Computational study of structural, thermal and electronic properties of the chalcopyrites AlAgX2 (X=S,Se,Te)
Presented by Mr. Guy Moise DONGHO NGUIMDO on 10 Jul 2014 from 14:20 to 14:40
Type: Oral Presentation
Track: Track G - Theoretical and Computational Physics
First principles DFT calculations of structural, thermal and electronic properties of the bulk chalcopyrites AlAgX2 (X=S,Se,Te) are performed using LDA, GGA and MettaGGA-MBJ approximations. The optimized structure and lattice constants are obtained after a full relaxation of the structure while equilibrium volume, bulk moduli and its derivatives are extracted by fitting the Birch Murnanghan equation of state. Cohesive and formation energies and phonon frequencies are used to predict the stability of the structure. Thermal properties including free energy, heat capacity and entropy are also discussed. A systematic study of the density of state, the bandgap and the band structure is done for the different approximations. We found that the MettaGGA-MBJ calculations give the most accurate fundamental gaps when compared to the experimental data.
Prof. Daniel P. Joubert, Email:email@example.com, Phone:0117176804. School of Physics, Wits University.