Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms
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....
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doaj-66bd040d7f1d49a0a6e1f4c3c804d17f2020-11-25T00:15:36ZengMDPI AGMaterials1996-19442017-10-011011123510.3390/ma10111235ma10111235Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb AtomsMi-Kyung Han0Yingshi Jin1Da-Hee Lee2Sung-Jin Kim3Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, KoreaDepartment of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, KoreaDepartment of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, KoreaDepartment of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, KoreaIn 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 Bi2Te3 (κtot ~ 1.5 W/m∙K at 300 K) and undoped Bi2Te3 (κtot ~ 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.https://www.mdpi.com/1996-1944/10/11/1235Bi2Te3thermoelectric propertiesdoping |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mi-Kyung Han Yingshi Jin Da-Hee Lee Sung-Jin Kim |
spellingShingle |
Mi-Kyung Han Yingshi Jin Da-Hee Lee Sung-Jin Kim Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms Materials Bi2Te3 thermoelectric properties doping |
author_facet |
Mi-Kyung Han Yingshi Jin Da-Hee Lee Sung-Jin Kim |
author_sort |
Mi-Kyung Han |
title |
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms |
title_short |
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms |
title_full |
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms |
title_fullStr |
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms |
title_full_unstemmed |
Thermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms |
title_sort |
thermoelectric properties of bi2te3: cui and the effect of its doping with pb atoms |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2017-10-01 |
description |
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 Bi2Te3 (κtot ~ 1.5 W/m∙K at 300 K) and undoped Bi2Te3 (κtot ~ 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. |
topic |
Bi2Te3 thermoelectric properties doping |
url |
https://www.mdpi.com/1996-1944/10/11/1235 |
work_keys_str_mv |
AT mikyunghan thermoelectricpropertiesofbi2te3cuiandtheeffectofitsdopingwithpbatoms AT yingshijin thermoelectricpropertiesofbi2te3cuiandtheeffectofitsdopingwithpbatoms AT daheelee thermoelectricpropertiesofbi2te3cuiandtheeffectofitsdopingwithpbatoms AT sungjinkim thermoelectricpropertiesofbi2te3cuiandtheeffectofitsdopingwithpbatoms |
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