Journal of Sol-Gel Science and Technology

, Volume 72, Issue 2, pp 421–427 | Cite as

Structural and optical properties of TiO2 thin films prepared by spin coating

  • I. Sta
  • M. Jlassi
  • M. Hajji
  • M. F. Boujmil
  • R. Jerbi
  • M. Kandyla
  • M. Kompitsas
  • H. Ezzaouia
Original Paper


Transparent semiconducting thin films of titanium oxide (TiO2) were deposited on glass substrates by the sol–gel method and spin-coating technique. The physical properties of the prepared films were studied as a function of the number of spun-cast layers. The microstructure and surface morphology of the TiO2 films were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM), with respect to the film thickness. The XRD analysis reveals that the films are polycrystalline with an anatase crystal structure and a preferred grain orientation in the (101) direction. The morphological properties were investigated by AFM, which shows a porous morphology structure for the films. The optical properties of the films were characterized by UV–Visible spectrophotometry, which shows that the films are highly transparent in the visible region and their transparency is slightly influenced by the film thickness, with an average value above 80 %. The dependence of the refractive index (n), extinction coefficient (k), and absorption coefficient (α) of the films on the wavelength was investigated. A shift in the optical band gap energy of the films from 3.75 to 3.54 eV, as a function of the film thickness, has been observed.


Thin films Sol–gel Titanium oxide Physical properties Nanomaterials 


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • I. Sta
    • 1
  • M. Jlassi
    • 1
  • M. Hajji
    • 1
    • 2
  • M. F. Boujmil
    • 1
  • R. Jerbi
    • 1
  • M. Kandyla
    • 3
  • M. Kompitsas
    • 3
  • H. Ezzaouia
    • 1
  1. 1.Photovoltaic Laboratory, Research and Technology Center of EnergyBorj-Cedria Science and Technology ParkHammam-LifTunisia
  2. 2.National School for Electronics and TelecommunicationsTechnology Park of SfaxSakiet-EzzitTunisia
  3. 3.Theoretical and Physical Chemistry InstituteNational Hellenic Research FoundationAthensGreece

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