中国物理B ›› 2018, Vol. 27 ›› Issue (11): 118105-118105.doi: 10.1088/1674-1056/27/11/118105

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Excellent thermal stability and thermoelectric properties of Pnma-phase SnSe in middle temperature aerobic environment

Yu Tang(唐语), Decong Li(李德聪), Zhong Chen(陈钟), Shuping Deng(邓书平), Luqi Sun(孙璐琪), Wenting Liu(刘文婷), Lanxian Shen(申兰先), Shukang Deng(邓书康)   

  1. 1 Education Ministry Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology, Yunnan Normal University, Kunming 650500, China;
    2 Photoelectric Engineering College, Yunnan Open University, Kunming 650500, China
  • 收稿日期:2018-07-03 修回日期:2018-08-10 出版日期:2018-11-05 发布日期:2018-11-05
  • 通讯作者: Shukang Deng E-mail:skdeng@126.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61864012).

Excellent thermal stability and thermoelectric properties of Pnma-phase SnSe in middle temperature aerobic environment

Yu Tang(唐语)1, Decong Li(李德聪)1,2, Zhong Chen(陈钟)1, Shuping Deng(邓书平)1, Luqi Sun(孙璐琪)1, Wenting Liu(刘文婷)1, Lanxian Shen(申兰先)1, Shukang Deng(邓书康)1   

  1. 1 Education Ministry Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology, Yunnan Normal University, Kunming 650500, China;
    2 Photoelectric Engineering College, Yunnan Open University, Kunming 650500, China
  • Received:2018-07-03 Revised:2018-08-10 Online:2018-11-05 Published:2018-11-05
  • Contact: Shukang Deng E-mail:skdeng@126.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61864012).

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摘要：

SnSe is considered to be a promising thermoelectric material due to a high ZT value and abundant and non-toxic composition elements. However, the thermal stability is an important issue for commercial application. In particular, thermoelectric materials are in the high temperature for a long time due to the working condition. The present work investigates the thermal stability and oxidation resistance of single crystal SnSe thermoelectric materials. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that the internal of SnSe crystal is not easily oxidized, while the x-ray photoelectron spectroscopy (XPS) results indicate that the surface of SnSe is slight oxidized to SnO2. Even if the surface is oxidized, the SnSe crystal still exhibits stable thermoelectric properties. Meanwhile, the crystallization quality of SnSe samples can be improved after the appropriate heat treatment in the air, which is in favor of the carrier mobility and can improve the electrical conduction properties of SnSe. Moreover, the decrease of defect density after heat treatment can further improve the Seebeck coefficient and electrical transport properties of SnSe. The density functional theory (DFT) calculation verifies the important role of defect on the electrical conductivity and electron configuration. In summary, appropriate temperature annealing is an effective way to improve the transmission properties of SnSe single crystal thermoelectric materials.

关键词: SnSe, thermal stability, annealing, electrical transport properties, density functional theory

Abstract:

SnSe is considered to be a promising thermoelectric material due to a high ZT value and abundant and non-toxic composition elements. However, the thermal stability is an important issue for commercial application. In particular, thermoelectric materials are in the high temperature for a long time due to the working condition. The present work investigates the thermal stability and oxidation resistance of single crystal SnSe thermoelectric materials. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that the internal of SnSe crystal is not easily oxidized, while the x-ray photoelectron spectroscopy (XPS) results indicate that the surface of SnSe is slight oxidized to SnO2. Even if the surface is oxidized, the SnSe crystal still exhibits stable thermoelectric properties. Meanwhile, the crystallization quality of SnSe samples can be improved after the appropriate heat treatment in the air, which is in favor of the carrier mobility and can improve the electrical conduction properties of SnSe. Moreover, the decrease of defect density after heat treatment can further improve the Seebeck coefficient and electrical transport properties of SnSe. The density functional theory (DFT) calculation verifies the important role of defect on the electrical conductivity and electron configuration. In summary, appropriate temperature annealing is an effective way to improve the transmission properties of SnSe single crystal thermoelectric materials.

Key words: SnSe, thermal stability, annealing, electrical transport properties, density functional theory

中图分类号:  (Other semiconductors)

  • 81.05.Hd
72.20.Pa (Thermoelectric and thermomagnetic effects) 81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization) 31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))