Realizing tremendous electrical transport properties of polycrystalline SnSe2 by Cl-doped and anisotropy

Shaohai Wu, Chengyan Liu, Zhengsen Wu, Lei Miao, Jie Gao, Xiaokai Hu, Junliang Chen, Yanyan Zheng, Xiuxia Wang, Chengjin Shen, Hengquan Yang, Xiaoyuan Zhou

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

SnSe2 is regarded as an attractive thermoelectric material for its structural and chemical analogy to SnSe that is claimed with the highest ZT in single crystal. In this study, the pure and Cl-doped SnSe2 polycrystals (3%, 6%, 9% and 12% molar Cl content) were fabricated in four steps that are hydrothermal synthesis, heating purification, diffusion doping, and spark plasma sintering. The phase structure, lamellar morphology and crystallite orientation were studied for the synthesized SnSe2 powder and the sintered pellets. The structural evolution was traced from the SnSe2 hexagonal plates of powders to the (001) oriented grains in pellets. The Cl doping into SnSe2 was verified by phase composition, lattice parameter, element distribution, and chemical valance. The doped Cl increased both the carrier concentration and the mobility. The anisotropic thermoelectric properties of SnSe2 bulk materials were investigated as functions of temperature from 50 °C to 300 °C and the doping amount, respectively. The Seebeck coefficient was less anisotropic than the electrical and thermal conduction. The grain orientation influenced the anisotropy of the electrical and thermal conductivity at a similar ratio. The power factors were less dependent on temperature with an optimum in-plane 1.06 mW m−1 K−2 and out-of-plane 0.41 mW m−1 K−2. The highest ZTs of 0.3 were attained at 300 °C in both directions.

Original languageEnglish
Pages (from-to)82-89
Number of pages8
JournalCeramics International
Volume45
Issue number1
DOIs
Publication statusPublished - 2019 Jan
Externally publishedYes

Keywords

  • Anisotropy
  • Cl-doped
  • Electrical transport property
  • SnSe

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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  • Cite this

    Wu, S., Liu, C., Wu, Z., Miao, L., Gao, J., Hu, X., Chen, J., Zheng, Y., Wang, X., Shen, C., Yang, H., & Zhou, X. (2019). Realizing tremendous electrical transport properties of polycrystalline SnSe2 by Cl-doped and anisotropy. Ceramics International, 45(1), 82-89. https://doi.org/10.1016/j.ceramint.2018.09.136