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Single parabolic band transport in p-type EuZn2Sb2 thermoelectrics

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Abstract

Zintl compounds are usually rich in composition and thus enable a large degree of manipulation in both electronic and phononic properties for potential thermoelectric applications. This is typified by the AB2C2 compounds (A = Eu, Yb, Ba, Ca; B = Zn, Cd, Mg and C = As, Sb, Bi) that have attracted extensive attention. Among this class of compounds, a few existing works indicate that the high thermoelectric performance in p-type EuZn2Sb2 relies on its relatively high mobility and the reported figures of merit are scattered. This has motivated this study to focus on the thermoelectric transport properties of p-EuZn2−xAgxSb2 (Ag-doped) in a broad carrier concentration range (3.5–14 × 1019 cm−3), which reveals a single parabolic band (SPB) behavior in this material and enables insights into the fundamental material parameters determining the thermoelectric performance. This finding has guided a further enhancement to be achieved by a reduction in the lattice thermal conductivity, which is realized by a strong phonon scattering through the Ca/Eu isovalent substitutional defects. The achieved peak figure of merit, zT, was as high as unity, demonstrating EuZn2Sb2 as a promising thermoelectric material.

Graphical abstract: Single parabolic band transport in p-type EuZn2Sb2 thermoelectrics

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Publication details

The article was received on 09 Oct 2017, accepted on 07 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08869H
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Single parabolic band transport in p-type EuZn2Sb2 thermoelectrics

    X. Wang, W. Li, C. Wang, J. Li, X. Zhang, B. Zhou, Y. Chen and Y. Pei, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA08869H

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