Abstract
Effect of cobalt substitution on the band gap and absorption coefficient of the BiFeO3 thin films formed on quartz substrate by low cost spin coating method have been investigated. BiFe1−xCoxO3 (x=0, 0.03, 0.06 and 0.10) thin films are polycrystalline and it retains the rhombohedral distorted perovskite structure up to 10mole% of Co substitution. Smooth and compact surface morphology with uniform size particles are observed in SEM micrographs. Narrowing and broadening of band gap is observed as a function of Co content. Two strong emission peaks at ~2.51eV and ~2.38eV are recorded for all films with noticeable change in intensity. Results obtained from the optical absorption and photoluminescence spectroscopy experiments have shown that there exists an inverse correlation between the variation in the band gap and the concentration of oxygen vacancies. Band gap decreased by ~100meV and absorption coefficient increased by 28% at the wavelength of 375nm in 6mole% Co substituted thin film and these observations are necessary requirements to improve the efficiency of photovoltaic devices.
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