Theoretical analysis of linear optical properties of PbSxSe1-x (X=0.5)

The optical properties of x = 0.5 value for of PbSxSe1-x ternary semiconductor alloys are calculated from the real and imaginary part of the dielectric function by using pseudopotential density functional method within its local density approximation (LDA) and a scissors approximation. A direct band gap of 0.49 eV at Г is obtained for PbS0.5Se0.5.The starting value of absorption for PbSxSe1-x alloy of x = 0.5 semiconductor alloy is 0.49 eV. The energy loss function maximum has value 15.6A eV. Our results are in agreement with the available theoretical data in the literatures.