Abstract
The effect of annealing atmosphere on microstructural and photoluminescence characteristics of multiferroic BiFeO3 (BFO) thin films deposited by pulsed laser deposition (PLD) technique is reported. The films annealed in oxygen environment showed improved microstructure and photoluminescence (PL) characteristics. The PL spectra of oxygen-annealed BFO thin films at room temperature show a strong emission in the blue region. A plot of (αE)2 vs. photon energy (E) (α-absorption coefficient) and the linear extrapolation to (αE)2=0 indicates a direct gap at 2.69±0.02 eV, which is in agreement with the previous reports. The results obtained in this study are accordingly expected to facilitate the understanding and optimization of BFO thin films for photovoltaic applications.
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