Single parabolic band transport in p-type EuZn2Sb2 thermoelectrics,Journal of Materials Chemistry A

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Single parabolic band transport in p-type EuZn2Sb2 thermoelectrics
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7ta08869h
Xiao Wang _{1,

2,

3,

4,

5} , Wen Li _{1,

2,

3,

4,

5} , Chen Wang _{5,

6,

7,

8} , Juan Li _{1,

2,

3,

4,

5} , Xinyue Zhang _{1,

2,

3,

4,

5} , Binqiang Zhou _{1,

2,

3,

4,

5} , Yue Chen _{5,

6,

7,

8} , Yanzhong Pei _{1,

2,

3,

4,

5}

Affiliation

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-EuZn_2−xAg_xSb₂ (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.

中文翻译：

p型EuZn ₂ Sb ₂热电器件中的单抛物线能带传输

Zintl化合物通常成分丰富，因此可以在潜在的热电应用中对电子和声子性能进行较大程度的控制。这以引起广泛关注的AB ₂ C ₂化合物（A = Eu，Yb，Ba，Ca； B = Zn，Cd，Mg和C = As，Sb，Bi）为代表。在这类化合物中，已有的一些工作表明，p型EuZn ₂ Sb ₂的高热电性能取决于其相对较高的迁移率，并且所报告的优异品质是分散的。这促使本研究着重于p-EuZn _{2− x} Ag _x Sb ₂的热电输运性质。（Ag掺杂）在较宽的载流子浓度范围（3.5–14×10 ¹⁹ cm ^-3）中，揭示了该材料中的单个抛物线（SPB）行为，并能够洞悉确定热电性能的基本材料参数。该发现指导了通过降低晶格热导率来实现的进一步增强，这是通过穿过Ca / Eu等价取代缺陷的强声子散射来实现的。所达到的峰值品质因数zT高达1，表明EuZn ₂ Sb ₂是一种有前途的热电材料。

更新日期：2017-11-16

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