Authors : Khalid Haneen Abass, Mohammed Hadi Shinen and Ayad F. Alkaim
Abstract: The aim of this research is to prepare TiO2 films on Indium Tin Oxid (ITO)-glass substrates with various nano-layers via. sol-gel method and study the properties that make these films suitable for solar cell application. Polycrystalline TiO2 films are resulting from X-Ray Diffraction (XRD) examination with preferred orientation along (101) plane appear for the films with thickness more than 107 nm (3 layers) at 2θ = 25.62°. Other peaks appear (211), (004) and (200) at 2θ = 30.27, 35.49 and 48.69, respectively and the crystallite size ranged from 15-32 nm for the prepared films. The homogeneity of the films is appear from the scanning electron microscope in addition of smooth and free of pinholes. UV-Visible spectrophotometer use to recording the transmittance spectra in the range of 360-1000 nm. The energy gaps were determined by Touc Model and from the dispersion parameters which found good comparable to be 3.21 eV for the film thickness 155 nm (5 layers). The energy loss of electrons which travelling through surface and bulk of material also determined. Urbach energy is increase with the increasing of film thickness. Dispersion parameters (Eo, Ed) determined from Wemple and DiDomenco relationship.
Khalid Haneen Abass, Mohammed Hadi Shinen and Ayad F. Alkaim, 2018. Preparation of TiO2 Nanolayers via. Sol-Gel Method and Study the Optoelectronic Properties Assolar Cell applications. Journal of Engineering and Applied Sciences, 13: 9631-9637.