DFT and TB-mBJLDA studies of structural, electronic and optical properties of Hg1-xCdxTe and Hg1-xZnxTe



Document title: DFT and TB-mBJLDA studies of structural, electronic and optical properties of Hg1-xCdxTe and Hg1-xZnxTe
Journal: Revista mexicana de física
Database: PERIÓDICA
System number: 000447367
ISSN: 0035-001X
Authors: 1
1
1
1
Institutions: 1Universite des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Faculte de physique, Oran. Argelia
Year:
Season: Nov-Dic
Volumen: 67
Number: 6
Country: México
Language: Inglés
Document type: Artículo
Approach: Analítico, teórico
English abstract In this paper, the fundamental semiconductor properties of Hg1-xCdxTe and Hg1-xZnxTe are investigated by ab initio calculations based on the FPLAPW method. Structural properties have been calculated using LDA and GGA approximations. The electronic properties are studied using the LDA and GGA approximations and the potential TB-mBJLDA coupled with the lattice parameters aLDA and aGGA. The optical properties are determined from the optimal gap energies based on the TB-mBJLDA potential. Lattice parameters aLDA obtained by the LDA calculations predict values that are in good agreement with the experimental results and are better than those results obtained by the GGA calculations. The use of TB-mBJLDA potential coupled with the lattice parameter aGGA gives gap energy values in good agreement with the experimental results for all alloys except Hg1-xZnxTe (x = 0.5,0.75) where the (TB-mBJLDA+aLDA) is more suitable. Optical constants are calculated from the dielectric function in the energy range (0-30 eV). The spectrum of real and imaginary parts of the dielectric function, the energy loss function, the refractive index, the extinction coefficient, the absorption coefficient, and the reflectivity show that optical properties of Hg1-xCdxTe are comparable to those of Hg1-xZnxTe. Our results are found to be in reasonable agreement with existing data reported in the literature
Disciplines: Física y astronomía
Keyword: Optica,
Ab initio,
Brecha de energía,
Propiedades ópticas
Keyword: Optics,
Ab initio,
Gap energy,
Optical properties
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