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Applied Physics A

, 122:155 | Cite as

Thermoelectric nanocrystalline YbCoSb laser prepared layers

  • Miroslav JelínekEmail author
  • Radek Zeipl
  • Tomáš Kocourek
  • Jan Remsa
  • Jiří Navrátil
Article
  • 150 Downloads

Abstract

Filled thermoelectric Yb x Co4Sb12 layers were prepared by pulsed laser deposition method. The Yb0.19Co4Sb12 target was fabricated by hot pressing. Various deposition conditions were tested: target—substrate distance d T–S (4 or 6 cm), ambient argon pressure (from 0.5 to 13 Pa), laser repetition rate (from 3 to 10 Hz), substrate temperature (from 250 to 400 °C) and laser fluence (in region from 0.8 to 5 J cm−2). Film roughness was determined by mechanical profilometer and by AFM. For d T–S = 4 cm we observed a deficit of Yb and surplus of Co. Sb was transferred from target to film roughly stoichiometrically (as measured by EDX). Films created at 0.8 J cm−2 exhibited generally poor stoichiometry and mechanical properties. Optimal conditions and stoichiometric transport were found for d T–S = 6 cm and 13 Pa of Ar. XRD shows that the films were nanocrystalline with CoSb3 structure. Grain size was in the range of ~50–80 nm. Temperature dependence of Seebeck coefficient and power factor was measured. Thermoelectric efficiency ZT ~ 0.04–0.05 was measured at room temperature using Harman method. In dependence on layers quality, we calculated thermal conductivity λ ~ 0.4–1.3 W K−1 m−1.

Keywords

Atomic Force Microscope Power Factor Pulse Laser Deposition Seebeck Coefficient Laser Repetition Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The project has been supported by Czech Grant Agency under GA13-33056S and the Grant Agency of the Czech Technical University in Prague under Grant No. SGS14/168/OHK4/2T/17. We thank Dr. Ludvik Beneš for XRD measurement.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Miroslav Jelínek
    • 1
    • 2
    Email author
  • Radek Zeipl
    • 1
  • Tomáš Kocourek
    • 1
    • 2
  • Jan Remsa
    • 1
    • 2
  • Jiří Navrátil
    • 3
  1. 1.Institute of Physics ASCR v.v.i.PragueCzech Republic
  2. 2.Faculty of Biomedical EngineeringCzech Technical University in PragueKladnoCzech Republic
  3. 3.Institute of Macromolecular Chemistry ASCR v.v.i.PragueCzech Republic

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