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Caption
Iodine atoms, which surround lead atoms in a perovskite solar cell material studied at SLAC, respond to light in a surprising manner: Within 10 trillionths of a second after a light pulse, iodine atoms rotate around every lead atom as if they are moving on the surface of a sphere with the lead atom at the center. These motions could potentially explain the material's high efficiency in converting light into electricity.
Credit
SLAC National Accelerator Laboratory
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