Improving PCE of Lead Free, Organic, Inorganic, Metal Halide Bilayer Perovskite Solar Cells Through Optimization of Bandgap, Defect Density and Electron Affinity with Different ETLs. - Mustafizur Rahman; Tufayel Ahmed; Maher Ali Rusho; Md Juned Hussen; Mohammad Minhaz Uddin; Md Rayhan Chowdhury; Abu Mukaddim Rahi; Md. Khurshid Jahan (ICECET, 2025)