Properties of TiO2 thin films deposited by rf reactive magnetron sputtering on biased substrates

Sawsen Nezar, Nadia Saoula, Samira Sali, Mohammed Faiz, Mogtaba Mekki, Nadia Aïcha Laoufi, Nouar Tabet

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

TiO2 thin films are of paramount importance due to their pervasive applications. In contrast to previous published works where the substrate was heated at high temperatures to obtain TiO2 crystalline phase, we show in this study that it is possible to deposit crystalline TiO2 thin films on biased and unbiased substrate at room temperature using reactive rf magnetron sputtering. The bias voltage was varied from 0 V to −100 V. The deposited films were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV–vis spectroscopy, Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and atomic force microscopy (AFM). The average crystallite size was estimated using x-ray diffraction. The results showed that the application of negative bias affects the surface roughness of the films and favors the formation of the rutile phase. The root mean square roughness (Rrms), the average grain size and the optical band gap of the films decreased as the substrate bias voltage was varied from 0 to −100 V. The UV–visible transmittance spectra showed that the films were transparent in the visible range and absorb strongly in the UV range. This study shows that biasing the substrate could be a promising and effective alternative to deposit TiO2 crystallized thin films of engineered properties at room temperature.

Original languageEnglish
Pages (from-to)172-179
Number of pages8
JournalApplied Surface Science
Volume395
DOIs
Publication statusPublished - 15 Feb 2017

Fingerprint

Reactive sputtering
Magnetron sputtering
Thin films
Substrates
Bias voltage
Deposits
Surface roughness
Crystalline materials
Optical band gaps
Crystallite size
Temperature
Fourier transform infrared spectroscopy
Raman spectroscopy
Atomic force microscopy
X ray photoelectron spectroscopy
Diffraction
Spectroscopy
X ray diffraction
X rays

Keywords

  • Anatase
  • Bias voltage
  • Magnetron sputtering
  • Rutile
  • TiO thin films

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Properties of TiO2 thin films deposited by rf reactive magnetron sputtering on biased substrates. / Nezar, Sawsen; Saoula, Nadia; Sali, Samira; Faiz, Mohammed; Mekki, Mogtaba; Laoufi, Nadia Aïcha; Tabet, Nouar.

In: Applied Surface Science, Vol. 395, 15.02.2017, p. 172-179.

Research output: Contribution to journalArticle

Nezar, Sawsen ; Saoula, Nadia ; Sali, Samira ; Faiz, Mohammed ; Mekki, Mogtaba ; Laoufi, Nadia Aïcha ; Tabet, Nouar. / Properties of TiO2 thin films deposited by rf reactive magnetron sputtering on biased substrates. In: Applied Surface Science. 2017 ; Vol. 395. pp. 172-179.
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