Band engineering and precipitation enhance thermoelectric performance of SnTe with Zn-doping

被引：24

作者：

Chen, Zhiyu ^{[1
]}

Wang, Ruifeng ^{[2
,3
]}

Wang, Guoyu ^{[2
,3
]}

Zhou, Xiaoyuan ^{[4
]}

Wang, Zhengshang ^{[1
]}

Yin, Cong ^{[1
]}

Hu, Qing ^{[1
]}

Zhou, Binqiang ^{[5
]}

Tang, Jun ^{[1
,6
]}

Ang, Ran ^{[1
,6
]}

机构：

[1] Sichuan Univ, Inst Nucl Sci & Technol, Minist Educ, Key Lab Radiat Phys & Technol, Chengdu 610064, Sichuan, Peoples R China

[2] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100190, Peoples R China

[4] Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China

[5] Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China

[6] Sichuan Univ, Inst New Energy & Low Carbon Technol, Chengdu 610065, Sichuan, Peoples R China

来源：

CHINESE PHYSICS B | 2018年 / 27卷 / 04期

基金：

中国国家自然科学基金;

关键词：

thermoelectric materials; chalcogenide; band engineering; precipitation; CONVERGENCE; EFFICIENCY;

D O I：

10.1088/1674-1056/27/4/047202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have systematically studied the thermoelectric properties in Zn-doped SnTe. Strikingly, band convergence and embedded precipitates arising from Zn doping, can trigger a prominent improvement of thermoelectric performance. In particular, the value of dimensionless figure of merit zT has increased by 100% and up to similar to 0.5 at 775 K for the optimal sample with 2% Zn content. Present findings demonstrate that carrier concentration and effective mass play crucial roles on the Seebeck coefficient and power factor. The obvious deviation from the Pisarenko line (Seebeck coefficient versus carrier concentration) due to Zn-doping reveals the convergence of valence bands. When the doping concentration exceeds the solubility, precipitates occur and lead to a reduction of lattice thermal conductivity. In addition, bipolar conduction is suppressed, indicating an enlargement of band gap. The Zn-doped SnTe is shown to be a promising candidate for thermoelectric applications.

引用

页数：5

共 31 条

[1] Mg Alloying in SnTe Facilitates Valence Band Convergence and Optimizes Thermoelectric Properties [J].

Banik, Ananya ;

Shenoy, U. Sandhya ;

Anand, Shashwat ;

Waghmare, Umesh V. ;

Biswas, Kanishka .

CHEMISTRY OF MATERIALS, 2015, 27 (02) :581-587

[2] Improved thermoelectric performance in p-type Bi0.48Sb1.52Te3 bulk material by adding MnSb2Se4 [J].

Cao, Binglei ;

Jian, Jikang ;

Ge, Binghui ;

Li, Shanming ;

Wang, Hao ;

Liu, Jiao ;

Zhao, Huaizhou .

CHINESE PHYSICS B, 2017, 26 (01)

[3] First-principles study on band structures and electrical transports of doped-SnTe [J].

Dong, Xiao ;

Yu, Hulei ;

Li, Wen ;

Pei, Yanzhong ;

Chen, Yue .

JOURNAL OF MATERIOMICS, 2016, 2 (02) :158-164

[4] Realizing high figure of merit in heavy-band p-type half-Heusler thermoelectric materials [J].

Fu, Chenguang ;

Bai, Shengqiang ;

Liu, Yintu ;

Tang, Yunshan ;

Chen, Lidong ;

Zhao, Xinbing ;

Zhu, Tiejun .

NATURE COMMUNICATIONS, 2015, 6

[5] Zintl phases for thermoelectric devices [J].

Kauzlarich, Susan M. ;

Brown, Shawna R. ;

Snyder, G. Jeffrey .

DALTON TRANSACTIONS, 2007, (21) :2099-2107

[6] New bulk Materials for Thermoelectric Power Generation: Clathrates and Complex Antimonides [J].

Kleinke, Holger .

CHEMISTRY OF MATERIALS, 2010, 22 (03) :604-611

[7] Reevaluation of PbTe1-xIx as high performance n-type thermoelectric material [J].

LaLonde, Aaron D. ;

Pei, Yanzhong ;

Snyder, G. Jeffrey .

ENERGY & ENVIRONMENTAL SCIENCE, 2011, 4 (06) :2090-2096

[8] Advances in Environment-Friendly SnTe Thermoelectrics [J].

Li, Wen ;

Wu, Yixuan ;

Lin, Siqi ;

Chen, Zhiwei ;

Li, Juan ;

Zhang, Xinyue ;

Zheng, Linglang ;

Pei, Yanzhong .

ACS ENERGY LETTERS, 2017, 2 (10) :2349-2355

[9] Promoting SnTe as an Eco-Friendly Solution for p-PbTe Thermoelectric via Band Convergence and Interstitial Defects [J].

Li, Wen ;

Zheng, Linglang ;

Ge, Binghui ;

Lin, Siqi ;

Zhang, Xinyue ;

Chen, Zhiwei ;

Chang, Yunjie ;

Pei, Yanzhong .

ADVANCED MATERIALS, 2017, 29 (17)

[10] Band and scattering tuning for high performance thermoelectric Sn1-xMnxTe alloys [J].

Li, Wen ;

Chen, Zhiwei ;

Lin, Siqi ;

Chang, Yunjie ;

Ge, Binghui ;

Chen, Yue ;

Pei, Yanzhong .

JOURNAL OF MATERIOMICS, 2015, 1 (04) :307-315

← 1 2 3 4 →