Almahsen, Sarowr Basm, and Ghaleb Ali Al-Dahash. “Breakthrough 31.25% Efficiency in Lead-Free Double Perovskite Tandem Solar Cells: A Novel Cs₂AgBi₀.₇₅Sb₀.₂₅Br₆ CsSnI₃ Design via SCAPS-1D Simulation”. Journal of Theoretical and Applied Physics, vol. 20, no. 4, Aug. 2026, https://doi.org/10.57647/jtap.2026.2004.04.