Ce–Co-doped BiFeO ₃ multiferroic for optoelectronic and photovoltaic applications

Abstract

The Ce-Co-doped BiFeO 3 multiferroic, Bi 1−x Ce x Fe 1−x Co x O 3 (x = 0.00, 0.01, 0.03, and 0.05), has been prepared by a sol-gel auto-combustion method and analyzed through Raman spectroscopy, photoluminescence, and UV-visible spectroscopy. We have observed an anomalous intensity of the second-order Raman mode at ∼ 1260 cm −1 in pure BFO and suppressed intensity in doped samples, which indicates the presence of spin two-phonon coupling in these samples. The photoluminescence spectra show reduction in the intensity of emission with the increasing dopant concentration, which indicates the high charge separation efficiency. A sharp absorption with three charge transfer (C-T) and two d-d transitions are shown by UV-visible spectra in the visible region. The band gap of BiFeO 3 (BFO) is decreasing with increasing dopant concentrations and the materials are suitable for photovoltaic applications.

Hydrothermal synthesis of Ce/Zr co-substituted BiFeO3: R3c-to-P4mm phase transition and enhanced room temperature ferromagnetism

“…A similar increase in optical band gap is also reported for Y and Co co-doping of BFO due to a decrease in the density of state in the valence band [42]. However, there are contradictory reports on the effect of Ce substitution on the bandgap energy of BFO [43][44][45]. Here, the increase of the gap energy cannot be originated the shift of the optical bandgap, with increasing Ce content (Ce acts as a donor) [7,[41][42][43][44][45].…”

“…However, there are contradictory reports on the effect of Ce substitution on the bandgap energy of BFO [43][44][45]. Here, the increase of the gap energy cannot be originated the shift of the optical bandgap, with increasing Ce content (Ce acts as a donor) [7,[41][42][43][44][45]. These will lead to a shift in the fundamental absorption edge towards higher photon energy.…”

Optical investigation on pure and Fe, Mn doped lanthanum cobalt oxide (LaCoO3) nanoparticle

“…The decrease in band gap of Fe and Mn doping is due to the presence of 3d electron closer to the lower edge of the conduction band. Because of the decrease in energy band gap, the energy levels are induced and further influence the forbidden energy gap [12]. The decline in band gap of doped LaCoO3 is suitable for the excitation of electrons to conduction band and increase the photoelectric conversion efficiency of LaCoO3.…”

A first‐principles prediction of thermophysical and thermoelectric performances of SrCeO 3 perovskite

“…[42][43][44][45][46] Moreover, the recent studies on some rare earth (Bsite) based oxide perovskites like BaNpO (T = V, Co, Cr, Mn), 55 XTaO 3 (X = Rb, Fr) 56 MAlO 3 (M = Ce, Pr), 57 XFeO 3 (X = Sr, Ba) 58 and fluoride, calcium perovskites like KZnF 3 , 59 ANCa 3 (A = Sb, Bi) 60 were also investigated for their thermophysical performances. Besides the physical properties, perovskite materials have also been renowned for their applications in spintronics, 61 sensors and electrodes in fuel cells, 62 solar cells, [63][64][65] and in memory devices. Moreover, recent studies on thermophysical, photoluminescent, temperatureinduced thermal barrier coating application, doped perovskite, and optical properties of SrCeO 3 have also been reported.…”