Author(s): M. Obaida, I. Moussa, S. A. Hassan, S. E. Demian, H. H. Afify
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 03 , March - 2017
Titanium Oxide films are deposited by pulse spray pyrolysis (PSP) technique on glass substrates. Samples with different thicknesses are prepared by keeping the substrate temperature constant at 400oC while varying the spray time (30 - 90 min.). The crystal structure and phase are determined by GAXRD. Dislocation density is deduced from calculation of grain size obtained from the GAXRD. The energy gap, refractive index, film thickness and porosity are calculated from the transmittance spectra by adopting Swanepoel method. The photoconductivity of the samples is calculated by measuring the current before and after UV- illumination at constant voltage. The dynamic response to UV of the samples is obtained, with varying their thicknesses corresponding to On/ Off cycles of UV lamp. The prepared samples may be have an energy gap which is empty from inter-band states as inferred from the sharp absorption edge in the transmittance spectra and sharp decay of photocurrent in the dynamic response to UV illumination.
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