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Physicists Control Electrons at Femtosecond Timescales
January 22, 2016 | MITEstimated reading time: 4 minutes
Ultimately, he says these results may help to improve solar cells and energy harvesting devices by enabling them to capture and use more photo-excited electrons.
“Modern solar cells work such that if a photon comes and can be absorbed by silicon, it contributes to current in your photovoltaic device,” Jarillo-Herrero says. “If the light consists of lower-energy infrared photons, those are not absorbed by silicon. That limits seriously the efficiency of silicon solar cells. Now with our device, in principle you can absorb many lower-energy photons, those that silicon just lets through, such that the accumulation of that energy can contribute to a current in your electrical circuit. This is a mechanism by which you could think of doing it.”
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