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The Optical Properties of Aluminum-Doped Zinc Oxide Thin Films (AZO): New Methods for Estimating Gap States

  • Vali Dalouji
  • Parisa Ebrahimi
  • Nina Binaei
  • Ehsan Tanhaee
  • Negin Beryani Nezafat
  • Laya Dejam
  • Shahram Solaymani
Original Paper
  • 8 Downloads

Abstract

In this work, aluminum-doped zinc oxide (AZO) films were annealed under argon flux at different temperatures and cooled down slowly to room temperature. Afterward, optical properties of samples were studied and their optical band gap were estimated by different methods such as dR/dλ (3.33–3.83 eV), dT/dλ (3.8–4.1 eV), optical conductivity (3.7–4.53 eV), dielectric relaxation time (3.65–3.87 eV), d(αhν)/dhν (3.44–3.95 eV), Tauc power law (3.4–4 eV), and the single oscillator model (2.67–3.37 eV). Increasing annealing temperature caused a redshift in the maximum of the dielectric relaxation time (τ) peaks. The dispersion parameters were studied through single oscillator model. The oscillator strength (f) and the dispersion energy (Ed) of films were decreased by increasing annealing temperature so that the films annealed at 600 C had minimum Urbach’ s energy (Eu) of 0.05 eV with minimum disordered. Due to high Al content, asdeposited films had maximum dielectric constant at higher wavelength (ε)

Keywords

Annealing temperatures Absorption coefficient Optical band gap Complex optical conductivity 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Vali Dalouji
    • 1
  • Parisa Ebrahimi
    • 1
  • Nina Binaei
    • 2
  • Ehsan Tanhaee
    • 3
  • Negin Beryani Nezafat
    • 4
  • Laya Dejam
    • 5
  • Shahram Solaymani
    • 4
  1. 1.Department of Physics, Faculty of ScienceMalayer UniversityMalayerIran
  2. 2.Department of Physics, Science and Research BranchIslamic Azad UniversityTehranIran
  3. 3.Department of PhysicsUniversity of TehranTehranIran
  4. 4.Young Researchers and Elite Club, West Tehran BranchIslamic Azad UniversityTehranIran
  5. 5.Department of Physics, West Tehran BranchIslamic Azad UniversityTehranIran

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