Silicon solar cells currently dominate the global market with a power conversion efficiency (PCE) of approximately 26%, close to the theoretical maximum of 29%. However, to surpass this efficiency limit, the next frontier in solar energy technology lies in tandem solar cells (TSC). By integrating high-bandgap materials like perovskite with traditional silicon cells, tandem configurations enhance efficiency per unit area without significantly increasing costs, positioning them as a promising solution for achieving higher efficiencies in solar energy conversion. Four-terminal (4-T) perovskite / silicon (Si) TSCs have gained significant attention in the quest for more efficient and scalable solar energy solutions. These cells are particularly important because of the differing lifetimes between the top perovskite solar cell (PSC) and the bottom silicon cell. By allowing for the independent optimization of the top and bottom sub-cells, 4-T TSCs provide a promising pathway to enhance overall efficiency without compromising long-term stability. In the Hybrid Solar Cell (HSC) Laboratory of NCPRE, led by Prof. Dinesh Kabra, we fabricated near-infrared transparent (NIRT) PSCs for the applications of four-terminal (4-T) perovskite/silicon TSCs. The silicon solar cell technology is already well-established for commercial availability, we have focused on enhancing the top PSC technology, specifically by improving its scalability, stability, and efficiency. A major focus of the research has been on passivation engineering, optimization of the absorber layer thickness, and advancements in electrode design. A key aspect of the work involved optimizing the passivating interlayer for perovskite and electron transport layer within the p-i-n device architecture, which uses a wide bandgap (1.67 eV) perovskite absorber. By optimizing the passivation layer, the NCPRE researchers were able to improve the PCE of the NIRT PSCs to ~ 19%. NIRT-PSC devices exhibit good stability. Furthermore, combining the optimized perovskite cells with silicon has resulted in a remarkable 4-T tandem solar cell PCE of 29.14%, underscoring the potential of perovskite-silicon tandem configurations in driving future advancements.