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Effects of doping on the positional uniformity of the thermoelectric properties of n-type Bi2Te2.7Se0.3 polycrystalline bulks

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Abstract

The reproducibility problem is one of the central issues in n-type Bi2Te3-based thermoelectric materials. We herein investigate the effects of doping on the positional uniformity of the electronic transport properties of spark-plasma-sintered Bi2Te2.7Se0.3 polycrystalline bulks. Both the electrical conductivity and the Seebeck coefficient showed severe deviations with position in the pristine Bi2Te2.7Se0.3 bulk due to the variation in carrier concentration originating from the formation of Te- and Se-site vacancies. This non-uniformity problem could be significantly improved by the addition of excess elemental Cu and Te. Uniformity enhanced by Cu addition might be considered to be related with the suppression of Te/Se evaporation in the presence of intercalated Cu atoms. A maximum power factor value of ∼2.72 mW/mK2 at 300 K was obtained for Cu0.01Bi2Te2.7Se0.3.

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Authors and Affiliations

  1. School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan, 31253, Korea

    Soon-Mok Choi

  2. Department of Nano Applied Engineering, Kangwon National University, Chuncheon, 24341, Korea

    Kyu Hyoung Lee

  3. Department of Materials System Engineering, Pukyong National University, Pusan, 48513, Korea

    Young Soo Lim

  4. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Jinju, 52851, Korea

    Won-Seon Seo & Soonil Lee

Authors
  1. Soon-Mok Choi
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  2. Kyu Hyoung Lee
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  3. Young Soo Lim
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  4. Won-Seon Seo
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  5. Soonil Lee
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Correspondence to Kyu Hyoung Lee.

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Choi, SM., Lee, K.H., Lim, Y.S. et al. Effects of doping on the positional uniformity of the thermoelectric properties of n-type Bi2Te2.7Se0.3 polycrystalline bulks. Journal of the Korean Physical Society 68, 17–21 (2016). https://doi.org/10.3938/jkps.68.17

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  • DOI: https://doi.org/10.3938/jkps.68.17

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