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Your search keyword '"Mostafa, Nasser Y."' showing total 180 results
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180 results on '"Mostafa, Nasser Y."'

30. Structure and optical properties of Sb-doped CH3NH3PbI3: effect on perovskite solar cell performance.

Author

Bolbol, Ahmed M., Elshimy, Hassan, Abd-Elkader, Omar H., Kamel, M., Shata, Salah A., Tolba, Ahmed M., Ibrahim, Magdy, and Mostafa, Nasser Y.

Abstract

In this paper, we have shown that Sb has been doped into the light-absorbing methylammonium lead iodide (CH3NH3PbI3) perovskite. We had anticipated that the introduction of antimony (Sb3+) as a dopant in perovskite would result in improved light-absorbing properties for use in photovoltaic cells, including longer carrier lifetimes and an ideal band gap. We used a simplified and cost-effective method to fabricate thin films of CH3NH3PbI3 perovskite doped with antimony, which were deposited onto cleaned FTO substrates using a modified two-step spin-coating process. To evaluate the characteristics of these films, we utilized three different techniques: XRD, SEM, and UV-Vis spectroscopy to analyze their structural, optical, and dielectric properties. It was discovered that the optical band gap varied with Sb-doping concentration. The XRD data showed that there were no additional peaks, suggesting that Sb was able to partially replace Pb2+ successfully. However, the crystallinity increased with doping up to 1.0%, but decreased at higher concentrations. This finding aligns with the SEM morphology of the resulting films, which exhibited regular crystallites on a more even, compact, and complete surface. Finally, the IV curve showed improvement in the performance of the fabricated PSCs by increasing the Sb-doping ratio until 2.0% but decreased at the high concentration of 3.0%. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Correction: Al-Qhtani et al. Half Metallic Ferromagnetism and Transport Properties of Zinc Chalcogenides ZnX2Se4 (X = Ti, V, Cr) for Spintronic Applications. Materials 2022, 15, 55

Author

Al-Qhtani, Mohsen, primary, Mustafa, Ghulam M., additional, Mazhar, Nasheeta, additional, Bouzgarrou, Sonia, additional, Mahmood, Qasim, additional, Mera, Abeer, additional, Zaki, Zaki I., additional, Mostafa, Nasser Y., additional, Alotaibi, Saad, additional, and Amin, Mohammed, additional

Published
2022
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48. Fabrication and Characterization of W-Substituted ZnFe 2 O 4 for Gas Sensing Applications.

Author

Al-Enizi, Abdullah M., Abd-Elkader, Omar H., Shaikh, Shoyebmohamad F., Ubaidullah, Mohd, Abdelkader, Mohamed O., and Mostafa, Nasser Y.

Subjects
PORE size distribution, ZINC ferrites, DOPING agents (Chemistry), POROSITY, SOL-gel processes, FERRITES, CHEMICAL properties
Abstract

A sol–gel technique was successfully employed in creating pure and W-substituted zinc ferrite, with nominal compositions of ZnFe2−2xWxO4 (0.0 ≤ x ≤ 0.15). For the purposes of investigating the physical and chemical properties of the generated powders, several analytical techniques were used. In TEM images of all the compositions, mixed-shaped particles (cubic, spherical, and hexagonal) were observed. The crystallite size decreases from 82 nm (x = 0.0) to 32 nm (x = 0.15) with an increase in the W doping contents in the ZnFe2O4 lattice. The microstrain increases with increasing W doping content. Furthermore, the surface area of pure ZnFe2O4, 0.05 W-ZnFe2O4, 0.10 W-ZnFe2O4, and 0.15 W-ZnFe2O4 NPs were calculated as being 121.5, 129.1, 134.4 and 143.2 m2 g−1, respectively, with a mesoporous pore structure for all ferrite samples. The calculated BJH pore size distribution was within the range of 160 to 205 Å. All W-doped ZnFe2O4 samples show H-M loops with paramagnetic characteristics. The magnetization (M) directly increases by increasing the applied field (H) without achieving saturation up to 20 kA/m. For comparison, the magnetization at 20 kA/m gradually decreases with increasing W doping content. Among all the synthesized samples, the 0.15 W-ZnFe2O4 NPs demonstrated the highest sensitivity towards acetone gas at 350 °C. [ABSTRACT FROM AUTHOR]

Published
2022
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