Thermoelectric properties of W1-xNbxSe2-ySy polycrystalline compounds
- 주제(키워드) conductivity , layered crystal structures , polycrystalline materials , thermal conductivity , thermoelectric properties
- 주제(기타) Materials Science, Ceramics
- 등재 SCIE, SCOPUS
- 발행기관 WILEY
- 발행년도 2019
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000161314
- 본문언어 영어
- Published As http://dx.doi.org/10.1111/jace.16455
초록/요약
We investigate the thermoelectric properties of bulk polycrystalline samples of WSe2-based compounds with partial substitutions in the cationic (W) and the anionic (Se) sublattices in the temperature range from 4.2 to 650 K. The substitution of W for Nb leads to a significant increase in the charge carrier concentration, however, deteriorates the charge carrier mobility. In contrast, the substitution of selenium for sulfur increases the charge carrier mobility, the thermal conductivity, and the Seebeck coefficient but conductivity changes non-monotonical. We show that the addition of sulfur in anionic sublattice affects the grain sizes in the polycrystalline material. Using substitutions in the anionic and cationic sublattices, we find the optimal ratio of the elements for better thermoelectric efficiency. The W0.98Nb0.02Se1.7S0.3 sample showed the best value of the figure of merit ZT = 0.26 (T = 650 K).
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