Impact of Cs Substitution on the Optoelectronic Properties of MASnI3 Perovskite: A DFT studyAbdelhafid Najim, Lhouceine Moulaoui, Omar Bajjou and Khalid RahmaniE3S Web Conf., 680 (2025) 00043DOI: https://doi.org/10.1051/e3sconf/202568000043