Yazar "Alyousef, Haifa A." seçeneğine göre listele

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    Exploring the impact of substrate placement on Cu3N thin films as a solar cell window layer: Structural and optical attributes
    (Elsevier, 2023) Alyousef, Haifa A.; Hassan, A. M.; Zakaly, Hesham M. H.
    Copper nitride (Cu3N) thin films have garnered significant interest due to their exceptional stability, corrosion resistance, and optical qualities. In this research, Cu3N thin films were produced through reactive dc magnetron sputtering (dcMS) in a nitrogen/argon atmosphere on glass substrates without any external heat treatment. The study examined the effects of substrate positions from the cathode target, and subsequently film thicknesses, on the structure and optical properties of Cu3N thin films. Different methods were employed to examine the structural and optical characteristics of the films, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible-near infrared (UV-vis-NIR) spectrophotometry in the wavelength range of 400-2500 nm. The XRD patterns indicated a cubic crystal structure for the films with a dominant orientation along the (100) plane, while SEM images displayed uniform and smooth surface morphologies for the films. The UV-vis-NIR spectrophotometry findings demonstrated transmittance above 70% in the visible region for the films, and the optical bandgap values ranged between 2.29 and 2.49 eV. The optical conductivity (& sigma;), electrical susceptibility (& chi;c), and optical electronegativity (& eta;opt) have been calculated. Furthermore, the nonlinear optical qualities of Cu3N thin films were discussed, including the nonlinear refractive index (n2), the nonlinear optical susceptibility, and the nonlinear absorption coefficient (& beta;c). The Cu3N thin films showed promising optical properties, suggesting their potential use as a window layer in solar cell technology.
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    Optimizing the structure and optoelectronic properties of cuprite thin films via a plasma focus device as a solar cell absorber layer
    (Royal Soc Chemistry, 2024) Hassan, Ahmed M.; Alyousef, Haifa A.; Zakaly, Hesham M. H.
    Solar cells are of growing importance as a renewable energy source, and cuprite (Cu2O) stands out as a promising material due to its cost-effectiveness, abundance, and appealing optoelectronic characteristics. This research uses diverse analytical methods to adjust the influence of the number of plasma focus shots on Cu2O films' crystal structure, morphology, and optoelectronic attributes. X-ray diffraction revealed that both Cu2O and CuO films exhibited a polycrystalline nature with cubic (111), (110), and (200) orientations. Morphological analysis unveiled that film surface characteristics were impacted by the number of shots, leading to the formation of smaller Cu2O grains as the number of shots increased. The transmittance spectra of Cu2O thin films displayed remarkable optical transparency, approximately 80%. The optical bandgap of the films was determined to be 2.57 eV, decreasing to 2.08 eV with an increase in the number of shots, aligning well with values reported for photovoltaic absorber layers. Optoelectronic properties, including optical and electrical conductivities, optical mobility, optical carrier concentrations, refraction loss, optical resistivity, plasmon, and damping frequencies, were computed. The results underscore the significant impact of the number of plasma focus shots and hold great promise for enhancing the performance of Cu2O-based solar cells.