Realizing high thermoelectric performance of polycrystalline SnS through optimizing carrier concentration and modifying band structure

Wang, Ziyao1; Wang, Dongyang1; Qiu, Yuting2; He, Jiaqing3; Zhao, Li-Dong1

2019-06-15

10.1016/j.jallcom.2019.03.031

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

Tin sulfide (SnS), a typical IV-VI compound with low-cost, abundant-earth and eco-friendly elements, has aroused widespread attentions in the thermoelectric community due to its similar electron and phonon structures with SnSe. However, undoped SnS possesses the features of low carrier concentration and inferior band structures, which produces indecent thermoelectric performance. In this work, we successfully resolved these shortcomings of SnS through stepwise Na doping and Se alloying. Firstly, the carrier concentration of SnS was increased and optimized through Na doping, which leads to an enhancement both in electrical conductivity and Seebeck coefficients through activating multiple valance bands. Secondly, the electronic band structure of SnS was modified through Se alloying, both narrowing band gap and flatting valence band shape contribute excellent electrical transport properties, resulting in maximum power factor similar to 6.0 mu Wcm(-1)K(-2). After synergistically optimizing interdependent thermoelectric parameters through Na doping and Se alloying, a record high ZT of 0.70 at 873 K was obtained in polycrystalline SnS. Our work indicates that SnS is one of very promising earth-abundant thermoelectric materials for power generation in mediate-temperature range. (C) 2019 Elsevier B.V. All rights reserved.

Thermoelectric Polycrystalline SnS Electronic band structure Carrier concentrations

SCI ; EI

英语

其他

111 Project[B17002]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000464542700058

ELSEVIER SCIENCE SA

20191106624937

Alloying ; Carrier concentration ; Energy gap ; IV-VI semiconductors ; Layered semiconductors ; Phonons ; Sodium alloys ; Sulfur compounds ; Thermoelectricity ; Tin compounds

Metallurgy:531.1 ; Tin and Alloys:546.2 ; Alkali Metals:549.1 ; Electricity: Basic Concepts and Phenomena:701.1

MATERIALS SCIENCE

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.Beihang Univ, Engn Training Ctr, Beijing 100191, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Wang, Ziyao,Wang, Dongyang,Qiu, Yuting,et al. Realizing high thermoelectric performance of polycrystalline SnS through optimizing carrier concentration and modifying band structure[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,789:485-492.

Wang, Ziyao,Wang, Dongyang,Qiu, Yuting,He, Jiaqing,&Zhao, Li-Dong.(2019).Realizing high thermoelectric performance of polycrystalline SnS through optimizing carrier concentration and modifying band structure.JOURNAL OF ALLOYS AND COMPOUNDS,789,485-492.

Wang, Ziyao,et al."Realizing high thermoelectric performance of polycrystalline SnS through optimizing carrier concentration and modifying band structure".JOURNAL OF ALLOYS AND COMPOUNDS 789(2019):485-492.