Silicon solar cells currently dominate the global market as the most widely used and effective solar cell technology. However, to achieve higher efficiencies, the next frontier in solar PV lies in tandem solar cells (TSC). TSCs combine two types of solar cells, one with a wide bandgap like perovskites and another with a narrow bandgap like silicon. Four- terminal (4-T) perovskite/silicon (Si) TSCs are useful because they allow for the independent optimization of the top and bottom sub-cells, thus providing a promising pathway to enhance overall efficiency without compromising long-term stability. At the Hybrid Solar Cell (HSC) Laboratory at NCPRE, under the guidance of Prof. Dinesh Kabra, we have been focused on developing near-infrared transparent (NIRT) perovskite solar cells (PSCs) for four-terminal (4-T) perovskite/silicon TSCs. Core developments include: (i) Passivation engineering for improved interface quality, (ii) Optimization of absorber layer thickness for NIRT PSC, (iii) Significantly improved device stability, and (iv) Electrode design enhancements for scalability. We have achieved 4-T tandem solar cell efficiency of 30.18% (currently under communication for publication). Results for a 29.14% cell (mentioned earlier in the February Newsletter) have now been published in May 2025, and are available in Solar RRL (DOI: https://doi.org/10.1002/solr.202500163). A patent has been filed to protect the intellectual property generated: “Ultrathin Insulating Passivation Layer For Optoelectronic Devices” (Patent Application: 202421006885).