First-Principles Investigation of Structural Stability and Optoelectronic Properties of Lead-Free CsSnₓGe₁₋ₓI₃ Mixed-Halide Perovskites for Advanced Optoelectronic Applications (S. Adebayo, A. A. Bamidele, M. K. Awodele, & A. O. Awodugba, Trans.). (2026). Nigerian Journal of Applied Physics, 2(2), 160-168. https://doi.org/10.62292/