Cristin-resultat-ID: 1890636
Sist endret: 16. februar 2021, 21:41
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Correlations of thermal properties with grain structure, morphology, and defect balance in nanoscale polycrystalline ZnO films

Bidragsytere:
  • Anna Kaźmierczak-Bałata
  • Lucyna Grzadziel
  • Marek Guziewicz
  • Vishnukanthan Venkatachalapathy
  • Andrej Kuznetsov og
  • Maciej Krzywiecki

Tidsskrift

Applied Surface Science
ISSN 0169-4332
e-ISSN 1873-5584
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021

Importkilder

Scopus-ID: 2-s2.0-85100264269

Beskrivelse Beskrivelse

Tittel

Correlations of thermal properties with grain structure, morphology, and defect balance in nanoscale polycrystalline ZnO films

Sammendrag

ZnO thin films grown by atomic layer deposition method were investigated to analyse the correlation between morphology, chemical defects and thermal properties. This analysis became possible by measuring series of similarly thick wurtzite ZnO films synthesized using identical number of deposition cycles at two temperatures – 100 °C and 200 °C. By comparing these sample series, exhibiting the thickness variations from 12 to 118 nm, several prominent correlations for the thermal properties was observed - measured by high-resolution scanning thermal microscopy at room temperature. Specifically, comparing thinnest samples in the series, a lower thermal conductivity was revealed in samples grown at 100 °C and these variations were interpreted in terms of changing populations of native donors, affecting the free carrier concentration and, as such, the thermal conductivity. Further, the increase in thickness for the samples grown at 200 °C was accompanied with a continuous shift to Zn-rich conditions and the corresponding increase in the thermal conductivity, specifically from 0.28 Wm−1 K−1 to 2.81 Wm−1 K−1. As such, we have decoupled the thickness effect on the thermal conductivity from the rest of the phenomena, explaining the thermal transport in terms of the bulk thermal contributions within the grains combined with additional thermal resistance introduced by the grain boundaries.

Bidragsytere

Anna Kaźmierczak-Bałata

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Lucyna Grzadziel

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Marek Guziewicz

  • Tilknyttet:
    Forfatter

Vishnukanthan Venkatachalapathy

  • Tilknyttet:
    Forfatter
    ved Senter for materialvitenskap og nanoteknologi ved Universitetet i Oslo
  • Tilknyttet:
    Forfatter
    ved National Research Nuclear University "MEPHI"

Andrej Kuznetsov

  • Tilknyttet:
    Forfatter
    ved Halvlederfysikk ved Universitetet i Oslo
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