Anisotropic thermoelectric transport properties in polycrystalline SnSe2

doi:10.1088/1674-1056/abeee1

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 67101-067101.doi: 10.1088/1674-1056/abeee1

Anisotropic thermoelectric transport properties in polycrystalline SnSe₂

Caiyun Li(李彩云), Wenke He(何文科), Dongyang Wang(王东洋), and Li-Dong Zhao(赵立东)^†

School of Materials Science and Engineering, Beihang University, Beijing 100191, China

收稿日期:2021-03-02 修回日期:2021-03-12 接受日期:2021-03-16 出版日期:2021-05-18 发布日期:2021-05-20
通讯作者: Li-Dong Zhao E-mail:zhaolidong@buaa.edu.cn
基金资助:
Project supported by the Beijing Natural Science Foundation, China (Grant No. JQ18004), the National Key Research and Development Program of China (Grant Nos. 2018YFA0702100 and 2018YFB0703600), the National Natural Science Foundation of China (Grant No. 51772012), Shenzhen Peacock Plan Team (Grant No. KQTD2016022619565991), and 111 Project (Grant No. B17002). This work was also supported by the National Postdoctoral Program for Innovative Talents, China (Grant No. BX20200028) and the high performance computing (HPC) resources at Beihang University. L.D.Z. thanks for the support from the National Science Fund for Distinguished Young Scholars (Grant No. 51925101).

Anisotropic thermoelectric transport properties in polycrystalline SnSe₂

Caiyun Li(李彩云), Wenke He(何文科), Dongyang Wang(王东洋), and Li-Dong Zhao(赵立东)^†

School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Received:2021-03-02 Revised:2021-03-12 Accepted:2021-03-16 Online:2021-05-18 Published:2021-05-20
Contact: Li-Dong Zhao E-mail:zhaolidong@buaa.edu.cn
Supported by:
Project supported by the Beijing Natural Science Foundation, China (Grant No. JQ18004), the National Key Research and Development Program of China (Grant Nos. 2018YFA0702100 and 2018YFB0703600), the National Natural Science Foundation of China (Grant No. 51772012), Shenzhen Peacock Plan Team (Grant No. KQTD2016022619565991), and 111 Project (Grant No. B17002). This work was also supported by the National Postdoctoral Program for Innovative Talents, China (Grant No. BX20200028) and the high performance computing (HPC) resources at Beihang University. L.D.Z. thanks for the support from the National Science Fund for Distinguished Young Scholars (Grant No. 51925101).

摘要/Abstract

摘要： It is reported that SnSe₂ consisting of the same elements as SnSe, is a new promising thermoelectric material with advantageous layered structure. In this work, the thermoelectric performance of polycrystalline SnSe₂ is improved through introducing SnSe phase and electron doping (Cl doped in Se sites). The anisotropic transport properties of SnSe₂ are investigated. A great reduction of the thermal conductivity is achieved in SnSe₂ through introducing SnSe phase, which mainly results from the strong SnSe₂-SnSe inter-phase scattering. Then the carrier concentration is optimized via Cl doping, leading to a great enhancement of the electrical transport properties, thus an extraordinary power factor of ~5.12 μW·cm^-1·K^-2 is achieved along the direction parallel to the spark plasma sintering (SPS) pressure direction (||P). Through the comprehensive consideration on the anisotropic thermoelectric transport properties, an enhanced figure of merit ZT is attained and reaches to ~0.6 at 773 K in SnSe₂-2% SnSe after 5% Cl doping along the||P direction, which is much higher than ~0.13 and ~0.09 obtained in SnSe₂-2% SnSe and pristine SnSe₂ samples, respectively.

关键词: thermoelectric, SnSe₂, anisotropic structure, Cl-doping

Abstract: It is reported that SnSe₂ consisting of the same elements as SnSe, is a new promising thermoelectric material with advantageous layered structure. In this work, the thermoelectric performance of polycrystalline SnSe₂ is improved through introducing SnSe phase and electron doping (Cl doped in Se sites). The anisotropic transport properties of SnSe₂ are investigated. A great reduction of the thermal conductivity is achieved in SnSe₂ through introducing SnSe phase, which mainly results from the strong SnSe₂-SnSe inter-phase scattering. Then the carrier concentration is optimized via Cl doping, leading to a great enhancement of the electrical transport properties, thus an extraordinary power factor of ~5.12 μW·cm^-1·K^-2 is achieved along the direction parallel to the spark plasma sintering (SPS) pressure direction (||P). Through the comprehensive consideration on the anisotropic thermoelectric transport properties, an enhanced figure of merit ZT is attained and reaches to ~0.6 at 773 K in SnSe₂-2% SnSe after 5% Cl doping along the||P direction, which is much higher than ~0.13 and ~0.09 obtained in SnSe₂-2% SnSe and pristine SnSe₂ samples, respectively.

Key words: thermoelectric, SnSe₂, anisotropic structure, Cl-doping

中图分类号: (Methods of electronic structure calculations)

71.15.-m

72.15.Cz (Electrical and thermal conduction in amorphous and liquid metals and Alloys ?) 72.20.Pa (Thermoelectric and thermomagnetic effects) 72.80.Rj (Fullerenes and related materials)

Caiyun Li(李彩云), Wenke He(何文科), Dongyang Wang(王东洋), and Li-Dong Zhao(赵立东). Anisotropic thermoelectric transport properties in polycrystalline SnSe₂[J]. 中国物理B, 2021, 30(6): 67101-067101.

Caiyun Li(李彩云), Wenke He(何文科), Dongyang Wang(王东洋), and Li-Dong Zhao(赵立东). Anisotropic thermoelectric transport properties in polycrystalline SnSe₂[J]. Chin. Phys. B, 2021, 30(6): 67101-067101.

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Anisotropic thermoelectric transport properties in polycrystalline SnSe₂

Anisotropic thermoelectric transport properties in polycrystalline SnSe₂

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