Chowdhury , Omkar, and Utsa Bhowmik. “Design and Optimization of Lead-Free Chalcogenide Perovskite Solar Cells: 30.64% Efficiency With MgHfS₃ Absorber”. SciEn Conference Series: Engineering, vol. 4, Aug. 2026, pp. 68-72, https://doi.org/10.38032/scse.2026.4.40.