Abstract
Pristine and Mn-doped bismuth ferrite samples were prepared by sol–gel method. XRD patterns showed rhombohedral to orthorhombic phase transition with Mn doping in BiFeO3 sample. The surface morphology of the samples was carried out by scanning electron microscope which exhibited a decrease in grain size with Mn doping. Magnetic hysteresis curves exhibit that manganese doping induces modification in magnetic properties of bismuth ferrites. Significant modification was observed in dielectric with Mn doping and maximum value was recorded for BiFe0.8Mn0.20O3 sample. P–E hysteresis curves were recorded to evaluate the ferroelectric properties of all samples at room temperature. A significant improvement was observed in ferroelectric properties in doped samples. Bandgap values of BiFe1−xMnxO3 in UV–Vis region decreases with Mn doping and minimum for BiFe0.80Mn0.20O3 sample as evaluated from Tauc’s plots. I–V studies of pristine and Mn-doped samples were carried out with light and without light. Enhanced photocurrent density was observed in Mn-doped BFO samples. Hence, these modifications in ferroelectric and photovoltaic properties of BiFe1−xMnxO3 samples make bismuth ferrites a good candidate for photovoltaic applications.
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