Journal: | Revista mexicana de física |
Database: | PERIÓDICA |
System number: | 000460546 |
ISSN: | 0035-001X |
Authors: | Benmekideche, N1 Fetah, S2 Belgoumri, G1 Bentabet, A1 Benmakhlouf, A1 |
Institutions: | 1Universite Mohamed El Bachir El Ibrahimi, Bordj-Bou Arréridj. Argelia 2Universite Mohamed Boudiaf, Faculty of science, M'Sila. Argelia |
Year: | 2022 |
Season: | Nov-Dic |
Volumen: | 68 |
Number: | 6 |
Country: | México |
Language: | Inglés |
Document type: | Artículo |
Approach: | Analítico, teórico |
English abstract | In this paper, we studied the structural, electronic and some optical properties of KGaQ2 (Q = S, Se) and AGaTe2 (A = K, Cs) crystals using the pseudopotential plane-wave (PP-PW) method based on density functional theory (DFT), the generalized gradient approximation (GGA) parameterized by Perdew-Burke-Ernzerhof (GGA-PBE) is used for the exchange-correlation (XC) potential. We also use the hybrid density functional (HSE06) to study the electronic structures of these materials. Our results for the equilibrium lattice constants (a, b and c), angle β are in good agreement with experiment data. The electronic structure calculation suggested that crystals are direct-gap semiconductors, employing both the Perdew-Burke-Ernzerhof (PBE) and the hybrid (HSE06) functionals. We note that the hybrid density functional improved the value of band gap, and that the studied compounds are semiconductors with wide band-gaps. We have also predicted the optical properties; the refractive index, the reflection coefficient and dielectric constant on high frequencies |
Disciplines: | Física y astronomía |
Keyword: | Física, Ingeniería de materiales, Teoría del funcional de la densidad (DFT), Parametrizado por Perdew-Burke-Ernzerhof, Funcional de densidad híbrido, Propiedades estructurales, Propiedades electrónicas, Constantes ópticas |
Keyword: | Physics, Materials engineering, Density functional theory (DFT), Parameterized by Perdew-Burke-Ernzerhof (GGA-PBE), Hybrid density functional, Structural properties, Electronic properties, Optical constants |
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