How Flawed Crystals Are Powering the Future of Solar Energy

Defect-filled lead-halide perovskites rival silicon solar cells because domain walls inside the material separate and guide charges. Researchers visualized these charge-transport networks using a novel silver-staining technique, resolving a long-standing efficiency mystery. Perovskites made from lead halides are produced through low-cost solution processing and contain many defects. Even so, they convert sunlight into electricity with [...]