Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Exploring Thermoelectric Transport Properties and Band Parameters of n-Type Bi2-xSbxTe3 Compounds Using the Single Parabolic Band Model

  • Linh Ba Vu (Department of 3D Printing Materials, Korea Institute of Materials Science) ;
  • Soo-ho Jung (Department of 3D Printing Materials, Korea Institute of Materials Science) ;
  • Jinhee Bae (Department of 3D Printing Materials, Korea Institute of Materials Science) ;
  • Jong Min Park (Department of 3D Printing Materials, Korea Institute of Materials Science) ;
  • Kyung Tae Kim (Department of 3D Printing Materials, Korea Institute of Materials Science) ;
  • Injoon Son (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Seungki Jo (Department of 3D Printing Materials, Korea Institute of Materials Science)
  • Received : 2024.04.08
  • Accepted : 2024.04.21
  • Published : 2024.04.28
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Abstract

The n-type Bi2-xSbxTe3 compounds have been of great interest due to its potential to achieve a high thermoelectric performance, comparable to that of p-type Bi2-xSbxTe3. However, a comprehensive understanding on the thermoelectric properties remains lacking. Here, we investigate the thermoelectric transport properties and band characteristics of n-type Bi2-xSbxTe3 (x = 0.1 - 1.1) based on experimental and theoretical considerations. We find that the higher power factor at lower Sb content results from the optimized balance between the density of state effective mass and nondegenerate mobility. Additionally, a higher carrier concentration at lower x suppresses bipolar conduction, thereby reducing thermal conductivity at elevated temperatures. Consequently, the highest zT of ~ 0.5 is observed at 450 K for x = 0.1 and, according to the single parabolic band model, it could be further improved by ~70 % through carrier concentration tuning.

Keywords

Acknowledgement

This work was supported by KIMS' Principal R&D project (PNK9950) and the NRF' project (code no. 2021M3C1C3097540)of the Republc of Korea.

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