Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary

Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary

(Bi,Sb)2(Te,Se)3 alloys are widely used commercial thermoelectric (TE) materials for solid-state refrigeration around room temperature. The composition-induced structural phase transition could be realized by varying the compositions in these alloys, which may largely alter the electronic structure...

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Main Authors: Beibei Li, Renshuang Zhai, Teng Fang, Kaiyang Xia, Yongjun Wu, Tiejun Zhu
Format: Article
Language:English
Published: Elsevier 2019-12-01
Series:Journal of Materiomics
Online Access:http://www.sciencedirect.com/science/article/pii/S2352847819300784
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spelling doaj-57200be76097426989e7b0e670c895a32020-11-25T02:47:49ZengElsevierJournal of Materiomics2352-84782019-12-0154590596Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundaryBeibei Li0Renshuang Zhai1Teng Fang2Kaiyang Xia3Yongjun Wu4Tiejun Zhu5State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaState Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaState Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaState Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaCorresponding author.; State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaCorresponding author.; State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China(Bi,Sb)2(Te,Se)3 alloys are widely used commercial thermoelectric (TE) materials for solid-state refrigeration around room temperature. The composition-induced structural phase transition could be realized by varying the compositions in these alloys, which may largely alter the electronic structure and phonon dispersion. Among them, the Se-alloyed Sb2Te3 accompanied with structural transition is seldom reported. Herein, the interrelations of Se-alloying induced changes in structural phase transition, band structure and TE properties of p-type zone-melted Sb2Te3-xSex (x = 1.5–2.4) alloys near phase transition boundary are systematically investigated. The results demonstrate that Sb2Te3-xSex shows a structural transition from a rhombohedral phase to mixed structure at x = 2.0. The carrier concentration and bandgap at room temperature of Sb2Te3-xSex (x = 1.5–2.4) constantly decrease with increasing Se contents x. The zT peak of the Sb2TeSe2 matrix is improved and shifted to higher temperature by optimizing carrier concentration via Ag doping. A maximum zT of ∼0.4 is obtained at 680 K in Sb1.97Ag0.03TeSe2 alloy, about 100% enhancement compared with the undoped sample. Keywords: Thermoelectric materials, Zone melting, Structural transition, Doping, Thermoelectric propertieshttp://www.sciencedirect.com/science/article/pii/S2352847819300784
collection DOAJ
language English
format Article
sources DOAJ
author Beibei Li
Renshuang Zhai
Teng Fang
Kaiyang Xia
Yongjun Wu
Tiejun Zhu
spellingShingle Beibei Li
Renshuang Zhai
Teng Fang
Kaiyang Xia
Yongjun Wu
Tiejun Zhu
Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
Journal of Materiomics
author_facet Beibei Li
Renshuang Zhai
Teng Fang
Kaiyang Xia
Yongjun Wu
Tiejun Zhu
author_sort Beibei Li
title Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
title_short Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
title_full Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
title_fullStr Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
title_full_unstemmed Mid-temperature thermoelectric performance of zone-melted Sb2(Te,Se)3 alloys near phase transition boundary
title_sort mid-temperature thermoelectric performance of zone-melted sb2(te,se)3 alloys near phase transition boundary
publisher Elsevier
series Journal of Materiomics
issn 2352-8478
publishDate 2019-12-01
description (Bi,Sb)2(Te,Se)3 alloys are widely used commercial thermoelectric (TE) materials for solid-state refrigeration around room temperature. The composition-induced structural phase transition could be realized by varying the compositions in these alloys, which may largely alter the electronic structure and phonon dispersion. Among them, the Se-alloyed Sb2Te3 accompanied with structural transition is seldom reported. Herein, the interrelations of Se-alloying induced changes in structural phase transition, band structure and TE properties of p-type zone-melted Sb2Te3-xSex (x = 1.5–2.4) alloys near phase transition boundary are systematically investigated. The results demonstrate that Sb2Te3-xSex shows a structural transition from a rhombohedral phase to mixed structure at x = 2.0. The carrier concentration and bandgap at room temperature of Sb2Te3-xSex (x = 1.5–2.4) constantly decrease with increasing Se contents x. The zT peak of the Sb2TeSe2 matrix is improved and shifted to higher temperature by optimizing carrier concentration via Ag doping. A maximum zT of ∼0.4 is obtained at 680 K in Sb1.97Ag0.03TeSe2 alloy, about 100% enhancement compared with the undoped sample. Keywords: Thermoelectric materials, Zone melting, Structural transition, Doping, Thermoelectric properties
url http://www.sciencedirect.com/science/article/pii/S2352847819300784
work_keys_str_mv AT beibeili midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
AT renshuangzhai midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
AT tengfang midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
AT kaiyangxia midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
AT yongjunwu midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
AT tiejunzhu midtemperaturethermoelectricperformanceofzonemeltedsb2tese3alloysnearphasetransitionboundary
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