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Dr. Mabrook S. Amer

Lecturer

Postdoc researcher

كلية العلوم
2A7, Building .5
publication
Journal Article
2021

Anion Substitution Effects on the Structural, Electronic, and Optical Properties of Inorganic CsPb(I1–xBrx)3 and CsPb(Br1–xClx)3 Perovskites: Theoretical and Experimental …

Aldwayyan*, Hamid M. Ghaithan*, Saif M. H. Qaid*, Zeyad A. Alahmed*, Mahmoud Hezam, Andreas Lyras, Mabrook Amer, and Abdullah S. . 2021

 

Several inorganic perovskites of iodine, bromine, and chlorine halides have emerged as candidates for various optoelectronic devices. High-quality CsPb(I1–xBrx)3 and CsPb(Br1–xClx)3 (x = 0.00, 0.25, 0.50, 0.75, and 1.00) inorganic perovskite thin films were prepared in this study using a thermal evaporation system. Experiments and first-principles calculations were conducted to elucidate the structural, electronic, and optical properties of the prepared films at room temperature. The thin-film perovskite band gap was tuned from 1.85 to 3.13 eV by replacing I– with Br– and then Cl–. Dominant excitonic effects on the onset of optical absorption led us to explicitly account for enhancing absorption through the Sommerfield factor, enabling us to extract the electronic band gap and the exciton binding energy correctly. We correlated our experimental results with the theory of first principles and gained insight into the lattice parameters, electronic structure, excitonic binding energy (Eb), dielectric constant (ε), and reduced effective mass (μ) of the carriers. With increasing concentration (x) of Br and Cl, the Eb increased from 39.44 meV for pure CsPbI3 to 63.04 and 96.73 meV for pure CsPbBr3 and CsPbCl3, respectively, because of a decrease in the dielectric constant and the almost constant value of μ at ∼0.051 me. The Urbach energy (EU) was calculated and found to fluctuate between 28 and 77 meV.

 

Publication Work Type
بحث
Volume Number
125
Issue Number
1
Magazine \ Newspaper
The Journal of Physical Chemistry C
Pages
886-896
more of publication
publications

The development of greatly stable and cost-effective electrocatalysts for urea electro-oxidation reactions (UERs) is urgent and challenging for promoting urea removal in the wastewater and…

by Mabrook S Amer, Prabhakarn Arunachalam, Abdulaziz M.Alsalman, Abdullah MAl-Mayouf, Zeyad A.Almutairi, Saba A.Aladeemy, Mahmoud Hezam
2022
Published in:
Elsevier
publications

Developing more active and stable electrode materials for oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is necessary for electrocatalytic water and urea oxidation which can be…

by Mabrook S. Amer , Prabhakarn Arunachalam , Abdullah M. Al-Mayouf, Ahmad A. AlSaleh, Zeyad A. Almutairi
2023
Published in:
Elsevier
publications

 

by Hamid M. Ghaithan*, Saif M. H. Qaid*, Zeyad A. Alahmed*, Mahmoud Hezam, Andreas Lyras, Mabrook Amer, and Abdullah S. Aldwayyan*
2021