Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying

Forming solid solutions in PbTe based materials can simultaneously reduce lattice thermal conductivity and engineer the band structure to enhance the electrical properties. In this paper, quaternary alloys of Pb1−xMgxTe0.8Se0.2 were designed to improve the figure of merit zT. The significant roles o...

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Main Authors:	Tiezheng Fu, Xianqiang Yue, Haijun Wu, Chenguang Fu, Tiejun Zhu, Xiaohua Liu, Lipeng Hu, Pingjun Ying, Jiaqing He, Xinbing Zhao
Format:	Article
Language:	English
Published:	Elsevier 2016-06-01
Series:	Journal of Materiomics
Subjects:	Thermoelectric Alloying PbTe Band engineering Thermal conductivity
Online Access:	http://www.sciencedirect.com/science/article/pii/S2352847816300338

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spelling	doaj-b3d504c04a004701a1c817a1de9555f12020-11-24T23:21:12ZengElsevierJournal of Materiomics2352-84782016-06-012214114910.1016/j.jmat.2016.05.005Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloyingTiezheng Fu0Xianqiang Yue1Haijun Wu2Chenguang Fu3Tiejun Zhu4Xiaohua Liu5Lipeng Hu6Pingjun Ying7Jiaqing He8Xinbing Zhao9State 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, ChinaDepartment of Physics, South University of Science and Technology of China, Shenzhen 518055, 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, 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, ChinaDepartment of Physics, South University of Science and Technology of China, Shenzhen 518055, ChinaState Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaForming solid solutions in PbTe based materials can simultaneously reduce lattice thermal conductivity and engineer the band structure to enhance the electrical properties. In this paper, quaternary alloys of Pb1−xMgxTe0.8Se0.2 were designed to improve the figure of merit zT. The significant roles of MgTe in enhancing electrical properties and reducing thermal conductivity of PbTe0.8Se0.2 were investigated. A maximum zT of ∼2.2 at 820 K was achieved in PbTe0.8Se0.2 with 8% MgTe. Subsequently, a large dimension bulk (∼200 g, Φ42 mm × 18 mm) was fabricated and its homogeneity and the repeatability of high zT values were determined. The results show that high zT ∼2.0 can also be achieved even in such a large sample. These results highlight the multi-functional roles of quaternary alloying with Mg and Se, and demonstrate the realistic prospect of large-scale commercial fabrication in high performance PbTe-based thermoelectric materials.http://www.sciencedirect.com/science/article/pii/S2352847816300338ThermoelectricAlloyingPbTeBand engineeringThermal conductivity
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Tiezheng Fu Xianqiang Yue Haijun Wu Chenguang Fu Tiejun Zhu Xiaohua Liu Lipeng Hu Pingjun Ying Jiaqing He Xinbing Zhao
spellingShingle	Tiezheng Fu Xianqiang Yue Haijun Wu Chenguang Fu Tiejun Zhu Xiaohua Liu Lipeng Hu Pingjun Ying Jiaqing He Xinbing Zhao Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying Journal of Materiomics Thermoelectric Alloying PbTe Band engineering Thermal conductivity
author_facet	Tiezheng Fu Xianqiang Yue Haijun Wu Chenguang Fu Tiejun Zhu Xiaohua Liu Lipeng Hu Pingjun Ying Jiaqing He Xinbing Zhao
author_sort	Tiezheng Fu
title	Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying
title_short	Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying
title_full	Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying
title_fullStr	Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying
title_full_unstemmed	Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying
title_sort	enhanced thermoelectric performance of pbte bulk materials with figure of merit zt >2 by multi-functional alloying
publisher	Elsevier
series	Journal of Materiomics
issn	2352-8478
publishDate	2016-06-01
description	Forming solid solutions in PbTe based materials can simultaneously reduce lattice thermal conductivity and engineer the band structure to enhance the electrical properties. In this paper, quaternary alloys of Pb1−xMgxTe0.8Se0.2 were designed to improve the figure of merit zT. The significant roles of MgTe in enhancing electrical properties and reducing thermal conductivity of PbTe0.8Se0.2 were investigated. A maximum zT of ∼2.2 at 820 K was achieved in PbTe0.8Se0.2 with 8% MgTe. Subsequently, a large dimension bulk (∼200 g, Φ42 mm × 18 mm) was fabricated and its homogeneity and the repeatability of high zT values were determined. The results show that high zT ∼2.0 can also be achieved even in such a large sample. These results highlight the multi-functional roles of quaternary alloying with Mg and Se, and demonstrate the realistic prospect of large-scale commercial fabrication in high performance PbTe-based thermoelectric materials.
topic	Thermoelectric Alloying PbTe Band engineering Thermal conductivity
url	http://www.sciencedirect.com/science/article/pii/S2352847816300338
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Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying

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