Scientists at the University of Surrey,the National Physical Laboratory and the University of Sheffield, has found a way to make perovskite solar cells last longer. They discovered that adding aluminium oxide (Al₂O₃) nanoparticles helps stop iodine from leaking, which usually causes damage. Tests showed that these improved solar cells worked well for over 1,530 hours, much longer than the 160 hours seen in regular cells. The nanoparticles has made the structure stronger, improved conductivity, and added a protective layer against moisture.This research could make perovskite solar cells last longer, cost less, and be used more. As more people rely on renewable energy, these improvements could make solar power more reliable and reduce the use of fossil fuels.