Characterization and analysis of thermoelectric transport using SPB model in nanostructured aluminum doped zinc tellurium

Ankam Bhaskar, Yi Hsuan Pai, Chia-Jyi Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Low-temperature electronic and thermal transport measurements are carried out on nanostructured Zn1-xAlxTe (0 ≤ x ≤ 0.15) fabricated using hydrothermal synthesis followed by evacuated-and-encapsulated sintering. A single parabolic band with acoustic phonon scattering is used to analyze thermoelectric transport data. It is found that reduced Fermi energy gets closer to the valence band edge and density of states effective mass, effective density of states, and Hall factor decrease with increasing x in doped samples. The chemical carrier concentration, carrier density independent mobility, β, and theoretical zT values increase with increasing x in doped samples. The nanostructured Zn1-xAlxTe exhibits significant reduction of thermal conductivity at 300 K (1.82-3.71 W m-1 K-1) as compared to bulk ZnTe (18 W m-1 K-1). The point-defect scattering and phonon-grain scattering play an important role in reducing the lattice thermal conductivity. In addition, partial substitution of Al3+ for Zn2+ significantly improves both the power factor and zT values.

Original languageEnglish
Article number455503
JournalJournal of Physics D: Applied Physics
Volume50
Issue number45
DOIs
Publication statusPublished - 2017 Oct 23

Fingerprint

Tellurium
tellurium
Aluminum
Carrier concentration
Zinc
Thermal conductivity
zinc
Scattering
aluminum
Phonon scattering
Hydrothermal synthesis
Point defects
thermal conductivity
Valence bands
Fermi level
scattering
Substitution reactions
Sintering
Acoustics
point defects

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

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abstract = "Low-temperature electronic and thermal transport measurements are carried out on nanostructured Zn1-xAlxTe (0 ≤ x ≤ 0.15) fabricated using hydrothermal synthesis followed by evacuated-and-encapsulated sintering. A single parabolic band with acoustic phonon scattering is used to analyze thermoelectric transport data. It is found that reduced Fermi energy gets closer to the valence band edge and density of states effective mass, effective density of states, and Hall factor decrease with increasing x in doped samples. The chemical carrier concentration, carrier density independent mobility, β, and theoretical zT values increase with increasing x in doped samples. The nanostructured Zn1-xAlxTe exhibits significant reduction of thermal conductivity at 300 K (1.82-3.71 W m-1 K-1) as compared to bulk ZnTe (18 W m-1 K-1). The point-defect scattering and phonon-grain scattering play an important role in reducing the lattice thermal conductivity. In addition, partial substitution of Al3+ for Zn2+ significantly improves both the power factor and zT values.",
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Characterization and analysis of thermoelectric transport using SPB model in nanostructured aluminum doped zinc tellurium. / Bhaskar, Ankam; Pai, Yi Hsuan; Liu, Chia-Jyi.

In: Journal of Physics D: Applied Physics, Vol. 50, No. 45, 455503, 23.10.2017.

Research output: Contribution to journalArticle

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