Ferroelectric, ferromagnetic and optical properties of KBiFe<sub>2</sub>O<sub>5</sub>thin film: a structure property relationship

Jalaja, M. A.; Predeep, P.; Dutta, Soma

doi:10.1088/2053-1591/4/1/016401

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…To our knowledge this is the first time that epitaxy of KBFO is obtained. Previous work on KBFO films obtained by sol–gel and spin coating were polycrystalline. , If the bandgap found of 2.3 eV is relatively high compared to the optimum for the solar spectrum for a single bandgap solar cell, the photoactive properties of KBFO have been clearly demonstrated which is a further step in polar functional materials. To further investigate the photovoltaic properties of the material, a suitable epitaxial conductive buffer layer on MAO (001) should be found to provide an electrode for KBFO.…”

Section: Discussionmentioning

confidence: 99%

“…It was argued that the short-circuit current density was limited due to the fact that measurements were made on single-crystal KBFO. Thus, the synthesis of KBFO layers using a sol–gel process and spin-coating has been reported. , KBFO has a brownmillerite-type structure A 2 B 2 O 5 with lattice parameters a = 0.7984 nm, b = 1.1819 nm, and c = 0.5739 nm with an orthorhombic space group P 2 1 cn . In addition, magnetoelectric and photovoltaic (PV) effects in KBFO were studied theoretically in ref .…”

Section: Introductionmentioning

confidence: 99%

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Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Fix

Schmerber

Rehspringer

et al. 2019

ACS Appl. Energy Mater.

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KBiFe 2 O 5 (KBFO) was grown by pulsed laser deposition (PLD) on SrTiO 3 (001) (STO), 1 at% Nb-SrTiO 3 (001) (Nb-STO) and MgAl 2 O 4 (001) (MAO). In the case of MAO substrate, epitaxial growth is obtained. As its bandgap is relatively low (1.6 eV in the bulk), KBFO is a promising candidate for oxide photovoltaics. In this work we examine the growth of KBFO by PLD by looking at its structure and composition and we investigate the optical properties of the films obtained. A photovoltaic architecture based on KBFO films is proposed and a solar cell behaviour based on KBFO absorber is obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Fix

Schmerber

Rehspringer

et al. 2019

ACS Appl. Energy Mater.

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“…Finally, from Equation ( 11 ) the band gap energy

is studied as a function of the ion doping. Let us emphasize that values around 1.6 eV for orthorhombic structures (which are here considered) [ 1 , 9 ] and around 1.7 eV for monoclinic structures [ 2 , 13 ] are reported. The low band gap behavior in KBFO is caused by the FeO

tetrahedron structure with small crystal field splitting energy [ 13 ].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Ferroelectricity in KBFO is attributed to displacements of K

and Bi

ions. Magnetoelectric, magnetodielectric, and optical properties of bulk KBFO [ 4 , 5 , 6 , 7 , 8 ] and KBFO thin films showing well-saturated polarization hysteresis loops [ 9 , 10 , 11 ] have been considered in the last few years. The band gap value of KBFO thin films with orthorhombic structure is found to be 1.67 eV [ 10 ], i.e., it is larger than in bulk KBFO and is appropriate for visible light absorption.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Apostolov,

Apostolova,

Wesselinowa

2023

Materials

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The magnetic, electric, dielectric, and optical (band gap) properties of ion doped multiferroic KBiFe2O5 (KBFO) have been systematically investigated utilizing a microscopic model and the Green’s function theory. Doping with Co at the Fe site and Ru at the Bi site induces changes in magnetization, coercive field, and band gap energy. Specifically, an increase in magnetization is observed, while the coercive field and band gap energy decrease. This behavior is attributed to the distinct ionic radii of the doped and host ions, leading to alterations in the exchange interaction constants. The temperature dependence of the polarization P reveals a distinctive kink at the Neel temperature TN, which shifts to higher temperatures with an increase in the applied magnetic field h. Furthermore, doping with Ru and La leads to an increase in polarization. The temperature dependence of the dielectric constant exhibits two peaks at the Neel temperature TN and the Curie temperature TC. Notably, these peaks diminish with increasing frequency. Additionally, the dielectric constant demonstrates a decrease with the rise in the applied magnetic field h. This study sheds light on the intricate interplay between ion doping, structural modifications, and multifunctional properties in KBFO, offering valuable insights into the underlying mechanisms governing its behavior across various physical domains.

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Theoretical Study of Magnetization and Electrical Conductivity of Ion‐Doped KBiFe₂O₅ Nanoparticles

Apostolov,

Apostolova,

Wesselinowa

2024

Physica Status Solidi (b)

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The electrical conductivity σ and magnetization M of (KBFO) nanoparticles (NPs) are systematically examined using a microscopic model and Green's function theory. KBFO is characterized by a narrow bandgap and relatively weak electrical conductivity σ, which presents a problem in carrier transportation and collection. Therefore, ways to enhance σ are found. The first is reducing the NP size. The second one is doping at the Fe and Bi sites with different ions which cause a compressive strain, that is, their ionic radius is smaller than that of the host ion. It is shown that doping with Al at the Fe site as well as with Ru or La ions at the Bi site leads to enhancing the electrical conductivity σ. The magnetization M increases with increasing concentration of all dopants.

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Ferroelectric, ferromagnetic and optical properties of KBiFe₂O₅thin film: a structure property relationship

Cited by 16 publications

References 26 publications

Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Theoretical Study of Magnetization and Electrical Conductivity of Ion‐Doped KBiFe₂O₅ Nanoparticles

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Ferroelectric, ferromagnetic and optical properties of KBiFe2O5thin film: a structure property relationship

Cited by 16 publications

References 26 publications

Investigation of KBiFe2O5 as a Photovoltaic Absorber

Investigation of KBiFe2O5 as a Photovoltaic Absorber

Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Theoretical Study of Magnetization and Electrical Conductivity of Ion‐Doped KBiFe2O5 Nanoparticles

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Product

Resources

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Ferroelectric, ferromagnetic and optical properties of KBiFe₂O₅thin film: a structure property relationship

Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Investigation of KBiFe₂O₅ as a Photovoltaic Absorber

Theoretical Study of Magnetization and Electrical Conductivity of Ion‐Doped KBiFe₂O₅ Nanoparticles