The Oxford team has demonstrated that perovskite cells are just as efficient if they are constructed in the same flat design, and using the same method—known as vapor deposition—as cheap thin-film silicon cells. “Having started with a complicated nanostructure, we’ve reduced it to a thin film,” Snaith says. “It’s amusing, I agree!”
http://news.sciencemag.org/physics/2013/09/flat-out-major-advance-emerging-solar-cell-technology
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