Bochra Saria et al. 2026. Numerical Optimization of Cd-Free CZTSe Kesterite Solar Cells with Tunable Zn(O,S) Buffer Layers Using Silvaco ATLAS. International Journal of Computational and Experimental Science and Engineering. 12, 3 (Mar. 2026). DOI:https://doi.org/10.22399/ijcesen.5455.