Studying Some Optical Properties of Magnesium Oxide by Depending on Different Thicknesses

Mohammedain Adam Allhgabo Belal; Magzoub Mohammed Alhassan Mustafa; Ali Salih Ali Salih; Elsadig Omer Fadul Younis; Hajer Adam Mohmmed Adam; Hleima Faddal Ezaldein Rewais; Mohammed Abbas Alhag Mohammed; Safa Hussein Hassan Braima; Tasabeeh Farh Althir Hassan

doi:10.32213/fmmpsn22

Authors

Mohammedain Adam Allhgabo Belal Department of Physics, Faculty of Science, University of Kordofan, Elobeid, Sudan Author
Magzoub Mohammed Alhassan Mustafa Department of Physics, Faculty of Science, University of Kordofan, Elobeid, Sudan Author
Ali Salih Ali Salih Department of Physics, Faculty of Education, University of Kordofan, Elobeid, Sudan Author
Elsadig Omer Fadul Younis Department of Physics, Faculty of Science, University of Kordofan, Elobeid, Sudan Author
Hajer Adam Mohmmed Adam Department of Physics, Department of Physical Sciences, Faculty of Science, Jazan University, Saudi Arabia Author
Hleima Faddal Ezaldein Rewais Department of Physics, Faculty of Education, University of Kordofan, Elobeid, Sudan Author
Mohammed Abbas Alhag Mohammed Electrical Department, Faculty of Engineering and Technical Studies, Kordofan University, Sudan Author
Safa Hussein Hassan Braima Department of Diagnostic Radiology, Military Hospital, Elobeid, Sudan Author
Tasabeeh Farh Althir Hassan Department of Diagnostic Radiology, Military Hospital, Elobeid, Sudan Author

DOI:

https://doi.org/10.32213/fmmpsn22

Keywords:

Magnesium oxide, Thicknesses, Optical properties, Absorbance, Transmittance, Absorption coefficient, Energy gap

Abstract

This study investigates the optical properties of magnesium oxide (MgO) thin films with different thicknesses (16, 24, and 36 nm) using a UV–Vis spectrophotometer (Min 1240). The absorbance spectra showed a similar behavior for all samples, with a sharp increase around 460 nm, and higher absorbance values for thinner films. The transmittance spectra revealed a decrease with decreasing thickness in the wavelength range of 382–487 nm. The absorption coefficient (α) was calculated and found to be greater than 6.64 × 10⁴ cm⁻¹, indicating direct electronic transitions. The optical Energy gap (Eg) was determined using the Tauc method and found to be 2.558 eV. A slight decrease in Eg with increasing thickness was observed, attributed to structural changes, including reduced defect density and grain-boundary effects.