Effect of preparation methods and doping on the structural and tunable emissions of CdS

Mohamed, Mohamed Bakr; Abdel-Kader, M. H.; Alhazime, Ali A.; Almarashi, Jamal Q. M.

doi:10.1016/j.molstruc.2017.11.045

Cited by 36 publications

(21 citation statements)

References 53 publications

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“…33 Hu et al found the energy gap of CuS with hierarchical mesoporous solid spheres has an energy gap ~1.48 eV while the energy gap of CuS with hollow spheres is ~1.63 eV, respectively. 34 Furthermore, the band gap of doped Ga 2 O 3 increased from 4.95 to 6.17 eV as the amount of Mg increased from 0% to 27.62% due to the higher MgO band gap as compared with the Ga 2 O 3 band gap. 23 Palve et al 11 changed the ratio of Cu:S from 1:1 to 1:5 in preparation of CuS, and they found that the energy gap increased as the amount of sulfur increased in the sample.…”

Section: Optical Propertiesmentioning

confidence: 98%

Role of Cu/S ratio and Mg doping on modification of structural and optical characteristics of nano CuS

Mohamed

Abdel-Kader

Almarashi

2019

Int J Applied Ceramic Tech

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Nano CuS with different Cu to S ratio and also Mg‐doped nano CuS are prepared using a thermolysis procedure under nitrogen flows. The effect of changing copper to sulfur ratio in preparation of CuS under flowing nitrogen and also Mg‐doped CuS on the lattice parameters and crystallite size is studied using X‐ray diffraction data by applying the Rietveld profile method. Scanning electron microscope mapping is used to verify the distribution of different elements over undoped and doped CuS samples. Fourier transforms infrared spectroscopy spectra confirm that the structure of CuS is not altered by doping or changing of the Cu to S ratio. In order to examine the effect of changes of Cu to S or Mg doping on the absorption behavior of nano CuS, ultraviolet spectroscopy is used. The energy gaps of different samples are determined using Tauc’s relation. The photoluminescence spectroscopy reveals that all samples exhibit violet and blue sub‐emissions except a CuS with Cu:S ratio 1:4 which also emits green sub‐emission.

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Section: Optical Propertiesmentioning

confidence: 98%

Role of Cu/S ratio and Mg doping on modification of structural and optical characteristics of nano CuS

Mohamed

Abdel-Kader

Almarashi

2019

Int J Applied Ceramic Tech

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“…Moreover, the behavior of the energy gap of doped ZnS as compared with undoped ZnS in our case also depends on the annealing temperature; the energy gap of doped materials prepared at 300°C is less than undoped sample. 11 The PL spectra at an excitation wavelength of 370 nm for ZnS and Zn 0.9 X 0.1 S (X = Mn, Co, Fe) annealed at 300, 400, and 500°C are illustrated in Figure 5. In our case, X-ray refinement analysis revealed that at low annealing temperature iron ions exist in Fe 3+ while at higher annealing temperature iron ions exist in the form of Fe 2+ state.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Moreover, several characteristics of the nano crystalline II-VI semiconductor materials can be tuned by varying its size, morphology or doping it with suitable rare earth or transition metal elements. 11 On the other hand, Mn-doped CdS (synthesized in the air) exhibited violet, blue, and yellow colors, whereas the same composition but synthesized under N 2 flow emitted violet, blue, and green colors. 8 These above treatments enable nano crystalline II-VI semiconductor materials to be used in other several applications.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 For example, synthesized Fe doping CdS by thermolysis procedure under different conditions (air or nitrogen flow) led to emit of different colors (violet and blue). 11 On the other hand, Mn-doped CdS (synthesized in the air) exhibited violet, blue, and yellow colors, whereas the same composition but synthesized under N 2 flow emitted violet, blue, and green colors. 11 Nano ZnS doped with Co 3+ /Co 2+ emitted visible light 12 while ZnS/Cu quantum dots (QDs) revealed blue and green fluorescence emissions.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, annealing treatments of a semiconductor are very common in use to enhance the crystal quality and control the size of semiconductor nano crystals materials. 11 Nano ZnS doped with Co 3+ /Co 2+ emitted visible light 12 while ZnS/Cu quantum dots (QDs) revealed blue and green fluorescence emissions. 9,10 For example, synthesized Fe doping CdS by thermolysis procedure under different conditions (air or nitrogen flow) led to emit of different colors (violet and blue).…”

Section: Introductionmentioning

confidence: 99%

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Effect of doping and changing of the annealing temperature on the structural and optical properties of ZnS

Mohamed

2019

Int J Applied Ceramic Tech

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Nano ZnS doped with Co, Mn, or Fe have been synthesized via thermolysis technique at different annealing temperatures (300, 400, and 500°C). The effect of doping and annealing temperature on the lattice parameter and crystalline size of ZnS are studied in detail by Rietveld refinement method of X‐ray diffraction data. To confirm the formation of a zinc blend structure of annealed and doped ZnS, Fourier‐transform infrared are investigated. The energy gaps of doped and annealed ZnS are determined using ultraviolet spectroscopy technique. Undoped and doped ZnS with Fe emitted violet, blue, and green colors depend on the annealing temperature. Moreover, Mn‐doped ZnS exhibits blue‐green emission, while Co‐doped ZnS has a blue emission only.

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Studying the impact of Mg doping on the physical properties of CdS nanocrystals for the fabrication of hybrid solar cells–based organic P3HT : PCBM polymers and inorganic Mg‐doped CdS nanocrystals

Aruna-Devi

Marasamy

Mayén-Hernández

et al. 2021

Intl J of Energy Research

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Summary Herein, the influence of Mg‐doped CdS nanocrystals (NCs) on the performance of hybrid solar cells (HSCs) is investigated for the first time. Pristine and Mg‐doped CdS NCs at different concentrations (0.25, 0.5, and 0.75 mol%) are synthesized using the heating up method. The effect of Mg on structural, compositional, morphological, optical, and electrical properties of CdS NCs is examined. The structural analysis showed a peak shift toward a higher wavelength, while lattice parameters a and c are decreased. As the Mg concentration increases, the shape and size of the CdS NCs are considerably changed, while the bandgap is tuned from 2.66 to 2.44 eV. Besides, the resistivity of CdS is significantly decreased while carrier concentration increases. Then, the device is fabricated with a configuration of FTO/TiO2/P3HT:PC61BM/MoO3/Ag, wherein the influence of different concentrations of undoped and Mg‐doped CdS NCs on the performance of HSCs is explored. The Mg‐doped CdS NCs exhibited a power conversion efficiency of 2.92%, 2.5 times higher than the polymer device. Thus, the results revealed that the Mg doping significantly improved the properties of CdS NCs and the performance of HSCs. Henceforth, this work would provide a new path to enhance the power conversion efficiency of the HSCs in a low‐cost approach.

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Effect of preparation methods and doping on the structural and tunable emissions of CdS

Cited by 36 publications

References 53 publications

Role of Cu/S ratio and Mg doping on modification of structural and optical characteristics of nano CuS

Role of Cu/S ratio and Mg doping on modification of structural and optical characteristics of nano CuS

Effect of doping and changing of the annealing temperature on the structural and optical properties of ZnS

Studying the impact of Mg doping on the physical properties of CdS nanocrystals for the fabrication of hybrid solar cells–based organic P3HT : PCBM polymers and inorganic Mg‐doped CdS nanocrystals

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