Structural and Optical Characteristic of Cu-Doped TiO2 Thin Film

Mohamed, Mohamed Bakr; Badawi, Ali

doi:10.1007/s10904-022-02312-1

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…where A is a photonic energy independent constant; h is the Planck constant; υ is th frequency of the photon; α is the absorption coefficient; and n depends on the type o transition (n = 1/2 for indirect transition and n = 2 for direct transition) [33][34][35]. According to this, the Eg values of PP2 and PP8 were 3.02 and 2.91 eV, respectively, slightly lowe than the actual Eg of typical TiO2 NPs, 3.14-3.24 eV [36,37]. Figure 7 shows the Tauc plot meant for drawing optical band-gap energy (E g ) from UV-Vis spectra.…”

Section: Resultsmentioning

confidence: 99%

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Rajendhiran¹,

Atchudan

Prakash³

et al. 2023

Coatings

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Plant extracts have been utilized as an ecofriendly natural reducing agent for the synthesis of nanomaterials, including metal oxides. Prickly pear (opuntia) fruit extract (PPE) was used as a reducing agent for the sol–gel synthesis of titanium dioxide nanoparticles (TiO2 NPs) and as a sensitizer for the TiO2 NPs photoanode used in dye-sensitized solar cells (DSSCs). Ultraviolet-visible and infrared spectra, X-ray diffraction patterns, and scanning electron microscopic images were confirmed in the formation of semiconducting TiO2 NPs with the predominate size of ~300 nm. The use of PPE rendered discrete TiO2 NPs, whereas the typical synthesis without PPE resulted TiO2 aggregates. TiO2 NPs had a tetragonal crystalline structure, and their grain size was varied with respect to the concentration of PPE. The size of TiO2 crystallites was found to be 20, 19, 15, and 10 nm when the volume percentage of PPE was 0.2, 0.4, 0.6, and 0.8%, respectively. TiO2 NPs obtained using PPE were coated on indium-doped tin oxide substrates and sensitized with natural dye made up of PPE and synthetic dyes, namely rose Bengal (RB) and eosin yellow (EY). The photoanode fabricated with dye-sensitized TiO2 NPs was subjected to current–voltage response studies. The maximum power-conversion efficiency, 1.4%, was recorded for photoanodes sensitized with PPE dye, which is considerably higher than that for RB (1.16%) or EY (0.8%). Overall, the above findings proved that PPE can be used as a potential reducing/capping agent and TiO2 sensitizer for DSSC applications.

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Section: Resultsmentioning

confidence: 99%

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Rajendhiran¹,

Atchudan

Prakash³

et al. 2023

Coatings

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“…The lattice parameters of

\left(\text{TiO}\right)_{2}

are

a = b = 7.604 \textrm{ } Å

and

c = 9.715 \textrm{ } Å

, which are in good agreement with previous experimental results. [ 32 ] X‐Ray diffraction experiments have shown that Cu doping has little effect on the lattice constant of

\left(\text{TiO}\right)_{2}

, [ 33 ] so all calculations in this study ignored changes in the lattice constant. Furthermore, interstitial and oxygen sites are not suitable for occupation by Cu or other transition metals, [ 34 ] so we only considered Cu substituting for Ti (

\left(\text{Ti}\right)_{\text{(1} - x \left.\right)} \left(\text{Cu}\right)_{x} \left(\text{O}\right)_{2}

).…”

Section: Resultsmentioning

confidence: 99%

“…The DOS for all five configurations is displayed in Figure S12, Supporting Information, revealing a transition from a semiconductor to a metal or half-metal as the concentration of Cu ions increases. [33,34] Configurations B1 and B3 exhibit spin polarizations of 76.78% and 97.37%, respectively. As the distance between two Cu ions increases, the system undergoes a transition to a half-metal with 100% spin polarization.…”

Section: The Concentration and Site Of Cumentioning

confidence: 99%

The Role of Concentration, Site, and O Vacancy on Magnetic and Optical Properties of Cu‐Doped Anatase TiO₂

Yang

Huang

Wang

et al. 2023

Physica Status Solidi (b)

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Cu‐doped is a dilute magnetic semiconductor with excellent electrical, magnetic, and optical properties. Herein, first‐principles methods are employed to investigate its electronic structure, magnetic properties, and optical behavior. The results demonstrate that Cu‐doped exhibits intrinsic ferromagnetism. The presence of O vacancies facilitates the ferromagnetic exchange between Cu ions by forming bound magnetic polarons (BMPs). This finding validates the BMPs model and explains for the decrease in magnetic properties during annealing under O2 conditions. As the concentration of Cu increases, the system undergoes a transition from a semiconductor to a metal. Cu ions exhibit a preference for a compact configuration and display either paramagnetism or antiferromagnetism. The spin polarization can be effectively controlled from 0% to 100% by adjusting the concentration and site of Cu. Additionally, Cu doping leads to a reduction in the bandgap and an extension of the absorption range into the infrared region. The absorption intensity is positively correlated with the concentration. The presence of a spin‐polarized intermediate band indicates a correlation between the spin of the excited electron and the energy of the absorbed photon. Overall, Cu‐doped shows significant potential for applications in spintronics and spin‐related optics, including photospintronics and spin photocatalysis.

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“…They demonstrated decreased bandgap up to 10% of Cu doping and after that, a dual bandgap is observed owing to the formation of CuO. 18 The narrower bandgap of TiO 2 makes it suitable for solar cell devices. Khan et al used Mg-doped TiO 2 as an electron transporting and hole-blocking photoanode in dye-sensitized solar cells (DSSC) and observed the enhancement of the efficiency when the bandgap decreased with the film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 It has been observed that Cu is a good choice as a dopant in TiO 2 . The Cu doped TiO 2 nanostructures are prepared using different methods including the solid-state reaction method, 16 electrostatic spray pyrolysis method, 14 hydrothermal method, 17 spray pyrolysis technique (A), 18 sol-gel method 19 and inert gas condensation technique. 20 In the above methods, the prepared TiO 2 nanostructures are in the mixed phase, both anatase and rutile phases.…”

Section: Introductionmentioning

confidence: 99%

Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO₂microflowers

Sahoo,

Surbhi,

Bhakta

et al. 2024

Phys. Chem. Chem. Phys.

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Structural and Optical Characteristic of Cu-Doped TiO2 Thin Film

Cited by 8 publications

References 33 publications

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

The Role of Concentration, Site, and O Vacancy on Magnetic and Optical Properties of Cu‐Doped Anatase TiO₂

Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO₂microflowers

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Structural and Optical Characteristic of Cu-Doped TiO2 Thin Film

Cited by 8 publications

References 33 publications

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

Prickly Pear Fruit Extract: Capping Agent for the Sol–Gel Synthesis of Discrete Titanium Dioxide Nanoparticles and Sensitizer for Dye-Sensitized Solar Cell

The Role of Concentration, Site, and O Vacancy on Magnetic and Optical Properties of Cu‐Doped Anatase TiO2

Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO2microflowers

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Product

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The Role of Concentration, Site, and O Vacancy on Magnetic and Optical Properties of Cu‐Doped Anatase TiO₂

Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO₂microflowers