Kim, Gareoung, Byeon, Seokyeong, Jin, Hyungyu, Rhyee, Jong-Soo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8069562/
https://www.ncbi.nlm.nih.gov/pubmed/33921358
http://dx.doi.org/10.3390/ma14081920
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author Kim, Jin Hee
Kim, Gareoung
Byeon, Seokyeong
Jin, Hyungyu
Rhyee, Jong-Soo
author_facet Kim, Jin Hee
Kim, Gareoung
Byeon, Seokyeong
Jin, Hyungyu
Rhyee, Jong-Soo
author_sort Kim, Jin Hee
collection PubMed
description We investigated the thermoelectric properties of the Pb(0.75)Sn(0.25)Se and Pb(0.79)Sn(0.25)Se(1−x)Cl(x) (x = 0.0, 0.2, 0.3, 0.5, 1.0, 2.0 mol.%) compounds, synthesized by hot-press sintering. The electrical transport properties showed that low concentration doping of Cl (below 0.3 mol.%) in the Pb-excess (Pb,Sn)Se samples increased the carrier concentration and the Hall mobility by the increase of carriers’ mean free path. The effective mass of the carrier was also enhanced from the measurements of the Seebeck coefficient. The enhanced effective masses of the carrier by the Cl-doping can be understood by the enhanced electron-phonon interaction, caused by the crystalline mirror symmetry breaking. The significantly decreased lattice thermal conductivities showed that the crystalline mirror symmetry breaking decreased the lattice thermal conductivity of the Pb-excess (Pb,Sn)Se. By the Cl-doping and the Pb-excess’s synergistic effect, which can suppress the bipolar effect, the zT values of x = 0.2 and 0.3 mol.% reached 0.8 at 773 K. Therefore, we suggest that Pb-excess and the crystalline mirror symmetry breaking by Cl-doping are effective for high thermoelectric performance in the (Pb,Sn)Se.
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spelling pubmed-80695622021-04-26 Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator Kim, Jin Hee Kim, Gareoung Byeon, Seokyeong Jin, Hyungyu Rhyee, Jong-Soo Materials (Basel) Article We investigated the thermoelectric properties of the Pb(0.75)Sn(0.25)Se and Pb(0.79)Sn(0.25)Se(1−x)Cl(x) (x = 0.0, 0.2, 0.3, 0.5, 1.0, 2.0 mol.%) compounds, synthesized by hot-press sintering. The electrical transport properties showed that low concentration doping of Cl (below 0.3 mol.%) in the Pb-excess (Pb,Sn)Se samples increased the carrier concentration and the Hall mobility by the increase of carriers’ mean free path. The effective mass of the carrier was also enhanced from the measurements of the Seebeck coefficient. The enhanced effective masses of the carrier by the Cl-doping can be understood by the enhanced electron-phonon interaction, caused by the crystalline mirror symmetry breaking. The significantly decreased lattice thermal conductivities showed that the crystalline mirror symmetry breaking decreased the lattice thermal conductivity of the Pb-excess (Pb,Sn)Se. By the Cl-doping and the Pb-excess’s synergistic effect, which can suppress the bipolar effect, the zT values of x = 0.2 and 0.3 mol.% reached 0.8 at 773 K. Therefore, we suggest that Pb-excess and the crystalline mirror symmetry breaking by Cl-doping are effective for high thermoelectric performance in the (Pb,Sn)Se. MDPI 2021-04-12 /pmc/articles/PMC8069562/ /pubmed/33921358 http://dx.doi.org/10.3390/ma14081920 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kim, Jin Hee
Kim, Gareoung
Byeon, Seokyeong
Jin, Hyungyu
Rhyee, Jong-Soo
Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title_full Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title_fullStr Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title_full_unstemmed Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title_short Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator
title_sort synergistic enhancement of thermoelectric performances by cl-doping and pb-excess in (pb,sn)se topological crystal insulator
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8069562/
https://www.ncbi.nlm.nih.gov/pubmed/33921358
http://dx.doi.org/10.3390/ma14081920
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