High thermoelectric figure of merit ZT in PbTe and Bi2Te3-based superlattices by a reduction of the thermal conductivity

Beyer, H.; Nurnus, J.; Böttner, H.; Lambrecht, A.; Wagner, Elmar; Bauer, G.

doi:10.1016/s1386-9477(02)00246-1

Cited by 96 publications

(59 citation statements)

References 12 publications

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“…Furthermore L ⊥ is larger than the metallic limit L 0 . Very often values of L ⊥ ∼ 0.5 − 0.6 [12,30] are assumed for the experimental determination of κ el,⊥ in Bi 2 Te 3 /Sb 2 Te 3 SLs. In turn, this most probably leads to an underestimation of the electrical contribution to total thermal conductivity in cross-plane direction.…”

Section: Resultsmentioning

confidence: 99%

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Hinsche

Mertig

Zahn

2012

Journal of Elec Materi

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Combining first principles density functional theory and semi-classical Boltzmann transport, the anisotropic Lorenz function was studied for thermoelectric Bi 2 Te 3 /Sb 2 Te 3 superlattices and their bulk constituents. It was found that already for the bulk materials Bi 2 Te 3 and Sb 2 Te 3 , the Lorenz function is not a pellucid function on charge carrier concentration and temperature. For electron-doped Bi 2 Te 3 /Sb 2 Te 3 superlattices large oscillatory deviations for the Lorenz function from the metallic limit were found even at high charge carrier concentrations. The latter can be referred to quantum well effects, which occur at distinct superlattice periods.

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Section: Resultsmentioning

confidence: 99%

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Hinsche

Mertig

Zahn

2012

Journal of Elec Materi

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“…It suggests that cross-plane transport along the direction perpendicular to the artificial interfaces of the SL reduces phonon heat conduction while maintaining or even enhancing the electron transport 3 . While some effort in experimental research was done [8][9][10][11][12][13] , only a few theoretical works discuss the possible transport across such SL structures 14,15 . While Park et al 14 discussed the effect of volume change on the in-plane thermoelectric transport properties of Bi 2 Te 3 , Sb 2 Te 3 and their related compound, Li et al 15 focussed on the calculation of the electronic structure for a Bi 2 Te 3 /Sb 2 Te 3 -SL, stating changes of the mobility anisotropy estimated from effective masses.…”

Section: Introductionmentioning

confidence: 99%

Influence of strain on anisotropic thermoelectric transport in Bi2Te3and Sb2Te
Hinsche
¹
,
Yavorsky
²
,
Mertig
³

et al. 2011
Phys. Rev. B

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On the basis of detailed first-principles calculations and semi-classical Boltzmann transport, the anisotropic thermoelectric transport properties of Bi2Te3 and Sb2Te3 under strain were investigated. It was found that due to compensation effects of the strain dependent thermopower and electrical conductivity, the related powerfactor will decrease under applied in-plane strain for Bi2Te3, while being stable for Sb2Te3. A clear preference for thermoelectric transport under hole-doping, as well as for the in-plane transport direction was found for both tellurides. In contrast to the electrical conductivity anisotropy, the anisotropy of the thermopower was almost robust under applied strain. The assumption of an anisotropic relaxation time for Bi2Te3 suggests, that already in the single crystalline system strong anisotropic scattering effects should play a role.

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“…Lead telluride is a narrow gap semiconductor that finds applications in thermoelectric devices [1][2][3] and in infrared lasers 4,5 and detectors. 6,7 The molecular beam epitaxial ͑MBE͒ technique has been successfully applied to grow high-quality thin films and heterostructures of PbTe-based alloys.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 The molecular beam epitaxial ͑MBE͒ technique has been successfully applied to grow high-quality thin films and heterostructures of PbTe-based alloys. [8][9][10] Highly doped layers ͑Ͼ10 19 cm −3 ͒ are required to increase the impedance-temperature ͑ZT͒ figure of merit in thermoelectric devices 3 and to minimize electrical losses in lasers. 4 In addition, the doping control to produce a wide range of free carrier densities is very interesting for optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of PbTe doped with BaF2

Mengui

Abramof

Rappl

et al. 2009

Journal of Applied Physics

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We study here the p-type doping of PbTe with BaF2. For the investigation, PbTe layers were grown on (111) BaF2 substrates by molecular beam epitaxy. The beam flux ratio between BaF2 and PbTe, defined as the nominal doping level, was varied from 0.02% to 1%. The hole density increases from 5×1017 to 1×1019 cm−3 as the doping level rises from 0.02% to 0.4% and saturates at p∼1019 cm−3 for higher levels. The saturation effect was attributed to self-compensation. The carrier concentration of all samples remained almost constant as the temperature was varied from 10 to 350 K, indicating that no thermal activation is present in the whole doping range. It suggests that the impurity level in PbTe doped with BaF2 remains resonant with the valence band, similar to the native defects behavior. The low-temperature mobility showed a pronounced reduction from 50 000 to 2 000 cm2/V s as the doping level rises from 0.02% to 1%, mainly due to the substantial increase in the hole concentration. For temperatures higher than 80 K, the mobility was essentially limited by phonon scattering. Our results demonstrate that a controlled p-type doping of PbTe with BaF2 can be obtained up to 1019 cm−3.

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High thermoelectric figure of merit ZT in PbTe and Bi2Te3-based superlattices by a reduction of the thermal conductivity

Cited by 96 publications

References 12 publications

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Influence of strain on anisotropic thermoelectric transport in Bi2Te3and Sb2Te
Hinsche
¹
,
Yavorsky
²
,
Mertig
³

et al. 2011
Phys. Rev. B

Electrical properties of PbTe doped with BaF2

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High thermoelectric figure of merit ZT in PbTe and Bi2Te3-based superlattices by a reduction of the thermal conductivity

Cited by 96 publications

References 12 publications

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Lorenz Function of Bi2Te3/Sb2Te3 Superlattices

Influence of strain on anisotropic thermoelectric transport in Bi2Te3and Sb2TeHinsche1, Yavorsky2, Mertig3 et al. 2011Phys. Rev. B

Electrical properties of PbTe doped with BaF2

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Influence of strain on anisotropic thermoelectric transport in Bi2Te3and Sb2Te
Hinsche
¹
,
Yavorsky
²
,
Mertig
³

et al. 2011
Phys. Rev. B