Structural, optical, and electronic properties of non-stoichiometric nano-ZnS1−x: Mnx

Ahmed

2021

Opt Quant Electron

Self Cite

Nano Cd 0.9 Mg 0.05 S was synthesized applying the thermolysis technique in air and under flow of nitrogen. Samples obtained exhibited CdS structure with two phases. Rietveld refinement analysis was used to determine the different structure parameters. Analysis of UV-Vis absorption spectra disclosed that the optical band gap of CdS sample prepared in N 2 is less than that of the corresponding sample prepared in air. The optical band gap of CdS (air) sample was decreased as it doped with Mg while it increased as Mg doped CdS (N 2 ) sample. The photoluminescence (PL) intensities of CdS samples were enhanced when they doped with Mg. Moreover, the PL intensity of CdS (air) increased further as it prepared under nitrogen. The emitted PL colors (violet, blue and green) depended on the condition of preparation of the different samples. Density functional theory calculation (DFT) was applied to explain the variation in the optical band gap of CdS upon doping with Mg. DFT calculation revealed that the absorption, refractive index, extinction coefficient, the dielectric properties and photoconductivity response were affected by the kind of defects in the sample. Mg-doped stoichiometric or non-stoichiometric CdS have a non-magnetic nature.

Section: Electronic Analysismentioning

confidence: 78%

Section: Electronic Analysismentioning

confidence: 99%

Optical and electronic correlation in Mg-doped nano cadmium sulfide

Ahmed

2021

Opt Quant Electron

Self Cite

“…Nano semiconductor materials exhibited different properties as compared with their bulk counterpart; therefore, they are applied in many optoelectronic applications [1][2][3][4][5]. Zinc and cadmium sulfides (ZnS and CdS) materials belong to II-VI groups which possess unique characteristics that may apply in many fields [4,5]. ZnS and CdS displayed good adaptability to alter its structural, electronic, magnetic, electric, and optical features [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of vanadium doping on the structural and optical characteristics of nano ZnCdS

Badawi

2022

Phys. Scr.

Self Cite

Nano Zn0.75-xCd0.25VxS (0≤x≤0.2, step 0.05) samples were formed by the molten salt solid state reaction method at low temperature. Synchrotron x-ray diffraction phase identification revealed biphasic ZnS structure for all samples, cubic zinc blende and hexagonal wurtzite. Rietveld analysis was applied to determine the effect of V-doping on the percentage of each phase and their structural and microstructural parameters. The existence of V ions in the Zn0.75Cd0.25S (ZnCdS) lattice is confirmed by Fourier-transform infrared spectroscopy (FTIR) technique. Utilizing the UV-vis diffuse reflectance spectroscopy, the effect of V-doping on the absorption, reflectance, refractive index, extinction coefficient and electric properties of ZnCdS were studied in detail. The optical bandgap (Eg) significantly decreased from 2.82 eV for zero V-doping to 2.55 eV for x=0.2. Also, the refractive index decreased sharply in the wavelength region 450-900 nm. ZnCdS sample has anomalous dispersion behavior while the doped samples have anomalous and normal dispersion features. The photoluminescence intensity and emitted colors in the UV and visible regions were affected by the amount of doping.

“…This light absorption edge can be redshifted upon doping the material with a suitable dopant element [3]. For example, as the semiconductor materials doped with transition metals such as Ni, Co, Mn, Fe…, the formed materials exhibited more exotic characteristics because of spin-spin exchange interactions [4][5][6][7][8]. For instants, doping ZnCdSe/ZnS core/shell quantum dots with Fe, the emission intensity was improved [9].…”

Section: Introductionmentioning

confidence: 99%

Modifying the Electronic and Optical Properties of Nano ZnS via Doping With Mn and Fe

Shimy

et al. 2021

Preprint

5% Fe and Mn-doped nano ZnS (Zn0.95A0.05S, A=Fe or Mn) was prepared using the thermolysis technique. The effect of Fe and Mn doping on the lattice parameter, crystallite size, and lattice microstrain was examined applying Rietveld refinement. The analysis showed the incorporation of Fe and Mn substitutionally for Zn ions; a result confirmed by Fourier transforms infrared spectroscopy spectra from the shift in the vibration bands upon doping. The energy of ZnS band gap was reduced by doping, giving ZnS new applications. The different defects inside the different samples were investigated using photoluminescence spectroscopy. The effect of Fe/ Mn doping and incorporation of atmospheric oxygen on the bandgap characteristics, the absorption, optical conductivity, refractive index and the extinction coefficient, reflectance, the real and imaginary parts of the dielectric constant were explored using density function theory calculation (DFT).