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.
Read more on technologyreview.com.