Abstract
Titanium dioxide (TiO2) thin films were prepared by Chemical Bath Deposition (CBD) method. The X-ray diffraction (XRD) analysis was used to examine the structure and to determine the crystallite size of TiO2 thin film. The surface morphology of the film was studied using Scanning Electron Microscopy (SEM).The optical properties were studied using the UV-Visible and photoluminescence (PL) spectrum. Optical constants such as band gap, refractive index, extinction coefficient and electric susceptibility were determined. The FT-IR spectrum revealed the strong presence of TiO2. The dielectric properties of TiO2 thin films were studied for different frequencies and different temperatures. The AC electrical conductivity test revealed that the conduction depended both on the frequency and the temperature. Photoconductivity study was carried out in order to ascertain the positive photoconductivity of the TiO2 thin films.
Highlights
The study of semiconducting thin films is being pursued with growing interest on account of their established and useful applications in many semiconductor devices such as solar energy converters, optoelectronics devices etc 1
Earlier investigations of the microstructural and optical properties of TiO2 films synthesized by the Chemical Bath Deposition (CBD) technique had shed much light. They have shown that the characteristics such as film thickness, bonding configuration, optical absorption and optical bandgap and structure are a function of deposition time 20. Based on this fact we report the synthesis and the characterization of TiO2 thin films
The TiO2 thin films were deposited by means of CBD technique at room temperature using titanium tetra isopropoxide and isopropanol as the starting materials
Summary
The study of semiconducting thin films is being pursued with growing interest on account of their established and useful applications in many semiconductor devices such as solar energy converters, optoelectronics devices etc 1. There has been an enormous deal of attention being bestowed upon the making of inexpensive thin films, due to their high varying characteristics. The physical and chemical properties of TiO2 are such that it becomes suitable for a wide spectrum of applications It is an excellent electrode material that can be used for the conversion of light energy into electrical energy because of its semiconductor properties. Its wide applications such as supercapacitors, dye-sensitized solar cells, quantum-dot-sensitized solar cells, lithium ion batteries, photoelectrolysis, water splitting, biosensors, photochromic devices, self-cleaning, and extremely thin absorber (ETA) solar cells have already been explored 8-17. TiO2 films can be synthesized by many chemical and physical deposition techniques, such as chemical vapor deposition, spin coating or spin casting, atomic layer
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