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

The reproducibility problem is one of the central issues in n -type Bi 2 Te 3 -based thermoelectric materials. We herein investigate the effects of doping on the positional uniformity of the electronic transport properties of spark-plasma-sintered Bi 2 Te 2.7 Se 0.3 polycrystalline bulks. Both the e...

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Veröffentlicht in:Journal of the Korean Physical Society 2016, 68(1), , pp.17-21
Hauptverfasser: Choi, Soon-Mok, Lee, Kyu Hyoung, Lim, Young Soo, Seo, Won-Seon, Lee, Soonil
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Sprache:eng
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Zusammenfassung:The reproducibility problem is one of the central issues in n -type Bi 2 Te 3 -based thermoelectric materials. We herein investigate the effects of doping on the positional uniformity of the electronic transport properties of spark-plasma-sintered Bi 2 Te 2.7 Se 0.3 polycrystalline bulks. Both the electrical conductivity and the Seebeck coefficient showed severe deviations with position in the pristine Bi 2 Te 2.7 Se 0.3 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/mK 2 at 300 K was obtained for Cu 0.01 Bi 2 Te 2.7 Se 0.3 .
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.68.17