The article discusses the development of triple cation perovskite solar cells, which incorporate cesium (Cs) in addition to methylammonium (MA) and formamidinium (FA) to enhance stability, reproducibility, and efficiency. The addition of Cs improves thermal stability, reduces phase impurities, and enhances the crystallinity of the perovskite films, leading to more uniform grains and better device performance. The triple cation composition, specifically Cs0.5MA0.83FA0.83Pb(I0.83Br0.17)3, achieves a stabilized power conversion efficiency (PCE) of 21.1% and maintains an output of 18% after 250 hours under operational conditions. This work highlights the potential of triple cation mixtures as a novel strategy for improving the industrialization of perovskite solar cells by enhancing stability and reproducibility.The article discusses the development of triple cation perovskite solar cells, which incorporate cesium (Cs) in addition to methylammonium (MA) and formamidinium (FA) to enhance stability, reproducibility, and efficiency. The addition of Cs improves thermal stability, reduces phase impurities, and enhances the crystallinity of the perovskite films, leading to more uniform grains and better device performance. The triple cation composition, specifically Cs0.5MA0.83FA0.83Pb(I0.83Br0.17)3, achieves a stabilized power conversion efficiency (PCE) of 21.1% and maintains an output of 18% after 250 hours under operational conditions. This work highlights the potential of triple cation mixtures as a novel strategy for improving the industrialization of perovskite solar cells by enhancing stability and reproducibility.