High-temperature charge and thermal transport properties of the n-type thermoelectric material PbSe

John Androulakis, Duck Young Chung, Xianli Su, Li Zhang, Ctirad Uher, Thomas C. Hasapis, Euripides Hatzikraniotis, Konstantinos M. Paraskevopoulos, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We present a detailed study of the charge transport, infrared optical reflectivity, and thermal transport properties of n-type PbSe crystals. A strong scattering, mobility-limiting mechanism was revealed to be at play at temperatures above 500 K. The mechanism is indicative of complex electron-phonon interactions that cannot be explained by conventional acoustic phonon scattering alone. We applied the first-order nonparabolicity approximation to extract the density-of-states effective mass as a function of doping both at room temperature and at 700 K. The results are compared to those of a parabolic band model and in light of doping-dependent studies of the infrared optical reflectivity. The thermal conductivity behavior as a function of temperature shows a strong deviation from the expected Debye-Peierls high-temperature behavior (umklapp dominated) indicating an additional heat-carrying channel, which we associate with optical phonon excitations. The correlation of the thermal conductivity observations to the high-temperature carrier mobility behavior is discussed. The thermoelectric figure of merit exhibits a promising value of ∼ 0.8 at 700 K at ∼1.5×1019 cm-3.

Original languageEnglish
Article number155207
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number15
DOIs
Publication statusPublished - Oct 18 2011

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thermoelectric materials
Transport properties
transport properties
thermal conductivity
reflectance
electron phonon interactions
carrier mobility
Thermal conductivity
scattering
figure of merit
Temperature
Doping (additives)
Infrared radiation
Electron-phonon interactions
Phonon scattering
Carrier mobility
deviation
heat
temperature
acoustics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

High-temperature charge and thermal transport properties of the n-type thermoelectric material PbSe. / Androulakis, John; Chung, Duck Young; Su, Xianli; Zhang, Li; Uher, Ctirad; Hasapis, Thomas C.; Hatzikraniotis, Euripides; Paraskevopoulos, Konstantinos M.; Kanatzidis, Mercouri G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 15, 155207, 18.10.2011.

Research output: Contribution to journalArticle

Androulakis, John ; Chung, Duck Young ; Su, Xianli ; Zhang, Li ; Uher, Ctirad ; Hasapis, Thomas C. ; Hatzikraniotis, Euripides ; Paraskevopoulos, Konstantinos M. ; Kanatzidis, Mercouri G. / High-temperature charge and thermal transport properties of the n-type thermoelectric material PbSe. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 84, No. 15.
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