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Effect of Number of Layers on Structural, Optical and Electrical Properties of Sol Gel Spin Coater Deposited TiO2 Thin Films
Neha Sharma, Rekha Aggarwal and Rajesh Kumar
In this research work, titanium dioxide thin films were prepared by solgel spin coating technique. The films were deposited on a glass substrate having 7, 8, 9 and 10 layers. The XRD study confirms the formation of tetragonal anatase phase of TiO2. The crystallinity of the films increases as the number of coating layers increases and the crystallite sizes ranges from 5 nm to 17 nm. The Field Emission Scanning Electron Microscope (FESEM) micrographs reveal that the films exhibit porous structure. The decrease in the optical band gap from 3.73 to 3.64 eV with an increase in number of coating layers of the TiO2 thin films was observed. From the electrical studies, it was observed that the electrical resistivity of the films decreases as the number of coating layers increases and the TiO2 thin film with 10 layers has least resistivity value i.e. 2.96×10-14Ω due to the decrease in band gap and grain boundaries.
Keywords: Multilayered, UV-Visible spectra, band gap