Thermoelectric efficiency of intermetallic compound ZnSb

Fedorov, M. I.; Prokofieva, L. V.; Ravich, Yu. I.; Константинов, П. П.; Pshenay-Severin, D. A.; Shabaldin, A. A.

doi:10.1134/s1063782614040095

Cited by 23 publications

(27 citation statements)

References 5 publications

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“…This was suggested by Schneider by the observation of a sharp increase in the electrical conductivity on a temporary n-type and following n-type to p-type transition [71]. On a similar topic, though with different statements, Fedorov et al rationalized the difficulty in doping ZnSb ntype by the formation of an impurity band close to the conduction band [21].…”

Section: Effect Upon Seebeck-effective Density Of States Massmentioning

confidence: 93%

“…Presently, one cannot make a conclusion about the importance of oxygen in this context and the solid solubility of oxygen is unknown. Fedorov et al observed evidence for impurity levels in the band gap associated with different combinations of group I (Ag or Cu) and group IV (Sn or Ge) acceptor elements, which all were similar to each other, but different to those of the single acceptor element [21]. Temperature-dependent transport coefficients were also measured that were interpreted as a temperature-dependent energy state being present with a level in the valence band.…”

Section: Thermoelectrics For Power Generation -A Look At Trends In Thmentioning

confidence: 99%

“…It was suggested that two different doping mechanisms are effective in different temperature ranges involving different intrinsic defects, Sn on different lattice sites and their variation with temperature [68]. have been reported by co-doping of group I (0.15at.% Cu or Ag)/IV (0.6at.% Pb, Sn, or Ge)/Cd [20,21]. The measured transport coefficients at different regions indicate two types of impurity acceptor: one embedded into Zn sites, and another into Sb sites.…”

Section: Doping Effectsmentioning

confidence: 99%

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Review of Research on the Thermoelectric Material ZnSb

Song¹,

Finstad²

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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The thermoelectric material ZnSb has been studied intensively in recent years and has shown promising features. The other zinc-antimonide compound, Zn 4 Sb 3 has remarkable low thermal conductivity, but it is accompanied with phase transitions at moderate temperature and has inherent stability problems. Compared to that, ZnSb is relatively phase stable and has a relative high charge carrier mobility and Seebeck coefficient, thus yielding a decent power factor. Meanwhile, its thermal conductivity can be reduced by means of nanostructuring, thus giving a good figure of merit at moderate temperatures, 400-600K. Many researchers have dedicated their efforts to study and improve ZnSb properties, and the figure of merit has been reported to be above one. Still, ZnSb as a thermoelectric material has features and behaviours that are not well-understood. The behaviour and properties of its intrinsic defects are not understood, but have interested researchers in recent years. This chapter intends to offer a comprehensive review on ZnSb to the readers. By combining own experiences from research on thermoelectric materials, the authors address the prospect for improving the thermoelectric properties of ZnSb and the concerns of transferring lab results to manufacturing.

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Section: Effect Upon Seebeck-effective Density Of States Massmentioning

confidence: 93%

Section: Thermoelectrics For Power Generation -A Look At Trends In Thmentioning

confidence: 99%

Section: Doping Effectsmentioning

confidence: 99%

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Review of Research on the Thermoelectric Material ZnSb

Song¹,

Finstad²

2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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“…Unlike other state-of-the-art thermoelectric materials, zinc antimonides consist of neither toxic nor expensive elements [6]. Among several zinc antimonides compositions, ZnSb exhibits a good power factor while the thermal conductivity can be lowered by nanostructuring, giving it promising thermoelectric properties [5,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Zn vacancy formation, Zn evaporation and decomposition of ZnSb at elevated temperatures: Influence on the microstructure and the electrical properties

Song

Schrade

Masó

et al. 2017

Journal of Alloys and Compounds

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The influence of annealing on the microstructure and electrical properties of undoped polycrystalline ZnSb samples has been investigated by different experimental techniques. In situ XRD in an argon atmosphere showed that ZnSb powders decompose at 300 °C, which is attributed to Zn evaporation. In situ SEM in a moist atmosphere showed fast surface deterioration at 450 °C and above, reflecting decomposition of ZnSb and the formation of metallic Sb precipitates. The rate of Zn loss in a reducing atmosphere was determined by thermogravimetry and related to the Zn partial vapor pressure. The increase of the hole carrier concentration of ZnSb measured at room temperature after heat treatment was correlated with Zn evaporation at elevated temperature. The carrier concentration after annealing at 400 °C is consistent with an activation energy for Zn vacancy formation of 0.4 eV and a maximum Zn deficiency x of Zn 1-x Sb of 1 × 10-3 .

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“…24,25 Several reports on densely packed pellets of ZnSb have appeared recently, utilizing techniques like ball-milling, [26][27][28][29][30] spark plasma sintering, 31 and cryogenic milling. 32 Optimization of doping levels and alloying elements have significantly enhanced the thermoelectric properties of ZnSb, 22,27,33,34 0021-8979/2016/119(12)/125103/10/$30.00…”

Section: Introductionmentioning

confidence: 99%

Enhancement of thermoelectric properties by energy filtering: Theoretical potential and experimental reality in nanostructured ZnSb

Berland

Song

Carvalho

et al. 2016

Journal of Applied Physics

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Energy filtering has been suggested by many authors as a means to improve thermoelectric properties. The idea is to filter away low-energy charge carriers in order to increase Seebeck coefficient without compromising electronic conductivity. This concept was investigated in the present paper for a specific material (ZnSb) by a combination of first-principles atomic-scale calculations, Boltzmann transport theory, and experimental studies of the same system. The potential of filtering in this material was first quantified, and it was as an example found that the power factor could be enhanced by an order of magnitude when the filter barrier height was 0.5 eV. Measured values of the Hall carrier concentration in bulk ZnSb were then used to calibrate the transport calculations, and nanostructured ZnSb with average grain size around 70 nm was processed to achieve filtering as suggested previously in the literature. Various scattering mechanisms were employed in the transport calculations and compared with the measured transport properties in nanostructured ZnSb as a function of temperature. Reasonable correspondence between theory and experiment could be achieved when a combination of constant lifetime scattering and energy filtering with a 0.25 eV barrier was employed. However, the difference between bulk and nanostructured samples was not sufficient to justify the introduction of an energy filtering mechanism. The reasons for this and possibilities to achieve filtering were discussed in the paper.

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Thermoelectric efficiency of intermetallic compound ZnSb

Cited by 23 publications

References 5 publications

Review of Research on the Thermoelectric Material ZnSb

Review of Research on the Thermoelectric Material ZnSb

Zn vacancy formation, Zn evaporation and decomposition of ZnSb at elevated temperatures: Influence on the microstructure and the electrical properties

Enhancement of thermoelectric properties by energy filtering: Theoretical potential and experimental reality in nanostructured ZnSb

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