Tin halide perovskites (Sn-HPs) are emerging as eco-friendly alternatives to lead-based perovskites due to their reduced environmental impact. However, Sn-HP-based perovskite solar cells (PSCs) face issues like rapid crystallization, defects, low stability, and high moisture sensitivity, impacting efficiency and longevity. According to a recent study led by Associate Professor Dong-Won Kang from Chung-Ang University, South Korea, introducing 4-Phenylthiosemicarbazide (4PTSC) during Sn-HP production offers a solution. The study claims 4PTSC functions as a coordination complex and reducing agent, enhancing crystal growth control and stability. The modified devices achieved a peak efficiency of 12.22%, with an open-circuit voltage of 0.94 V, and showed excellent long-term stability, maintainingnearly 100% efficiency after 500 hours and about 80% after 1200 hours. This advancement suggests improved cost-effectiveness and durability for Sn-HPs, supporting the broader adoption of renewable energy technologies.