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These flexible solar cells bring us closer to kicking the fossil-fuel habit

No solar material has managed to supplant silicon. Perovskites, which are far cheaper and can be made into flexible modules, could change that.
by James Temple

Last December, researchers in a lab in Oxford, England, shined a sun lamp onto a tiny solar cell, only about one centimeter square.

The device was actually two cells, stacked one atop the other. The bottom one was made of the type of silicon used in standard solar panels. But the top was perovskite, a material with a crystal structure that’s particularly adept at turning light into electricity.


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