Effect of the annealing on the power factor of un-doped cold-pressed SnSe

J. O. Morales Ferreiro, D. E. Diaz-Droguett, D. Celentano, J. S. Reparaz, C. M. Sotomayor Torres, S. Ganguli, T. Luo

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    17 Citations (Scopus)

    Abstract

    © 2016 Elsevier Ltd Tin Selenide (SnSe), a thermoelectric material of the chalcogenide family, has attracted tremendous interest in the past few years due to its unprecedented thermoelectric figure-of-merit, ZT, of 2.6. In this work we have carried out an experimental study of the impact of annealing on the thermoelectric properties of polycrystalline SnSe formed by cold-pressing un-doped SnSe powders with a Hall carrier concentration of 5.37 × 1017 cm−3. The crystalline structure and morphology of the samples are characterized and properties, including electrical conductivity, Seebeck coefficient and thermal conductivity, are measured. It is found that thermal annealing has a large impact on both the microstructure and the thermoelectric properties. Notably, annealing leads to re-alignment of crystalline domains, increase in Seebeck coefficient by a factor of as much as 3, and increase in the electrical conductivity. A peak ZT of 0.11 was achieved at 772 K which is smaller than un-doped polycrystalline SnSe.
    Original languageEnglish
    Pages (from-to)1426-1432
    JournalApplied Thermal Engineering
    Volume111
    DOIs
    Publication statusPublished - 25 Jan 2017

    Keywords

    • Electrical conductivity
    • Figure-of-merit ZT
    • Seebeck coefficient
    • SEM
    • Thermal conductivity
    • XRD

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