Effect of Zn-doping on the structural and optical properties of BaTiO3 thin films grown by pulsed laser deposition

A. Y. Fasasi*, M. Maaza, E. G. Rohwer, D. Knoessen, Ch Theron, A. Leitch, Ulrich Buttner

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    31 Scopus citations

    Abstract

    Thin films of zinc oxide doped barium titanate (BaZnxTi1 - xO3) have been prepared by pulsed laser ablation using different targets having zinc composition varying between x = 1 to 5 wt.% at a step of 1 wt.% on corning glass microscope slide and silicon substrates. X-ray diffraction analyses showed films to be of tetragonal phase with an average grain size of 20 nm and c/a ratio of 1.08 indicating lattice expansion due to ZnO incorporation. Atomic force microscopy studies of the prepared thin films indicated smooth surfaces with average roughness of 1.84 and 4.6 nm for as-deposited and sintered specimens respectively. Scanning electron microscopy showed films to be smooth and uniform. UV-Visible as well as Fourier Transform Infrared transmission measurements showed a transmission of more than 80% in the visible and 5-20% in the near infrared. The transmittance is strongly affected by annealing. There is a dependence of band gap energy on film thickness as well as on the amount of ZnO added. High ZnO dopant level led to an increase in the band gap.

    Original languageEnglish (US)
    Pages (from-to)6226-6232
    Number of pages7
    JournalThin Solid Films
    Volume516
    Issue number18
    DOIs
    StatePublished - Jul 31 2008

    Keywords

    • Band gap
    • Barium titanate
    • Laser ablation
    • Optical properties
    • Refractive index dispersion
    • Zinc oxide

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Materials Chemistry

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