Chercheur

Teachers Login Form

 

Admin

Pupils Login Form

 



First-principles calculations of the structural, electronic and optical properties of In1−xBxAsyP1−y quaternary alloys lattice matched to InP and BeS

Auteurs : O. Nemiri, A. Boumaza, K. BOUBENDIRA, S. Ghemid, H. Meradji, F. El Haj Hassan
Année : 2015
Domaine : Physique
Type : Publication
Revue : Materials Science in Semiconductor Processing
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : FP-LAPW, DFT, In1−xBxAsyP1−y quaternary alloys, Lattice matched

Résumé :

The structural, electronic, and optical properties of the cubic In1−xBxAsyP1−y quaternary alloys lattice matched to InP and BeS have been investigated by using the full-potential linearized augmented plane wave (FP-LAPW) method within the density functional theory (DFT). The generalized gradient approximation (GGA) of Wu and Cohen was used as the exchange correlation potential to calculate the structural and electronic properties. In addition, the alternative GGA proposed by Engel and Vosko and the modified Becke–Johnson potential are utilized to calculate the electronic properties. The computed structural and electronic properties of the binary compounds are in good agreement with the available experimental and theoretical data. For the alloys, non-linear variations of composition x and y with the lattice constant, bulk modulus, direct, indirect band gap, dielectric constant and refractive index are found. All the compounds are direct band gap excluding BP and BAs. The energy band gap of In1−xBxAsyP1−y quaternary alloys lattice matched to InP and BeS substrates is computed. Finally, the band gap of our materials is less than 3.1 eV. Thus the In1−xBxAsyP1−y quaternary alloys may possibly be used in visible light devices.