Effect of hydrostatic pressure on opto-electronic, elastic and thermoelectric properties of the double perovskites Rb2SeX6(X=Cl,Br): a DFT study
Keywords:
Hydrostatic Pressure, Density Functional Theory, Double perovskite, Opto-electronic property, Thermoelectric propertyAbstract
Double perovskites find applications across a diverse range of situations and varying pressure conditions. In this work, Quantum ESPRESSO code with a plane wave basis set was used to study the opto-electronic, elastic, and thermoelectric properties of Rb2SeX6 (X=Cl, Br) double perovskites under hydrostatic pressure (0 - 8 GPa). Perdew-Burke-Ernzerhof for Solids (PBESol) with generalized gradient approximation (GGA) was used as exchange-correlation functional. The band gap values of the materials decrease under hydrostatic pressure. Rb2SeCl6 has a band gap value of 2.44 eV at 0 GPa, 2.21 eV at 2 GPa. Above 2 GPa, the material has a metallic nature. Rb2SeBr6 has a band gap value of 1.56 eV at 0 GPa, but has a metallic nature under hydrostatic pressure (2 GPa to 8 GPa). The optical properties results indicate that the materials exhibit maximum absorption, high reflectivity, low optical loss in the visible and ultraviolet regions, good optical conductivity, and a refractive index suitable for use in opto-electronic applications. The materials are confirmed to be mechanically stable under all the hydrostatic pressure values studied. Electrical conductivity, thermal conductivity, and Seebeck coefficient (S ) values of the studied materials increase with an increase in hydrostatic pressure and temperature. The maximum value of S for Rb2SeBr6 is 0.248 x 103 (m V/k), while for Rb2SeCl6, maximum S = 0.175 x 103 (m V/k). The positive values of S suggest that the predominant charge carriers of Rb2SeCl6/Br6 are holes. Also, Rb2SeBr6 has a figure of merit (ZT) value of 3.44, while for Rb2SeCl6, ZT = 1.07. Since the values of ZT are greater than unity, the two double perovskite materials have good ZT values for thermoelectric device engineering. The results also suggest that Rb2SeBr6 is a better thermoelectric material than Rb2SeCl6.
Published
How to Cite
Issue
Section
Copyright (c) 2024 A. A. Yahaya, W. A. Yahya, I. A. Rahmon

This work is licensed under a Creative Commons Attribution 4.0 International License.
How to Cite
Similar Articles
- A. P. Onatunji, O. M. Ajao, K. T. Amzat, L. A. Oladimeji, O. A. Olalude, Bayesian analysis of the effects of some identified risk factors of systolic pressure among pregnant women in Ogbomoso, Oyo State , African Scientific Reports: Volume 3, Issue 2, August 2024
- Nikita Phuza, Sibulele Moni, Iviwe Sigojo, Ayamnkele James, Mere Idamokoro, Leon van Niekerk, Anthropometric variables, physiological parameters and physical activity levels of undergraduate students from the University of Fort Hare, South Africa , African Scientific Reports: Volume 4, Issue 3, December 2025
- Gafari Abiola Adepoju, Muniru Olajide Okelola, Muhammed Adekilekun Tijani, Hybrid Optimization Technique for Solving Economic Dispatch Problem: A Case Study of Nigerian Thermal Power System , African Scientific Reports: Volume 1, Issue 2, August 2022
- M. M. Tanko, M. S. Liman, W. L. Lumbi, U. S. Aliyu, Spatial and Seasonal Estimation of Tropospheric Radio Refractivity in Nigeria , African Scientific Reports: Volume 1, Issue 1, April 2022
- Anthony Ugbedeojo Atumeyi, A. U. Itodo, R. Sha'Ato, R. A. Wuana, Physicochemical analysis and dissolution kinetics of Itakpe iron ore in acid, base and aqueous media , African Scientific Reports: Volume 4, Issue 1, April 2025
- Enoch Suleiman, Ahmed A. Khammash, Coding Matrices for Wreath Products of Groups , African Scientific Reports: Volume 2, Issue 2, August 2023
- Akpata Erhieyovwe, Ernest Ojegu, Aroghene Edison Enaibe, Application of modified analytical embedded atom method to the study of lattice vibration in bcc transitional metals , African Scientific Reports: Volume 4, Issue 3, December 2025
- A. D. Adeshola, S. O. Oladejo, A. O. Abdulkareem, G. R. Ibrahim, Factorization in Phase-Space Finite Geometry and Weak Mutually Unbiased Bases , African Scientific Reports: Volume 2, Issue 1, April 2023
- Emmanuel B. Oluwagbemi, Victor N. Enwemiwe, Ebenezer O. Ayoola, Clement C. Obi, John U. Okushemiya, Hilda Ufoegbune, Physicochemical characteristics of soil and water in electronic waste dump site, Alaba Lagos, Nigeria , African Scientific Reports: Volume 2, Issue 1, April 2023
- E. A. Kamba, E. A. Yerima, Gas-phase Photocatalytic Oxidation of 1-Hexene Using Heterogeneous Semiconductor Materials , African Scientific Reports: Volume 2, Issue 1, April 2023
You may also start an advanced similarity search for this article.

