Merabet, M.; Bouchama, I.; Chihi, T.; Foudia, L.; Saidi, F.; Bouarissa, N. Ab Initio Study of the Effect of Sulphur Concentration on the Structural, Electronic and Optical Properties of CuIn(Se1-xSx)2 Compound Using Generalized Gradient Approximation. Eng. Technol. Appl. Sci. Res. 2025, 15, 24026-24034.