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Unusual n-type thermoelectric properties of Bi2Te3 doped with divalent alkali earth metals

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Title
Unusual n-type thermoelectric properties of Bi2Te3 doped with divalent alkali earth metals
Author(s)
Sejin Byun; Joonil Cha; Zhou C.; Yong Kyu Lee; Hyungseok Lee; Park S.H.; Lee W.B.; In Chung
Publication Date
2019-01
Journal
JOURNAL OF SOLID STATE CHEMISTRY, v.269, no., pp.396 - 400
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Abstract
Bi2Te3-based materials are a representative thermoelectric system operating near ambient temperature. Their n-type family is very limited and underperforms the p-type counterpart, which is a major concern in the thermoelectric community. Here we report that alkali earth metals (AE = Mg, Ca, Sr, Ba) in Group 2 unusually induce n-type thermoelectric properties in Bi2Te3. Mg is the most efficient electron donor among them. The x = 0.01 sample of MgxBi2-xTe3 (x = 0.005, 0.01, 0.015) system exhibits remarkably enhanced power factor and ZT of ~0.8 at 350 K in comparison with pristine Bi2Te3. The improved performance is attributed to simultaneously enhanced electrical conductivity and reduced lattice thermal conductivity. Remarkably, MgxBi2-xTe3 materials show larger Seebeck coefficients than those expected by the theoretical Pisarenko relation. C. 2018 Elsevier Inc
URI
https://pr.ibs.re.kr/handle/8788114/6946
ISSN
0022-4596
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Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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