Combining alloy scattering of phonons and resonant electronic levels to reach a high thermoelectric figure of merit in PbTeSe and PbTeS alloys

Jaworski, Christopher M.; Wiendlocha, Bartłomiej; Jovovic, Vladimir; Heremans, Joseph P.

doi:10.1039/c1ee01895g

Cited by 122 publications

(119 citation statements)

References 30 publications

(29 reference statements)

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“…The Tl levels in PbTe are known to be due to 6s-Tl levels coupled with neighboring Te p-electrons. 8 Note that in references [1] and [2], data are shown on the Pisarenko plot are plotted for different hole concentrations, which implies ipso facto that these holes were mobile enough to contribute to the Hall and thus Seebeck coefficients. By the same reasoning, Tl in PbTe and Sn in Bi 2 Te 3 do not show Fermi-level self-pinning, although the Tl level in PbTe does pin holes that come from double-doping.…”

Section: Discussionmentioning

confidence: 99%

Titanium forms a resonant level in the conduction band of PbTe

König¹,

Nielsen²,

Gao³

et al. 2011

Phys. Rev. B

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Titanium is a donor in PbTe, leading to electron concentrations up to n ∼ 1x10 19 cm -3 , above which it pins the Fermi level at about 52 meV above the conduction band edge. While Ti is thus a resonant level, it does not enhance the thermopower above that of similarly-doped PbTe, suggesting that the electrons on Ti are localized.Delocalized electrons appear again when the Ti concentration is increased so that 1x10 19 cm -3

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Section: Discussionmentioning

confidence: 99%

Titanium forms a resonant level in the conduction band of PbTe

König¹,

Nielsen²,

Gao³

et al. 2011

Phys. Rev. B

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“…The overall shape of DOS for pure-PbTe (x ¼ 0) is consistent with the previous results. 8,22,29,33 Apparently, there is no significant difference in DOS between pure-PbTe (x ¼ 0) and dilute doped-PbTe (x ¼ 0.0001) for both La-and I-doped PbTe. For undoped PbTe, strong hybridization between Te and Pb p-states contributes dominantly to opening the bandgap.…”

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confidence: 99%

“…We performed calculations using the Korringa-Kohn-Rostoker Green function formalism under the coherent potential approximation (KKR-CPA) [26][27][28] for randomly disordered La x Pb 1Àx Te and PbTe 1Àx I x . KKR-CPA calculations have been applied in PbTe-systems, 8,22,29 but there is no report on the comparison with E g and m* for different n-type dopants in PbTe. Here, we focus on the changes of E g and m* by observing changes in DOS with changing doping concentration.…”

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confidence: 99%

Dopants effect on the band structure of PbTe thermoelectric material

et al. 2012

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Spectroscopy of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) attached to rare gas samples: Clusters vs. bulk matrices. II. Fluorescence emission spectroscopy J. Chem. Phys. 137, 164302 (2012) Structural transitions and unusual magnetic behavior in Mn-doped Bi1−xLaxFeO3 perovskites J. Appl. Phys. 112, 084102 (2012) In-situ synchrotron energy-dispersive x-ray diffraction study of thin Pd foils with Pd:D and Pd:H concentrations up to 1:1 J. Appl. Phys. 112, 083510 (2012) Atomic-scaled investigation of structure-dependent luminescence in Sialon:Ce phosphors

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“…4,38 Further alloying of PbSe 0.1 Te 0.9 with sulphur reduces the lattice thermal conductivity even further. As discussed in a previous study, 39 replacing matrix atoms with solid solution atoms with the largest mass contrast can introduce considerable thermal conductivity reduction into the solid solution alloy.…”

Section: (See Esi †)mentioning

confidence: 99%

Chemical composition tuning in quaternary p-type Pb-chalcogenides – a promising strategy for enhanced thermoelectric performance

Yamini

Wang

Gibbs

et al. 2014

Phys. Chem. Chem. Phys.

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Recently a significant improvement in the thermoelectric performance of p-type ternary PbTe-PbSe and PbTe-PbS systems has been realized through alternating the electronic band structure and introducing nano-scale precipitates to bulk materials respectively. However, the quaternary system of PbTe-PbSe-PbS has received less attention. In the current work, we have excluded phase complexity by fabricating single phase sodium doped PbTe, alloyed with PbS up to its solubility limit which is extended to larger concentrations than in the ternary system of PbTe-PbS due to the presence of PbSe. We have presented a thermoelectric efficiency of approximately 1.6 which is superior to ternary PbTe-PbSe and PbTe-PbS at similar carrier concentrations and the binary PbTe, PbSe and PbS alloys. The quaternary system shows a larger Seebeck coefficient than the ternary PbTe-PbSe alloy, indicative of a wider band gap, valence band energy offset and heavier carriers effective mass. In addition, the existence of PbS in the alloy further reduces the lattice thermal conductivity originated from phonon scattering on solute atoms with high contrast atomic mass. Single phase quaternary PbTe-PbSe-PbS alloys are promising thermoelectric materials that provide high performance through adjusting the electronic band structure by regulating chemical composition.

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Combining alloy scattering of phonons and resonant electronic levels to reach a high thermoelectric figure of merit in PbTeSe and PbTeS alloys

Cited by 122 publications

References 30 publications

Titanium forms a resonant level in the conduction band of PbTe

Titanium forms a resonant level in the conduction band of PbTe

Dopants effect on the band structure of PbTe thermoelectric material

Chemical composition tuning in quaternary p-type Pb-chalcogenides – a promising strategy for enhanced thermoelectric performance

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