Structural, Morphological, and Optical Properties of Nanocrystalline (Bi2O3)1−x:(TiO2)x Thin Films for Transparent Electronics

Gbashi, Kadhim R.; Najim, Aus A.; Muhi, Malek A.H.; Salih, Ammar T.

doi:10.1007/s11468-018-0840-1

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…It has been observed that after an optimum coating of Bi 2 O 3 , the band gap values increased slightly (for 25-BTRs). This variation of the band gap with varying concentrations might be due to unit cell volume mismatch; this behavior is consistent with the work reported . The reduction in the band gap values indicates the shift of the light absorption toward the visible region that may in turn facilitate the charge generation and utilization under the illuminations of the major portion of the solar spectrum .…”

Section: Resultssupporting

confidence: 90%

“…Moreover, 20-BTRs also exhibits the highest photocharge generation capability and lowest charge transfer resistance compared to other prepared photoelectrodes, enabling higher utilization of the photogenerated charge efficiently. Being a composite of p-type Bi 2 O 3 and n-type TiO 2 , ,− ,, an internal space charge layer is generated at the interface in the BTRs photoelectrodes. This favors the electronic transfer toward the charge collector, as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

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Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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The growing world population is closely associated with the increased demand of safe drinking water and sustainable energy production. This drives the focus of the scientific community to work toward water remediation and clean energy generation. The combination of photoelectrooxidation of pollutants at the anode with simultaneous hydrogen gas production at the cathode is a smart strategy to address these problems. Herein, we have designed a bifunctional photoelectrocatalytic system consisting of a self-standing photoanode to degrade the water pollutant molecules with simultaneous production of molecular hydrogen at the cathode. The photoanode was prepared by coating Bi2O3 over the surface of self-standing TiO2 nanorods. Thus, prepared photoelectrodes show high degradation efficiency for rhodamine molecules, where direct oxidation of rhodamine by the holes generated under solar light illumination was detrimental for its activity. During simultaneous pollutant removal and energy production experiments, the anode shows 100% degradation of pollutant molecules while the cathode shows high hydrogen gas production (128 mM cm–2 h–1). The prepared composite showed higher efficiency of visible-light absorbance, high charge generation capability, and low charge transfer resistance at the interface as determined via several characterizations, compared to the bare titania. The catalyst is easy to prepare and robust in activity for several kinds of pollutant molecules tested. Its robust activity, high stability, and durability open up an avenue for the wastewater treatment with simultaneous renewable energy production technologies.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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“…From the results shown in Table 2, the optical bandgap decreases from 2.65 to 2.45 eV as the Sc 3+ concentration increases in the solid solution. The values here determined for phonon energy are close to the Fe‐doped Bi 2 O 3 photocatalyst, [ 57 ] and reduced compared with the (Bi 2 O 3 ) 1− x :(TiO 2 ) x thin films. [ 58 ] The decreasing tendency in the bandgap energy indicates a rearrangement of electrons in the solid solution due to the hybridization of the orbitals Bi 6 s and O 2 p in the balance band, resulting in a Bi—O bond length reduction in the crystal lattice.…”

Section: Resultsmentioning

confidence: 64%

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Ramirez-Dela Cruz,

Bocanegra-Bernal,

Márquez-Torres

et al. 2024

Physica Status Solidi (a)

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Quaternary compositions of polycrystalline Bi1.74Dy0.14W0.12−xScxO3 (x = 0.02, 0.03, 0.04, 0.05, 0.06) solid solutions are synthesized by the solid‐state reaction method. The 4a site symmetry of the space group occupied by Sc3+ ion retains the cubic fluorite‐type over a wide temperature range (450–700 °C) for low Sc3+ content without losing the δ‐phase. Dielectric and ionic conductivity by complex impedance in the frequency range from 0.1 to 100 kHz suggests a temperature‐ and Sc3+‐dependent relaxation process. The ionic conductivity increases with the Sc3+ content over the whole tested temperature range. An oxygen ion conductivity of 0.102 Scm−1 at 700 °C and an activation energy of 0.32 eV are achieved for x = 0.06. Optical properties and Rietveld refinement indicate a bandgap reduction due to a bond length reduction (Bi—O). These materials have potential in photocatalysis and water‐splitting technology due to their UV and visible region absorption capabilities.

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“…The ALD is the technique more studied because higher surface passivation is obtained, but with the demerits of time consuming and the complex post process to reduce the surface recombination 13 . The pulsed laser deposition (PLD) method has been also studied to obtain TiO 2 compound thin films to produce ARC in solar cells or TCOs (transparent conductor oxides) [14][15][16] . The high vacuum evaporation was used to deposit ARC TiO 2 films, but surface passivation was not analyzed 12,13,17,18 .…”

Section: Introductionmentioning

confidence: 99%

TiO2 Antireflection Coating Deposited by Electro-Beam Evaporation: Thin Film Thickness Effect on Weighted Reflectance and Surface Passivation of Silicon Solar Cells

et al. 2022

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Titanium dioxide was extensively used in solar cell industry and currently has been studied to produce passivated contacts in PERC/PERT and TOPCon solar cells. The aim of this paper was to analyze the impact of the thickness of TiO 2 thin films deposited by electro-beam evaporation on the weighted reflectance and the surface passivation on silicon solar cells. Thin films with different thicknesses were deposited to produce PERT solar cells, varying from 50 to 90 nm. The surface passivation was enhanced as the thickness was increased. For instance, at 400 nm, the internal quantum efficiency increased from 71% to 76% when the thickness of the TiO 2 was augmented from 50 nm to 90 nm. The lowest weighted reflectance was obtained in samples with 80 nm thick TiO 2 films. Considering the compromise between antireflection properties and surface passivation, the highest efficiency solar cells were produced with 80 nm thick TiO 2 .

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Structural, Morphological, and Optical Properties of Nanocrystalline (Bi2O3)1−x:(TiO2)x Thin Films for Transparent Electronics

Cited by 16 publications

References 35 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

TiO2 Antireflection Coating Deposited by Electro-Beam Evaporation: Thin Film Thickness Effect on Weighted Reflectance and Surface Passivation of Silicon Solar Cells

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Structural, Morphological, and Optical Properties of Nanocrystalline (Bi2O3)1−x:(TiO2)x Thin Films for Transparent Electronics

Cited by 16 publications

References 35 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Dielectric and Optical Properties of δ‐Bi2O3 Quaternary Semiconducting Solid Solutions

TiO2 Antireflection Coating Deposited by Electro-Beam Evaporation: Thin Film Thickness Effect on Weighted Reflectance and Surface Passivation of Silicon Solar Cells

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Product

Resources

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Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions