Efficient: The two-layer perovskite solar cells can achieve higher efficiencies than silicon cells. « Perovskite-based tandem solar cell. Image by Empa, Swiss Federal Laboratories for Materials Science and Technology
Roof tiles are becoming a thing of the past: Today, more and more Swiss roofs boast large black and blue rectangles that convert sunlight into electricity. The blueish color comes from silicon crystals, as the majority of solar cells available today are based on this semiconductor material. But silicon is not the only way to make a solar cell — and possibly not even the best.
Solar cells made from other materials offer a way to overcome this limitation, says Empa researcher Fan Fu. The group leader in the Laboratory for Thin Films and Photovoltaics is researching highly efficient solar cells made of perovskite. A single perovskite cell alone does not achieve a higher efficiency, because perovskite as a semiconductor also has a limited band gap.
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