Convention solar cells have a maximum external quantum efficiency (EQE) of 100%: for every photon incident on the cell, they generate one photoexcited electron. In recent years, scientists have sought to improve on this by developing materials that “free up” more than one electron for every photon they absorb. A team led by physicist Chinedu Ekuma of Lehigh University in the US has now achieved this goal, producing a material with an EQE of up to 190% – nearly double that of silicon solar cells.
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