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
- Thirumalai A, Muthunagai K, Ritu Agarwal, Pre-functions and Extended pre-functions of Complex Variables , Journal of the Nigerian Society of Physical Sciences: Volume 5, Issue 2, May 2023
- Chuchu Liang, Majid Khan Majahar Ali, Lili Wu, A novel multi-class classification method for arrhythmias using Hankel dynamic mode decomposition and long short-term memory networks , Journal of the Nigerian Society of Physical Sciences: Volume 7, Issue 2, May 2025
- Sunday Emmanuel Fadugba, Solution of Fractional Order Equations in the Domain of the Mellin Transform , Journal of the Nigerian Society of Physical Sciences: Volume 1, Issue 4, November 2019
- M. A. Lala, O. A. Adesina, O. J. Odejobi, J. A. Sonibare, Theoretical Air Requirement and Combustion Flue Gases Analysis for Indigenous Biomass Combustion , Journal of the Nigerian Society of Physical Sciences: Volume 4, Issue 4, November 2022
- A. A. Ibiyemi, G. T. Yusuf, O. Akirinola, M. Orojo, B. Osuporu, J. Lawal, Investigating the magnetic domain structure and photonics characters of Singled Phased hard ferromagnetic Ferrite MFe3O4 (M= Co2+, Zn2+, Cd2+) Compounds , Journal of the Nigerian Society of Physical Sciences: Volume 6, Issue 1, February 2024
- Anthony Anya Okeke, Nur Nadiah Abd Hamid, Wen Eng Ong, Muhammad Abbas, A numerical algorithm based on extended cubic B-spline functions for solving time-fractional convection-diffusion-reaction equation with variable coefficients , Journal of the Nigerian Society of Physical Sciences: Volume 7, Issue 1, February 2025
- Dyavappa B M, Velocity distribution of 43Ca+ion cloud in the low temperature limit in a quadrupole Penning Trap , Journal of the Nigerian Society of Physical Sciences: Volume 3, Issue 1, February 2021
- Terver Daniel, F. Eriba-Idoko, J. O. Tsor, S. T. Kungur, E. O. Enokela, F. Gbaorun, E. C. Hemba, A. A. McAsule, N. S. Akiiga, P. O. Ushie, Effects of Repeated Frying on Physical Properties of Cooking Oil obtained from Local Markets in Makurdi Metropolis, Benue State, Nigeria. , Journal of the Nigerian Society of Physical Sciences: Volume 3, Issue 4, November 2021
- G. Kamarajan, D. Benny Anburaj, V. Porkalai, A. Muthuvel, G. Nedunchezhian, Effect of temperature on optical, structural, morphological and antibacterial properties of biosynthesized ZnO nanoparticles , Journal of the Nigerian Society of Physical Sciences: Volume 4, Issue 3, August 2022
- Jinta Jose, Bobin George, Rajesh K. Thumbakara, Sijo P. George, Understanding normal and restricted normal products in soft directed graphs , Journal of the Nigerian Society of Physical Sciences: Volume 6, Issue 3, August 2024
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

