Optimization of In x Ga 1−x N P-I-N Solar Cells: Achieving 21% Efficiency Through SCAPS-1D Modeling. - Abboudi, Hassan; Belaid, Walid; En-nadir, Redouane; Ez-zejjari, Ilyass; Zouini, Mohammed; Sali, Ahmed; El Ghazi, Haddou (Crystals (2073-4352), 2025)