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Effect of substrate on the structural transformation and optical properties of Zn1 − xMgxO thin films grown by pulsed laser deposition
Published in Acta Materialia Inc
2018
Volume: 146
   
Pages: 196 - 199
Abstract
Pulsed laser deposited MgxZn1 − xO films grown on sapphire substrates exhibited wurtzite hexagonal structure at lower Mg concentrations (x < 0.20), whereas use of MgO substrates promotes cubic rocksalt structure. For x ≥ 0.20, single-phase cubic ZnMgO thin films with 〈200〉 orientation were realized on MgO substrates. However, the films grown on sapphire substrates exhibited single-phase cubic structure with 〈111〉 orientation only when x ≥ 0.4. We show that the optical bandgap of wurtzite ZnMgO films can be tuned from 3.27 eV to 3.80 eV. On the other hand cubic ZnMgO films exhibited larger bandgap values as high as 5.99 eV. © 2017 Acta Materialia Inc.
About the journal
JournalScripta Materialia
PublisherActa Materialia Inc
ISSN13596462
Open AccessNo
Concepts (23)
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    Binary alloys
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    Deposition
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    Energy gap
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    Magnesium alloys
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    MAGNESIUM COMPOUNDS
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    Optical properties
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    Pulsed laser deposition
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    Pulsed lasers
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    Sapphire
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    Spectroscopy
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    Substrates
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    Zinc alloys
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    Zinc compounds
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    Zinc sulfide
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    BAND-GAP VALUES
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    CUBIC STRUCTURE
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    Hexagonal structures
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    MG CONCENTRATIONS
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    ROCK-SALT STRUCTURE
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    Sapphire substrates
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    Structural transformation
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    Znmgo thin films
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    Thin films