The first effective use of lead acetate as a precursor in generating formamidinium-caesium perovskite solar cells has established a new avenue to creating durable, efficient perovskite photovoltaics at the industrial scale. It can make ultra-smooth thin films with fewer flaws; the chemical compound lead acetate has emerged as a possible alternative precursor. Until now, lead acetate had only been utilised to generate methyl ammonium or cesium-based perovskites, which are relatively unstable and unsuitable for real-world applications. Because of their improved stability, perovskites produced from formamidinium and cesium are a better choice for commercial usage. Attempts to synthesize them before using lead acetate as a precursor failed. Through X-ray diffraction and nuclear magnetic resonance spectroscopy, they identified the need to use ammonium as a volatile cation (positively charged ion) at a critical stage. A Mini prototype solar panel featuring these cells achieved 18.8% efficiency. The large-area perovskite layer was fabricated in an ambient atmosphere and was made via a single-step blade coating, demonstrating its potential viability for industrial-scale manufacturing.