STUDIES ON STRUCTURAL AND OPTICAL PROPERTIES OF LiFePO4 THIN FILMS

Abstract

LiFePO4 thin films were synthesized using cost effective spin coating method coupled with sol-gel process. Theprepared LiFePO4 thin films were characterized by X-ray diffraction (XRD), UV-visible spectroscopy, Fourier Infrared Spectroscopy and Scanning Electron Spectroscopy. Grain size of the film was found to increase with the number of coating cycles. The films showed high optical transmittance over 90.75% in the visible range. Optical band gap energy of the films evaluated from optical absorption data was about 3.4 eV. Thickness and grain size of the films are increased with the number of spin coating cycles. Crystallization is increased at higher coating cycles. The band gap values are found to vary between 3.4 eV and 3 eV depending upon number of coating cycles.