Almost every solar panel in the world is made of silicon, and silicon is close to the limit of what it can do.
Perovskite is the material the industry has been watching for a decade: it converts light more efficiently, it can be processed at low temperatures, and it can be laid onto glass or onto a flexible sheet rather than requiring a rigid wafer.
The problem has never been efficiency.
Perovskite cells have broken record after record in laboratories.
The problem is that they degrade, sometimes within months, under heat, moisture and ultraviolet light, which is precisely what a solar panel spends its life in.
