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Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms

Title
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms
Authors
Han, Mi-KyungJin, YingshiLee, Da-HeeKim, Sung-Jin
Ewha Authors
김성진한미경
SCOPUS Author ID
김성진scopus; 한미경scopus
Issue Date
2017
Journal Title
MATERIALS
ISSN
1996-1944JCR Link
Citation
vol. 10, no. 11
Keywords
Bi2Te3thermoelectric propertiesdoping
Publisher
MDPI AG
Indexed
SCIE; SCOPUS WOS scopus
Abstract
In order to understand the effect of Pb-CuI co-doping on the thermoelectric performance of Bi2Te3, n-type Bi2Te3 co-doped with x at % CuI and 1/2x at % Pb (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.10) were prepared via high temperature solid state reaction and consolidated using spark plasma sintering. Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, Hall mobility, Seebeck coefficient, and thermal conductivity, of CuI-Pb co-doped Bi2Te3 were measured in the temperature range from 300 K to 523 K, and compared to corresponding x% of CuI-doped Bi2Te3 and undoped Bi2Te3. The addition of a small amount of Pb significantly decreased the carrier concentration, which could be attributed to the holes from Pb atoms, thus the CuI-Pb co-doped samples show a lower electrical conductivity and a higher Seebeck coefficient when compared to CuI-doped samples with similar x values. The incorporation of Pb into CuI-doped Bi2Te3 rarely changed the power factor because of the trade-off relationship between the electrical conductivity and the Seebeck coefficient. The total thermal conductivity((tot)) of co-doped samples ((tot) similar to 1.4 W/m.K at 300 K) is slightly lower than that of 1% CuI-doped Bi2Te3 ((tot) similar to 1.5 W/m.K at 300 K) and undoped Bi2Te3 ((tot) similar to 1.6 W/m.K at 300 K) due to the alloy scattering. The 1% CuI-Pb co-doped Bi2Te3 sample shows the highest ZT value of 0.96 at 370 K. All data on electrical and thermal transport properties suggest that the thermoelectric properties of Bi2Te3 and its operating temperature can be controlled by co-doping.
DOI
10.3390/ma10111235
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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