Journal ArticleDOI
Photoconductivity induced by nanoparticle segregated grain-boundary in spark plasma sintered BiFeO3
Reads0
Chats0
TLDR
In this article, photo-response of nanoparticle-segregated grain boundary (BFO-AP) and clean grain boundary(BFO -AA) samples was investigated on spark plasma sintered BiFeO3 samples with two contrasting morphologies.Abstract:
Photoconductivity studies on spark plasma sintered BiFeO3 samples with two contrasting morphologies, viz., nanoparticle-segregated grain boundary (BFO-AP) and clean grain boundary (BFO-AA), show that their photo-response is largely influenced by the grain boundary defects. Impedance analyses at 300 K and 573 K clearly demarcate the contributions from grain, grain-boundary, and the nanoparticle-segregated grain-boundary conductivities. I-V characteristics under 1 sun illumination show one order of higher conductivity for BFO-AP, whereas conductivity decreases for BFO-AA sample. Larger photocurrent in BFO-AP is attributed to the extra conduction path provided by oxygen vacancies on the nanoparticle surfaces residing at the grain boundaries. Creation of photo-induced traps under illumination and the absence of surface conduction channels in BFO-AA are surmised to result in a decreased conductivity on illumination.read more
Citations
More filters
Journal ArticleDOI
Ferroelectric Materials for Solar Energy Conversion: Photoferroics Revisited
TL;DR: The application of ferroelectric materials (i.e. solids that exhibit spontaneous electric polarisation) in solar cells has a long and controversial history as mentioned in this paper, and the recent successful application of inorganic and hybrid perovskite structured materials (e.g. BiFeO3, CsSnI3, CH3NH3PbI3) emphasises that polar semiconductors can be used in conventional photovoltaic architectures.
Journal ArticleDOI
Enhanced magnetic and dielectric properties of Gd doped BiFeO3: Er nanoparticles synthesized by sol-gel technique
TL;DR: In this paper, the effect of Gd content (in Gd/Er co-dopant) on the structural, magnetic, dielectric, and optical properties of the BiFeO3 materials has been studied.
Journal ArticleDOI
Anisotropic lattice expansion determined during flash sintering of BiFeO3 by in-situ energy-dispersive X-ray diffraction
Mary Anne B. Wassel,Luis A. Pérez-Maqueda,Eva Gil-González,Eva Gil-González,Harry Charalambous,Antonio Perejón,Shikhar Krishn Jha,John S. Okasinski,Thomas Tsakalakos +8 more
TL;DR: In this article, a flash sintered BiFeO3 was flash-sintered at 500°C to achieve 90% densification, and the material did not undergo any phase transformation.
Journal ArticleDOI
Oxygen vacancy induced photoconductivity enhancement in Bi 1-x Ca x FeO 3-δ nanoparticle ceramics: A combined experimental and theoretical study
TL;DR: Based on experimental and density functional studies, the authors showed that tailoring of oxygen vacancies (OV) leads to large scale enhancement of photoconductivity in BiFeO3 (BFO).
Journal ArticleDOI
Photoferroelectric phenomena in ferroelectric oxides and a Rayleigh analysis
TL;DR: In this paper, the photoinduced dielectric, pyroelectric, and ferroelectric properties of a lead-free lead free oxide were carried out in out-of-plane and in-plane geometry.
References
More filters
Journal ArticleDOI
Physics and Applications of Bismuth Ferrite
Gustau Catalan,James F. Scott +1 more
TL;DR: In this paper, the authors summarize both the basic physics and unresolved aspects of BiFeO3 and device applications, which center on spintronics and memory devices that can be addressed both electrically and magnetically.
Journal ArticleDOI
Switchable ferroelectric diode and photovoltaic effect in BiFeO3.
TL;DR: It is found that bulk electric conduction in ferroelectric monodomain BiFeO3 crystals is highly nonlinear and unidirectional.
Journal ArticleDOI
Above-bandgap voltages from ferroelectric photovoltaic devices
S. Y. Yang,Jan Seidel,Jan Seidel,Byrnes Steven J,Byrnes Steven J,Padraic Shafer,Chan-Ho Yang,Marta D. Rossell,Pu Yu,Ying-Hao Chu,James F. Scott,Joel W. Ager,Lane W. Martin,Ramamoorthy Ramesh,Ramamoorthy Ramesh +14 more
TL;DR: A fundamentally different mechanism for photovoltaic charge separation is reported, which operates over a distance of 1-2 nm and produces voltages that are significantly higher than the bandgap.
Journal ArticleDOI
Very large spontaneous electric polarization in BiFeO3 single crystals at room temperature and its evolution under cycling fields
TL;DR: In this article, electric polarization loops are measured at room temperature on highly pure BiFeO3 single crystals synthesized by a flux growth method, and the resulting low leakage currents allow the authors to measure a large spontaneous polarization in excess of 100μCcm−2.
Journal ArticleDOI
Photovoltaic effects in BiFeO3
S. Y. Yang,Lane W. Martin,Byrnes Steven J,Byrnes Steven J,Thomas E. Conry,Thomas E. Conry,S. R. Basu,D. Paran,Lothar A. Reichertz,Jon F. Ihlefeld,Carolina Adamo,A. Melville,Ying-Hao Chu,Chan-Ho Yang,Janice L. Musfeldt,D. G. Schlom,Joel W. Ager,Ramamoorthy Ramesh,Ramamoorthy Ramesh +18 more
TL;DR: In this article, the photovoltaic effect in ferroelectric BiFeO3 thin films was reported and the all-oxide heterostructures with SrRuO3 bottom and tin doped indium oxide top electrodes were characterized by open-circuit voltages ∼08-09V and external quantum efficiencies up to ∼10% when illuminated with the appropriate light.