High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials

Rachel J. Korkosz, Thomas C. Chasapis, Shih Han Lo, Jeff W. Doak, Yoon Jun Kim, Chun I. Wu, Euripidis Hatzikraniotis, Timothy P. Hogan, David N. Seidman, Chris Wolverton, Vinayak P. Dravid, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

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Abstract

Lead chalcogenide thermoelectric systems have been shown to reach record high figure of merit values via modification of the band structure to increase the power factor or via nanostructuring to reduce the thermal conductivity. Recently, (PbTe)1-x(PbSe)x was reported to reach high power factors via a delayed onset of interband crossing. Conversely, the (PbTe)1-x(PbS)x was reported to achieve low thermal conductivities arising from extensive nanostructuring. Here we report the thermoelectric properties of the pseudoternary 2% Na-doped (PbTe) 1-2x(PbSe)x(PbS)x system. The (PbTe) 1-2x(PbSe)x(PbS)x system is an excellent platform to study phase competition between entropically driven atomic mixing (solid solution behavior) and enthalpy-driven phase separation. We observe that the thermoelectric properties of the PbTe-PbSe-PbS 2% Na doped are superior to those of 2% Na-doped PbTe-PbSe and PbTe-PbS, respectively, achieving a ZT ≈2.0 at 800 K. The material exhibits an increased the power factor by virtue of valence band modification combined with a very reduced lattice thermal conductivity deriving from alloy scattering and point defects. The presence of sulfide ions in the rock-salt structure alters the band structure and creates a plateau in the electrical conductivity and thermopower from 600 to 800 K giving a power factor of 27 μW/cmK2. The very low total thermal conductivity values of 1.1 W/m·K of the x = 0.07 composition is accounted for essentially by phonon scattering from solid solution defects rather than the assistance of endotaxial nanostructures.

Original languageEnglish
Pages (from-to)3225-3227
Number of pages3
JournalJournal of the American Chemical Society
Volume136
Issue number8
DOIs
Publication statusPublished - Feb 26 2014

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Thermal conductivity
Thermal Conductivity
Band structure
Solid solutions
Phonon scattering
Thermoelectric power
Point defects
Valence bands
Crystal lattices
Phase separation
Enthalpy
Nanostructures
Lead
Phonons
Rocks
Scattering
Salts
Electric Conductivity
Defects
lead selenide

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Korkosz, R. J., Chasapis, T. C., Lo, S. H., Doak, J. W., Kim, Y. J., Wu, C. I., ... Kanatzidis, M. G. (2014). High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials. Journal of the American Chemical Society, 136(8), 3225-3227. https://doi.org/10.1021/ja4121583

High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials. / Korkosz, Rachel J.; Chasapis, Thomas C.; Lo, Shih Han; Doak, Jeff W.; Kim, Yoon Jun; Wu, Chun I.; Hatzikraniotis, Euripidis; Hogan, Timothy P.; Seidman, David N.; Wolverton, Chris; Dravid, Vinayak P.; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 136, No. 8, 26.02.2014, p. 3225-3227.

Research output: Contribution to journalArticle

Korkosz, RJ, Chasapis, TC, Lo, SH, Doak, JW, Kim, YJ, Wu, CI, Hatzikraniotis, E, Hogan, TP, Seidman, DN, Wolverton, C, Dravid, VP & Kanatzidis, MG 2014, 'High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials', Journal of the American Chemical Society, vol. 136, no. 8, pp. 3225-3227. https://doi.org/10.1021/ja4121583
Korkosz RJ, Chasapis TC, Lo SH, Doak JW, Kim YJ, Wu CI et al. High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials. Journal of the American Chemical Society. 2014 Feb 26;136(8):3225-3227. https://doi.org/10.1021/ja4121583
Korkosz, Rachel J. ; Chasapis, Thomas C. ; Lo, Shih Han ; Doak, Jeff W. ; Kim, Yoon Jun ; Wu, Chun I. ; Hatzikraniotis, Euripidis ; Hogan, Timothy P. ; Seidman, David N. ; Wolverton, Chris ; Dravid, Vinayak P. ; Kanatzidis, Mercouri G. / High ZT in p-type (PbTe)1-2x(PbSe)x(PbS)x thermoelectric materials. In: Journal of the American Chemical Society. 2014 ; Vol. 136, No. 8. pp. 3225-3227.
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