| Improvement of optoelectronic and spintronic properties of nanocrystalline Zn1-x GdxS films deposited by electron beam technique |
| Paper ID : 1052-ISCHU |
| Authors |
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Hany Mohammad Hashem * Physics department - faculty of science - Helwan university |
| Abstract |
| This paper reports the enhancement of the optoelectronic and spintronic properties of nanocrystalline Fe-doped ZnO nanoparticles synthesized by co-precipitation method. The structure and microstructural exposed the hexagonal structure of the NPs, and its average crystallite size reduced from 43.75 nm (x = 0) to 38.13 nm (x = 0.12), that definite the nano-crystalline nature of the NPs. Surface morphological studies using Transmission Electron Microscope (TEM) suggest the decrease in particle size with increase in Fe doping level in ZnO. The results of the optical measurements showed that Fe doping in ZnO caused a decrease in the optical band gap due to an increase in defects. Furthermore, the refractive index n was found to increase with the level of Fe doping. This increase in refractive index was attributed to the increase in polarizability. The dispersive oscillator parameters such as the single oscillator energy Eo, the dispersion energy Ed, the static refractive index n0 were calculated by Wemple and DiDomenico (WDD) model. The Non-linear optical parameters; third-order non-linear optical susceptibility χ(3) , non-linear absorption coefficient β_c and non-linear refractive index N2 are evaluated from dispersive oscillator parameters. The findings indicate that the ability to adjust the optical band gap and dispersive oscillator parameters of Fe-doped ZnO nanoparticles reflects an improvement in non-linear optical parameters, which makes these nanoparticles well-suited for use in optoelectronic devices. The magnetic measurements results show that the Fe-doped ZnO NPs has intrinsic room temperature ferromagnetic behavior. These results indicate that Fe-doped ZnO NPs is effective for designing magnetic devices. FTIR illustrates the good crystalline superiority of the NP samples. XPS (X-ray Photoelectron Spectroscopy shows the percent of chemical elements and binding energies between each of them in the Fe-doped ZnO NPs. PL spectra confirmed that the samples exhibited six peaks in the visible region. Finally, all the dielectric parameters investigated with frequency and temperature that show dispersion nature and dielectric constant has been found to decrease with Fe content. The gained dielectric behavior has been understood on the basis of Maxwell–Wagner (M - W) mechanism and Koop’s theory. |
| Keywords |
| Diluted magnetic semiconductors; Metal Oxides; Nanocrystalline; microstructure properties; Optoelectronic; Spintronic; single oscillator parameters; dielectric constant; Photonics. |
| Status: Abstract Accepted (Poster Presentation) |