Current Applied Physics

Korean Physical Society (한국물리학회)
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High thermoelectric performance and low thermal conductivity in K-doped SnSe polycrystalline compounds

  • Lin, Chan-Chieh (Dept. of Applied Physics and Institutes of Natural Sciences, Kyung Hee University) ;
  • Ginting, Dianta (Dept. of Applied Physics and Institutes of Natural Sciences, Kyung Hee University) ;
  • Kim, Gareoung (Dept. of Applied Physics and Institutes of Natural Sciences, Kyung Hee University) ;
  • Ahn, Kyunghan (Dept. of Applied Physics and Institutes of Natural Sciences, Kyung Hee University) ;
  • Rhyee, Jong-Soo (Dept. of Applied Physics and Institutes of Natural Sciences, Kyung Hee University)
  • Received : 2018.07.30
  • Accepted : 2018.09.20
  • Published : 2018.12.31
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Abstract

SnSe single crystal showed a high thermoelectric zT of 2.6 at 923 K mainly due to an extremely low thermal conductivity $0.23W\;m^{-1}\;K^{-1}$. It has anisotropic crystal structure resulting in deterioration of thermoelectric performance in polycrystalline SnSe, providing a low zT of 0.6 and 0.8 for Ag and Na-doped SnSe, respectively. Here, we presented the thermoelectric properties on the K-doped $K_xSn_{1-x}Se$ (x = 0, 0.1, 0.3, 0.5, 1.5, and 2.0%) polycrystals, synthesized by a high-temperature melting and hot-press sintering with annealing process. The K-doping in SnSe efficiently enhances the hole carrier concentration without significant degradation of carrier mobility. We find that there exist widespread Se-rich precipitates, inducing strong phonon scattering and thus resulting in a very low thermal conductivity. Due to low thermal conductivity and moderate power factor, the $K_{0.001}Sn_{0.999}Se$ sample shows an exceptionally high zT of 1.11 at 823 K which is significantly enhanced value in polycrystalline compounds.

Keywords

Acknowledgement

Supported by : Korea Evaluation Institute of Industrial Technology (KEIT)

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