Optical properties of TiO2 Thin films prepared by Sol Gel method

International audienceTitanium dioxide is currently the focus of intensive research because of their interesting chemical, electrical and optical properties. In this work, TiO2 thin films were prepared by sol gel method, and have been deposited by spin coating technique onto glass substrates (3 - TiO2/glass). In this work, we report the effect of the spin speed (2900, 3200 and 4900 rpm) on different optical properties of the films. The samples were characterized by means of Raman spectroscopy, hall measurement and UV-Visible spectrophotometer. The transmission spectra of titanium dioxide thin films indicate that there are two parts, the first is transparent in the visible wavelength spectrum region and the second is opaque in the UV ranges. We found that the transmission curves and the calculated optical band gap increase when thespin speed increases. The Raman spectra have shown the Anatase phase

Structural and optical properties of TiO2SnO2 thin films prepared by sol gel method

International audienceTiO2SnO2 thin films were deposited on glass substrates, by using sol gel spin coating method with different ratio (3%, 5% and 7%) at 3200 rpm, to study their effect on different properties of TiO2 SnO2 thin films. The structural and optical properties of films have studied for different ratio. These deposited films have been characterized by various methods such as X-Ray Diffraction (XRD), Ultra Visible spectroscopy. The (XRD) can be used to identify crystal structure of as deposited films. The Transmission spectra have shown the transparent and opaque parts in the visible and UV wavelengths. ©2016 Taylor and Francis Group, LLC

Performance evaluation and economical analysis of three photovoltaic systems installed in an institutional building in Errachidia, Morocco

International audienceA study was conducted in order to evaluate the performance and the Economic analysis of three photovoltaic system connected to the grid (5.94 kWp) in Errachidia city in Morocco. Several parameters of the PV systems design were evaluated such as the total energy generated, final yield, reference yield, performance ratio, capacity factor and monthly system efficiency. The economic input of the three systems was determined based on economic return of electricity generation. The highest values in terms of daily final yield (YF = 5.26 h/day), performance ratio (PR = 82 %), capacity factor (CF = 21.93 %), levelized cost of electricity (LCOE = 0.068 €/kWh) and payback time (PB = 12), were recorded by pc-Si solar module. Therefore, this PV system technology could be recommended in the future research projects in Morocco. © 2018 The Authors. Published by Elsevier Ltd

Optoelectronics properties of TiO2:Cu thin films obtained by sol gel method

[EN] In this research, Cu-doped TiO2 thin films have been successfully deposited onto a glass substrate by Sol¿gel technique using dip coating method. The films were annealed at different annealing temperatures (400¿500 "C) for 1 h. The structural, optical and electrical properties of the films were investigated and compared using X-ray Diffraction,UV¿visible spectrophotometer and 4-point probe method. Optical analysis by mean transmittance T(k) and absorption A(k) measurements in the wavelength range between 300 to 800 nm allow us to determine the indirect band gap energy. DRX analysis of our thin films of TiO2:Cu shows that the intensities of the line characteristic of anatase phase increasing in function of the temperature.This work has been partially supported by LGOPS Laboratory University Polytechnic University of Valencia, Spain and LMOPS Laboratory University of Lorraine France. Technical support from LMOPS and LGOPS labs is gratefully acknowledged.Essalhi, Z.; Hartiti, B.; Lfakir, A.; Marí, B.; Thevenin, P. (2017). Optoelectronics properties of TiO2:Cu thin films obtained by sol gel method. Optical and Quantum Electronics. 49(9). doi:10.1007/s11082-017-1142-0S301499Balasingh, C., Abuhasan, A.: Diffraction peak broadening studies in Al2O3 (Whisker) composites. Powder Diffr. 6(1), 16–19 (1991)Chakrabarty, B.S.: Evaluation of optical constants of wide band gap cadmium doped polypyrrole. Impact IJRET 2(3), 37–44 (2014)Cullity, B.D.: Elements of X-ray Diffraction. Addison-Wesley Publishing Company, Reading (1978)Dhanapandian, S., Arunachalam, A.: Effect of deposition parameters on the properties of TiO2 thin films prepared by spray pyrolysis. J. Sol Gel Sci. Technol. 77, 119–135 (2016)Elkhalidi, Z., et al.: Behavior of NiO thin films sprayed at different annealing time. Opt. Quantum Electron. 48, 427 (2016)El-Korashy, A., et al.: Optical studies of (NH4)2SO4 single crystal in the paraelectric phase. J. Phys. Chem. Solids 64, 2141–2146 (2003)Huang, M., Yu, S., Li, B.: Influence of preparation methods on the structure and catalytic performance of SnO2-doped TiO2 photocatalysts. Ceram. Int. 40, 13305–13312 (2014)Jayasinghe, R.C., Perera, A.G.U.: Optical properties of nanostructured TiO2 thin films and their application as antireflection coatings on infrared detectors. Opt. Lett. 37(20), 4302–4304 (2012)Kingery, W.D., Bowen, H.K., Uhlmann, D.R.: Introduction to Ceramic, p. 457. Wiley, New York (1976)Li, C.P., Wang, J.F., Su, W.B.: Effect of sinter temperature on the electrical properties of TiO2 based capacitor-varistors. Mater. Lett. 57, 1400–1405 (2003)Luis, A.M., et al.: Influence of calcination parameters on The TiO2 photocatalytic properties. Mater. Chem. Phys. 125, 20–25 (2011)Lyson-Sypien, B., Czapla, A., Lubecka, M.: Gas sensing properties of TiO2–SnO2 nanomaterials. Sens. Actuators B 187, 445–454 (2013)Michael, G.: Sol–gel processed TiO2 films for photovoltaic applications. J. Sol Gel. Sci. Technol. 22, 7–13 (2001)Ogawa, H., Higuchi, T.: Growth of TiO2 thin film by reactive RF magnetron sputtering using oxygen radical. J. Alloys Compd. 449(1–2), 375–378 (2008)Tachibana, Y., Ohsaki, H., Hayashi, A.: TiO2–X sputter for high rate deposition of TiO2. Vacuum 59, 836–843 (2000)Tian, L., Soum-Claude, A.: Undoped TiO2 and nitrogen-doped TiO2 thin films deposited by atomic layers deposition on planar and architecture surfaces for photovoltaic applications. Vac. Surf. Films 33, 01A141 (2015)Urbach, F.: The long-wavelength edge of photographic sensitivity and of the electronic absorption of solids. Phys. Rev. 92, 1324 (1953)Wang, X., Zhang, D.: A novel sol–gel method for preparing favorable TiO2 thin films. Mater. Res. Express 3, 016401 (2016)Wang, W.B., Yanguas-Gil, A., Yang, Y.: Chemical vapor deposition of TiO2 thin films from a new halogen-free precursor. J. Vac. Sci. Technol. A 32, 061502 (2014)Yakuphanoglu, F., et al.: The determination of the optical constants of Cu (II) compound having 1-chloro-2, 3-o-cyclohexylidinepropane thin film. Opt. Commun. 239, 275–280 (2004)Yoldas, B.E., Partlow, P.W.: Formation of broad band antireflective coatings on fused silica for high power laser applications. Thin Solid Films 129(1–2), 1–14 (1985

Optimization of parameters for deposition of SnO2 films by sol-gel using Taguchi method

International audienceTransparent conductive SnO2 films were deposited on glass substrates by sol-gel spin coating method. Taguchi method was used to find the optimal deposition parameters, three influential parameters were selected in this experiment, Concentration of Tin (II) ions, annealing temperature and pre-annealing temperature. By employing the analysis of variance, we found that the annealing temperature and the precursor are the most influencing parameters on the properties of SnO2 films. Under the optimized deposition conditions, the SnO2 films showed high crystal quality, and high transmittance of 80% in the visible region. © 2015 IEEE

Effect of F-doping on structural, electrical, and optical properties of ZnO thin films for optoelectronic application

International audienceIn this work, Fluorine doped Zinc oxide (FZO) thin films were deposited by the sol-gel spin coating method. Zinc acetate dihydrate, ethanol and mono-ethanolamine were used as precursor, solvent and stabilizer, respectively. The atomic percentages of dopant in solution were [F/Zn]=1%,2%, 4% and 6%. The effect of F doping on the structural, optical and electrical properties of ZnO films were investigated by X-ray diffraction (XRD), Four-Point probe technique and UV-visible spectrophotometery. The results from the X-ray diffraction show that the pure ZnO thin films have polycrystalline structure, hexagonal wurtzite type. All the films have a highly preferential c-axis orientation, and exhibited (002) plane as a preferential growth in all the dopant ratios. Grain sizes of the films were varied in range of 36.5 to 46.2 nm. The optical transmission is decreased with the increase of the dopant concentration. The band gap energy values were determined as 3.252 eV, 3.267 eV, 3.295 eV, 2.299 eV and 3.315 eV, respectively for undoped ZnO, 1, 2, 4 and 6% mole FZO thin films. A minimum resistivity of FZO (2.7210-3) was obtained for the film doped with 29% mol of F. These results make FZO thin films an attractive candidate for transparent and electric material applications. © 2016 IEEE