Lightweight and flexible, crystalline silicon solar cells could power airships and drones, or be easily integrated into electric vehicles and building facades. The new flexible solar cells are just as efficient as their conventional rigid counterparts. The silicon wafers used to make the cells are mechanically brittle. Scientists treated wafers using two techniques to reduce brittleness. One was a wet chemical process, involving acid, and the other a dry heat-based process. After the treatment, the wafers could be shaken without breaking, like sheets of flexible paper.
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