A DFT study of optoelectronic, elastic and thermo-electric properties of the double perovskites Rb2SeX6 (X=Br,Cl)
Keywords:
Double perovskite, opto-electronic properties, Elastic propertiies, Seebeck coefficients, Figure of merit, DFTAbstract
Thermo-electric (TE) material applications reduce reliance on traditional energy resources by converting heat to electric energy. We have studied, for the first time, the thermo-electric properties of Rb2SeX6 (X=Br,Cl). Using norm-conserving pseudo potentials in a plane wave basis set of Quantum Espresso code, the optoelectronic, elastic and thermo-electric properties of Rb2SeX6 (X=Br,Cl) have been investigated using density functional theory. Generalized Gradient Approximation of Perdew Burke Ernzerhof (GGA-PBE) and Generalized Gradient Approximation of Perdew Burke Ernzerhof adapted for Solid (GGA-PBESol) exchange correlation functionals were employed in all calculations. The band structure plots suggest that the studied double perovskites have indirect band gaps. Rb2SeBr6 band gap values of 1.7574/ 1.569 eV (using GGA-PBE/PBEsol) are remarkably similar to that of two effective inorganic/organic perovskites FAPbI3 and MAPbI3 . Maximum peaks generated from refractive index results indicate possible solar cell uses of the materials because they are in the visible and ultraviolet ranges. The results of other optical properties such as absorption coefficients, electron energy loss, conductivity, and reflectivity concludes that Rb2SeX6 (X=Br,Cl) have good values for electron generation, high potential for applications in the optoelectronic industry and are semiconductor in nature. The calculated shear anisotropy values of Rb2SeBr6/Cl6 are 3.09/1.71, suggesting that they are isotropic materials. With calculated Poisson’s ratio of 0.32 and 0.26, the materials are predicted to be ductile in nature. The two materials are appropriate for thermo-electric applications since their thermal to electrical conductivity ratio are small (the order of 10-5). The calculated minimum values of Seebeck coefficient values of 0.198×103 / 0.166 ×103 (mV/K) at 750 K, for Rb2SeBr6/Cl6 are positive, indicating that they have p-type conduction. Figure of merit values at all temperature range considered are greater than one (ZT > 1) for both Rb2SeBr6 and Rb2SeCl6, suggesting that they are good thermo-electric materials. The results of the calculations provide the basis for the industrial application of Rb2SeBr6/Cl6 as solar cells.
Published
How to Cite
Issue
Section
Copyright (c) 2023 W. A. Yahya, A. A. Yahaya, A. A. Adewale, A. A. Sholagberu, N. K. Olasunkanmi

This work is licensed under a Creative Commons Attribution 4.0 International License.
How to Cite
Similar Articles
- Emmanuel Agboeze, Henry Okechukwu Agboeze, Theresa Orieji Uchechukwu, Anayo Vitus Ofordile, Chukwuebuka Gabriel Eze, Environmental and health risk assessment of cadmium, zinc,iron, copper in crops and soil at Enugu State dumpsite , Journal of the Nigerian Society of Physical Sciences: Volume 8, Issue 1, February 2026
- M. A. Salawu, J. A. Gbolahan, A. B. Alabi, Assessment of Radiation Shielding Properties of Polymer-Lead (II) Oxide Composites , Journal of the Nigerian Society of Physical Sciences: Volume 3, Issue 4, November 2021
- Boikanyo Makubate, Marang Pearl Matsuokwane, Lesego Gabaitiri, Broderick O. Oluyede, Simbarashe Chamunorwa, The Type II Topp-Leone-G Power Series Distribution with Applications on Bladder Cancer , Journal of the Nigerian Society of Physical Sciences: Volume 4, Issue 3, August 2022
- Opeyemi O. Enoch, Catherine O. Alakofa , Lukman O. Salaudeen , Odd Order Integrator with Two Complex Functions Control Parameters for Solving Systems of Initial Value Problems , Journal of the Nigerian Society of Physical Sciences: Volume 5, Issue 1, February 2023
- B. M. Dyavappa, Energy distribution of an ion cloud in a quadrupole Penning Trap , Journal of the Nigerian Society of Physical Sciences: Volume 2, Issue 2, May 2020
- Shaymaa Mohammed Ahmed, Majid Khan Majahar Ali, Raja Aqib Shamim, Integrating robust feature selection with deep learning for ultra-high-dimensional survival analysis in renal cell carcinoma , Journal of the Nigerian Society of Physical Sciences: Volume 7, Issue 4, November 2025
- Ahmad Alhawarat, Sultanah Masmali, Shahrina Ismail, Hamid El Hor, A descent-safeguarded PRP-type conjugate gradient with global convergence and CUTEst benchmarks , Journal of the Nigerian Society of Physical Sciences: Volume 8, Issue 2, May 2026
- Chinwendu Emilian Madubueze, Kazeem A. Tijani, Elijah Iji Ajogi, Madumelu H. C. Madubueze, A mathematical model of cybercrime contagion: impact ofemployment on youth offending , Journal of the Nigerian Society of Physical Sciences: Volume 8, Issue 3, August 2026
- Wilson Nwankwo, Kingsley Ukhurebor, Investigating the Performance of Point to Multipoint Microwave Connectivity across Undulating Landscape during Rainfall , Journal of the Nigerian Society of Physical Sciences: Volume 1, Issue 3, August 2019
- Eli Danladi, M. Y. Onimisi, S. Garba, R. U. Ugbe, J. A. Owolabi, O. O. Ige, G. J. Ibeh, A. O. Muhammed, Corrigendum to "Simulation and Optimization of Lead-Based Perovskite Solar Cells with Cuprous Oxide as a P-type Inorganic Layer [J. Nig. Soc. Phys. Sci. 1 (2019) 72–81, https://doi.org/10.46481/jnsps.2019.13]" , Journal of the Nigerian Society of Physical Sciences: Volume 3, Issue 3, August 2021
You may also start an advanced similarity search for this article.
Most read articles by the same author(s)
- N. K. Olasunkanmi, D. T. Ogundele, V. T. Olayemi, W. A. Yahya, A. R. Olasunkanmi, Z. O. Yusuf, S. A. Aderoju, Assessing leachate contamination and groundwater vulnerability in urban dumpsites: a case study of the Ipata Area, Ilorin, Nigeria , Journal of the Nigerian Society of Physical Sciences: Volume 6, Issue 2, May 2024

