Researchers at University College London have developed perovskite-based solar cells that achieve record indoor efficiency, offering a sustainable alternative to disposable batteries in everyday electronics. This figure is several times higher than traditional solar panels, which typically struggle to perform effectively in indoor environments. By growing defect-free crystals, researchers eliminated electron-trapping sites, boosting both efficiency and stability of the solar cells. Tests revealed that the solar cells retained 92% of their initial power output after 100 days of continuous use. The primary advantage of this innovation is its ability to replace batteries in small electronics.