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Materials 2017, 10(11), 1235; https://doi.org/10.3390/ma10111235

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

Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
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Received: 2 October 2017 / Revised: 18 October 2017 / Accepted: 20 October 2017 / Published: 26 October 2017
(This article belongs to the Section Advanced Composites)
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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(κtot) of co-doped samples (κtot ~ 1.4 W/m∙K at 300 K) is slightly lower than that of 1% CuI-doped Bi2Te3tot ~ 1.5 W/m∙K at 300 K) and undoped Bi2Te3tot ~ 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. View Full-Text
Keywords: Bi2Te3; thermoelectric properties; doping Bi2Te3; thermoelectric properties; doping
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Han, M.-K.; Jin, Y.; Lee, D.-H.; Kim, S.-J. Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms. Materials 2017, 10, 1235.

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