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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-12-01
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| Series: | Journal of Materiomics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847819300784 |
| _version_ | 1797758505686401024 |
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| author | Beibei Li Renshuang Zhai Teng Fang Kaiyang Xia Yongjun Wu Tiejun Zhu |
| author_facet | Beibei Li Renshuang Zhai Teng Fang Kaiyang Xia Yongjun Wu Tiejun Zhu |
| author_sort | Beibei Li |
| collection | DOAJ |
| 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 |
| first_indexed | 2024-03-12T18:29:57Z |
| format | Article |
| id | doaj.art-57200be76097426989e7b0e670c895a3 |
| institution | Directory Open Access Journal |
| issn | 2352-8478 |
| language | English |
| last_indexed | 2024-03-12T18:29:57Z |
| publishDate | 2019-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj.art-57200be76097426989e7b0e670c895a32023-08-02T08:19:26ZengElsevierJournal 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 |
| 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 |
| title | 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_short | 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 |
| url | http://www.sciencedirect.com/science/article/pii/S2352847819300784 |
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