Production and Characterization of (004) Oriented Single Anatase TiO2 Films

Atay F., Akyüz İ., Cergel M. S., Erdogan B.

JOURNAL OF ELECTRONIC MATERIALS, cilt.47, sa.2, ss.1601-1610, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 47 Sayı: 2
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s11664-017-5988-5
  • Dergi Adı: JOURNAL OF ELECTRONIC MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.1601-1610
  • Anahtar Kelimeler: (004) Oriented TiO2, ultrasonic spray pyrolysis, XRD, spectroscopic ellipsometry, FESEM, temperature dependent conductivity, SPRAY-PYROLYSIS TECHNIQUE, THIN-FILMS, OPTICAL-PROPERTIES, PHOTOCATALYTIC ACTIVITY, ELECTRICAL CHARACTERIZATION, SOLAR-CELLS, TEMPERATURE, DEGRADATION, DYE, ORIENTATION
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

Highly (004) oriented anatase TiO2 films have been successfully obtained by an inexpensive ultrasonic spray pyrolysis technique at low substrate temperatures and without additional annealing. X-ray diffraction analysis, ultraviolet visible spectroscopy and field emission scanning electron microscopy were used to analyze the structural, optical and surface properties of the films. By using the less reported TiCl4 solution, the optical band gap values falling into the visible region (between 2.70 eV and 2.92 eV) have been obtained for all films. Spectroscopic ellipsometry technique has been used to determine the dispersive refractive index and extinction coefficient of TiO2 films. Possible electrical conduction mechanisms in TiO2 films have been examined using temperature dependent conductivity measurements in the temperature range of 78-300 K. At room temperature, electrical resistivity values of TiO2 films change between 1.68 x 10(4) Omega cm and 5.88 x 10(4) Omega cm. Considering the analyzed parameters with respect to substrate temperature, this work refers to the properties of anatase TiO2 films that are strongly correlated to the growth direction, namely (004). As a result, (004) oriented anatase TiO2 films with appropriate optical band gap values are promising materials for technological applications, especially for photocatalysts.