Title page for etd-0727115-160339


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URN etd-0727115-160339
Author Meng-Jie Yang
Author's Email Address edc65100429@gmail.com
Statistics This thesis had been viewed 5333 times. Download 196 times.
Department Physics
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Structural evolution of epitaxial Cu2O/MgO superlattices
Date of Defense 2015-07-28
Page Count 60
Keyword
  • Superlattices
  • Cu2O
  • MgO
  • CuO
  • Epitaxy
  • Abstract This thesis investigates the epitaxial growth and structural characterizations of Cu2O/MgO superlattices, which consist of alternating layers of cuprous oxide and magnesium oxide epitaxial thin films. The superlattices were grown on c-oriented sapphire (Al2O3) substrates by sputtering at various temperatures under an optimized gas pressure of Ar:O2 mixtures. The intended layer-by-layer growth of superlattices of planar interfaces were not successful when grown at high temperature as the Cu2O films tended to grow in island forms. To entice the so-call layer-by-layer growth that supposedly would lead to planar surface or interfaces, the growth temperatures were dramatically decreased, albeit possibly at the sacrifice of some degree of crystalline perfection only achievable at high temperatures. Without losing the epitaxial nature of the superalttices, however, the adopted range of temperatures of the thin film deposition were somehow able to reduce the mobility of the deposited atoms, as represented by the suppressed island formation and realized smoother interfaces. In this work, high-resolution analytical x-ray diffractometry (XRD), such as 2theta-omega, or grazing angle (GIXRD) scans, and grazing angle X-ray reflectivity (XRR) measurements, were employed to characterize the epitaxial and interfacial nature of the superlattices, and scanning electron microscopy (SEM) was used to observe the surface morphology, while transmission electron microscopy (TEM) operated in high resolution mode, coupled with the electron diffraction pattern formation, was used to achieve atomic imaging and micro- and nanostructures characterizations of the samples. The effects of an initial MgO layer that was grown at high temperature and the overall dependence of the growth temperature are discussed based on the correlated findings.
    Advisory Committee
  • Li-Wei Tu - chair
  • Chih-hsiung Liao - co-chair
  • Der-June Jang - co-chair
  • Quark Chen - advisor
  • Files
  • etd-0727115-160339.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2015-08-28

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