Many people think solar energy has wider potential than just the gridscale electricity produced in standard solar farms
has had a good crisis. In many parts of the world skies clear of pollution have helped photovoltaic power stations, which convert light into electricity, become more productive and reliable. Declining demand, meanwhile, has seen coal- and gas-fired stations taken offline. In Britain, on April 20th, solar generation peaked at 9.7 gigawatts. At the moment this happened that represented almost 30% of the country’s electricity supply—ten times the usual proportion.
Gradually, costs came down, efficiencies tripled to 17-20% and applications widened, until the point, now arrived at, where grid managers faced with surplus capacity are preferring solar to fossil-fuel generation. For all that they have got better in detail, though, solar cells have stayed the same in principle.
Another promising group of materials for making new types of solar cells are perovskites. The original substance of this name is a mineral, calcium titanium oxide, discovered in the Ural mountains in 1839 and called after Count Lev Perovski, a Russian mineralogist. As is often the way with minerals, though, the basic crystal lattice involved can be created from many sorts of atoms. “Perovskite” has thus now become a generic term for any of these variants.
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