2025. OPTIMIZING LEAD-FREE CsGeI3 PEROVSKITE SOLAR CELLS: SCAPS-1D SIMULATION ACHIEVING 27.34% EFFICIENCY THROUGH LAYER THICKNESS AND BAND ALIGNMENT TUNING. Kashf Journal of Multidisciplinary Research. 2, 09 (Sep. 2025), 241–251. DOI:https://doi.org/10.71146/kjmr632.