......perovskites - named after Count Lev Alekseevich von Perovski, a 19th Century Russian mineralogist.
These have a particular crystal structure that is good for solar absorption. Thin films, around 300 nanometres (much thinner than a human hair) can be made inexpensively from solutions - allowing them to be easily applied as a coating to buildings, cars or even clothing.
....made from two materials, they get to break through the Shockley-Queisser limit.
The silicon absorbs the red band of the visible light spectrum, and the perovskite the blue bit, giving the tandem bigger efficiency than either material alone.
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