Thermoelectric performance of tellurium-reduced quaternary p-type lead–chalcogenide composites

Yamini, Sima Aminorroaya; Wang, Heng; Gibbs, Zachary M.; Pei, Yanzhong; Mitchell, David R. G.; Dou, Shi Xue; Snyder, G. Jeffrey

doi:10.1016/j.actamat.2014.06.065

Cited by 32 publications

(29 citation statements)

References 42 publications

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“…It is also confirmed experimentally for p‐type PbS . The matrix of the current study compound contains both PbSe and PbS . Therefore, it is expected that the heavy valence band would be shifted to lower energy levels as well as light band and provides no extra contribution to the electronic structure at room temperature compared with single phase PbTe.…”

Section: Resultssupporting

confidence: 73%

“…This can be attributed to the scattering of phonons on randomly distributed solute atoms of selenium and sulphur in the matrix and/or scattering from interfaces and defects originating from the distribution of precipitates within the matrix . However, the lattice thermal conductivity of the nanostructured (PbTe) 0.65 (PbS) 0.25 (PbSe) 0.1 compound at high temperature is as low as single phase PbTe and slightly higher than single phase quaternary Pb chalcogenides . Figure c indicates that although the sodium concentration variation in degenerate compounds has reduced the lattice thermal conductivity, the values are still much higher than extraordinarily low lattice thermal conductivity of ≈0.4 W m −1 K reported in potassium doped PbTe 0.7 S 0.3 …”

Section: Resultsmentioning

confidence: 99%

“…Temperature dependent thermoelectric transport properties of sodium‐doped (PbTe) 0.65 (PbS) 0.25 (PbSe) 0.1, sintered bulk samples at various Hall carrier concentrations: a) electrical resistivity (mΩ cm); b) Seebeck coefficient (μV/K); c) measured total thermal conductivity and calculated lattice thermal conductivity, κ (W/m K); and d) the lattice thermal conductivity of heavily doped (PbTe) 0.65 (PbS) 0.25 (PbSe) 0.1 compound compared with heavily Na‐doped (PbTe) 0.9 (PbSe) 0.1 , (PbTe) 0.8 (PbSe) 0.1 (PbS) 0.1 , PbTe, and PbS …”

Section: Resultsmentioning

confidence: 99%

“…Alloying beyond the solubility limit produces no further improvement in the power factor. Due to the formation of precipitates such alloying cannot produce further modification of the band structure . Therefore, the power factor of precipitate‐containing compounds cannot exceed that of single‐phase alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the low lattice thermal conductivity in nanostructured and alloyed bulk thermoelectric materials is counterbalanced by a reduction in Hall carrier mobility caused by strong scattering of charge carriers . The low lattice thermal conductivity obtained by nanostructuring is also more significant at room temperature …”

Section: Introductionmentioning

confidence: 99%

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Heterogeneous Distribution of Sodium for High Thermoelectric Performance of p‐type Multiphase Lead‐Chalcogenides

Yamini

Mitchell

Gibbs

et al. 2015

Advanced Energy Materials

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recovery. [ 1 ] The search for high performance materials has continued to improve the relatively low conversion effi ciency of thermoelectric materials. The effi ciency is defi ned by the dimensionless fi gure of merit, zT = S 2 Tσ /( κ E + κ L ), where, S , σ , T , κ L , and κ E are the Seebeck coeffi cient, electrical conductivity, absolute temperature, and the lattice and electronic components of the thermal conductivity, respectively. Pb chalcogenides have received considerable attention amongst existing thermoelectric materials due to the relatively high thermoelectric conversion effi ciencies for both n-type [ 2 ] and p-type [ 3,4 ] compounds.Intrinsic semiconducting lead chalcogenides (PbQ, Q = Te, Se, S) can be tuned to p-type through substitution of monovalent sodium on the lead sublattice. [ 5,6 ] Although, sodium has been the most viable dopant for lead chalcogenides, [ 3,7,8 ] its solubility limits to ≈2 at% in PbS, [ 9 ] ≈0.9 at% in PbSe, [ 9 ] and a maximum of ≈0.7 at% in PbTe. [ 10 ] The exceptionally high thermoelectric performance of ≈2 has been reported for a 2 at% Na-doped multiphase nanostructured PbTe, [ 4,11,12 ] ≈1.6 for 2 at% Na-doped nanostructured multiphase PbSe [ 13 ] and ≈1.2 for 2.5 at% Nadoped nanostructured multiphase PbS. [ 14 ] However, the mechanisms by which these high thermoelectric effi ciencies have been achieved in multiphase compounds with dopant concentrations above the solubility level of the matrix have not been studied systematically. Little attention has been given to the effect of the inhomogeneous distribution of sodium between the component phases on the thermoelectric properties of multiphase compounds. Here, we have explored the thermoelectric properties of multi phase nanostructured quaternary (PbTe) 0.65 (PbS) 0.25 (PbSe) 0.1 compounds at various Na-dopant concentrations.Strategies aiming to improve the power factor (S 2 σ) through tuning of the electronic band structure near the Fermi level, include resonant states, [ 15,16 ] multiple bands, [ 14,17 ] manipulating the band gap, [18][19][20] and/or modulation doping. [21][22][23] During the last decade, tremendous efforts have also been devoted to reducing the lattice thermal conductivity of bulk thermoelectric materials by nanostructuring. [ 4,8,24 ] Multiphase lead chalcogenides compounds invariably exhibit higher zT values than those of their constituent phases. This is attributed to the combined effects of: band engineering resulting from the effects of alloying; a reduction in the lattice thermal conductivity, which Despite the effectiveness of sodium as a p-type dopant for lead chalcogenides, its solubility is shown to be very limited in these hosts. Here, a high thermoelectric effi ciency of ≈2 over a wide temperature range is reported in multiphase quaternary (PbTe) 0.65 (PbS) 0.25 (PbSe) 0.1 compounds that are doped with sodium at concentrations greater than the solubility limits of the matrix. Although these compounds present room temperature thermoelectric effi ciencies similar to sodium doped PbT...

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Heterogeneous Distribution of Sodium for High Thermoelectric Performance of p‐type Multiphase Lead‐Chalcogenides

Yamini

Mitchell

Gibbs

et al. 2015

Advanced Energy Materials

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Thermoelectric Enhancement of Different Kinds of Metal Chalcogenides

Han

Sun

et al. 2016

Advanced Energy Materials

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173

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Due to the urgency of our energy and environmental issues, a variety of cost-effective and pollution-free technologies have attracted considerable attention, among which thermoelectric technology has made enormous progress. Substantial numbers of new thermoelectric materials are created with high figure of merit (ZT) by using advanced nanoscience and nanotechnology. This is especially true in the case of metalchalcogenide-based materials, which possess both relatively high ZT and low cost among all the different kinds of thermoelectric materials. Here, comprehensive coverage of recent advances in metal chalcogenides and their correlated thermoelectric enhancement mechanisms are provided. Several new strategies are summarized with the hope that they can inspire further enhancement of performance, both in metal chalcogenides and in other materials. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsHan, C., Sun, Q., Li, Z. & Dou, S. X. (2016) Several new strategies are summarized with the hope that they can inspire further enhancement of performance, both in metal chalcogenides and in other materials.2

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