BARC/PUB/2011/0773

 
 

Electronic properties and charge density of BexZn1-xTe alloys

 
     
 
Author(s)

Swarnkar, C. B.; Paliwal, U.; Patel, N. N.; Joshi, K. B.

Source

Bulletin of Materials Science, 2011. Vol. 34 (3): pp. 499-506

ABSTRACT

Electronic band structure calculations are performed for the BexZn1−xTe (0≤x≤1 in steps of 0·2) alloys following the empirical pseudopotential method. The alloying effects are modelled through the modified virtual crystal approximation. Throughout the composition, valence band maximum resides at the Γ point. The conduction band minimum, however, shifts from Γ to X point of symmetry when x = 0·27. The observed crossover from direct to indirect bandgap is well in accordance with the experimental observations. Effect of alloying on the density of states is also discussed. The charge density distribution along a few major planes is computed and discussed. The electronic band structure related parameters like bandwidths, bandgaps and ionicity are reported and compared with experimental data wherever available. We also give estimates of cohesive energy and bulk modulus for the alloys.

 
 
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