High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation

Dianta Ginting, Chan Chieh Lin, R. Lydia, Hyeon Seob So, Hosun Lee, Junpil Hwang, Woochul Kim, Rabih Al Rahal Al Orabi, Jong Soo Rhyee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Lead chalcogenides have long been studied as promising thermoelectric materials, operating at the mid-temperature range of 500–950 K. Here, we studied thermoelectric properties of pseudo-quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 (x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.35, and 0.95) with 1% Na-doping, synthesized by melting and rapid quenching of pristine compounds of PbTe, PbSe, and PbS and followed by hot press sintering. The lattice parameters and transmission electron microscopy confirmed that the PbSe makes solid solution with PbTe leading to PbTe1-xSex matrix while the PbS precipitates in the matrix. In terms of two valence bands model, the energy band gap between conduction and valence L-band was decreased and the energy difference between L- and Σ-bands was increased with increasing Se concentration. The band convergence at high temperature may be associated with the enhancement of power factor. The PbS nano-scale precipitation in the matrix attributed to the decrease of lattice thermal conductivity. From the Matthiessen's rule, the lattice thermal conductivity was described by the nano precipitation as well as alloy scattering of phonons. The simultaneous emergence of band convergence and nano-precipitation in the quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 gives rise to exceptionally high zT value of 2.3 at 800 K for x = 0.20. The high zT value also showed enhancement of practical thermoelectric performances such as engineering zTeng, device efficiency η, output power density Pd, and device zTd. In addition, high zT compounds have good compatibility with the n-type I-doped PbTe compound, which can be applied to practical waste heat power generation.

Original languageEnglish
Pages (from-to)98-109
Number of pages12
JournalActa Materialia
Volume131
DOIs
Publication statusPublished - 2017 Jun 1

Fingerprint

Thermal conductivity
Rapid quenching
Chalcogenides
Waste heat
Phonons
Valence bands
Band structure
Lattice constants
Power generation
Precipitates
Solid solutions
Melting
Energy gap
Sintering
Lead
Doping (additives)
Scattering
Transmission electron microscopy
Temperature
lead selenide

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Ginting, Dianta ; Lin, Chan Chieh ; Lydia, R. ; So, Hyeon Seob ; Lee, Hosun ; Hwang, Junpil ; Kim, Woochul ; Al Rahal Al Orabi, Rabih ; Rhyee, Jong Soo. / High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation. In: Acta Materialia. 2017 ; Vol. 131. pp. 98-109.
@article{97c3d841969c4699aead73a9f413b7f4,
title = "High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation",
abstract = "Lead chalcogenides have long been studied as promising thermoelectric materials, operating at the mid-temperature range of 500–950 K. Here, we studied thermoelectric properties of pseudo-quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 (x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.35, and 0.95) with 1{\%} Na-doping, synthesized by melting and rapid quenching of pristine compounds of PbTe, PbSe, and PbS and followed by hot press sintering. The lattice parameters and transmission electron microscopy confirmed that the PbSe makes solid solution with PbTe leading to PbTe1-xSex matrix while the PbS precipitates in the matrix. In terms of two valence bands model, the energy band gap between conduction and valence L-band was decreased and the energy difference between L- and Σ-bands was increased with increasing Se concentration. The band convergence at high temperature may be associated with the enhancement of power factor. The PbS nano-scale precipitation in the matrix attributed to the decrease of lattice thermal conductivity. From the Matthiessen's rule, the lattice thermal conductivity was described by the nano precipitation as well as alloy scattering of phonons. The simultaneous emergence of band convergence and nano-precipitation in the quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 gives rise to exceptionally high zT value of 2.3 at 800 K for x = 0.20. The high zT value also showed enhancement of practical thermoelectric performances such as engineering zTeng, device efficiency η, output power density Pd, and device zTd. In addition, high zT compounds have good compatibility with the n-type I-doped PbTe compound, which can be applied to practical waste heat power generation.",
author = "Dianta Ginting and Lin, {Chan Chieh} and R. Lydia and So, {Hyeon Seob} and Hosun Lee and Junpil Hwang and Woochul Kim and {Al Rahal Al Orabi}, Rabih and Rhyee, {Jong Soo}",
year = "2017",
month = "6",
day = "1",
doi = "10.1016/j.actamat.2017.03.036",
language = "English",
volume = "131",
pages = "98--109",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",

}

High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation. / Ginting, Dianta; Lin, Chan Chieh; Lydia, R.; So, Hyeon Seob; Lee, Hosun; Hwang, Junpil; Kim, Woochul; Al Rahal Al Orabi, Rabih; Rhyee, Jong Soo.

In: Acta Materialia, Vol. 131, 01.06.2017, p. 98-109.

Research output: Contribution to journalArticle

TY - JOUR

T1 - High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation

AU - Ginting, Dianta

AU - Lin, Chan Chieh

AU - Lydia, R.

AU - So, Hyeon Seob

AU - Lee, Hosun

AU - Hwang, Junpil

AU - Kim, Woochul

AU - Al Rahal Al Orabi, Rabih

AU - Rhyee, Jong Soo

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Lead chalcogenides have long been studied as promising thermoelectric materials, operating at the mid-temperature range of 500–950 K. Here, we studied thermoelectric properties of pseudo-quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 (x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.35, and 0.95) with 1% Na-doping, synthesized by melting and rapid quenching of pristine compounds of PbTe, PbSe, and PbS and followed by hot press sintering. The lattice parameters and transmission electron microscopy confirmed that the PbSe makes solid solution with PbTe leading to PbTe1-xSex matrix while the PbS precipitates in the matrix. In terms of two valence bands model, the energy band gap between conduction and valence L-band was decreased and the energy difference between L- and Σ-bands was increased with increasing Se concentration. The band convergence at high temperature may be associated with the enhancement of power factor. The PbS nano-scale precipitation in the matrix attributed to the decrease of lattice thermal conductivity. From the Matthiessen's rule, the lattice thermal conductivity was described by the nano precipitation as well as alloy scattering of phonons. The simultaneous emergence of band convergence and nano-precipitation in the quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 gives rise to exceptionally high zT value of 2.3 at 800 K for x = 0.20. The high zT value also showed enhancement of practical thermoelectric performances such as engineering zTeng, device efficiency η, output power density Pd, and device zTd. In addition, high zT compounds have good compatibility with the n-type I-doped PbTe compound, which can be applied to practical waste heat power generation.

AB - Lead chalcogenides have long been studied as promising thermoelectric materials, operating at the mid-temperature range of 500–950 K. Here, we studied thermoelectric properties of pseudo-quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 (x = 0.0, 0.05, 0.10, 0.15, 0.20, 0.35, and 0.95) with 1% Na-doping, synthesized by melting and rapid quenching of pristine compounds of PbTe, PbSe, and PbS and followed by hot press sintering. The lattice parameters and transmission electron microscopy confirmed that the PbSe makes solid solution with PbTe leading to PbTe1-xSex matrix while the PbS precipitates in the matrix. In terms of two valence bands model, the energy band gap between conduction and valence L-band was decreased and the energy difference between L- and Σ-bands was increased with increasing Se concentration. The band convergence at high temperature may be associated with the enhancement of power factor. The PbS nano-scale precipitation in the matrix attributed to the decrease of lattice thermal conductivity. From the Matthiessen's rule, the lattice thermal conductivity was described by the nano precipitation as well as alloy scattering of phonons. The simultaneous emergence of band convergence and nano-precipitation in the quaternary compounds of (PbTe)0.95−x(PbSe)x(PbS)0.05 gives rise to exceptionally high zT value of 2.3 at 800 K for x = 0.20. The high zT value also showed enhancement of practical thermoelectric performances such as engineering zTeng, device efficiency η, output power density Pd, and device zTd. In addition, high zT compounds have good compatibility with the n-type I-doped PbTe compound, which can be applied to practical waste heat power generation.

UR - http://www.scopus.com/inward/record.url?scp=85017344682&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017344682&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2017.03.036

DO - 10.1016/j.actamat.2017.03.036

M3 - Article

VL - 131

SP - 98

EP - 109

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -