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Singlet fission photovoltaics: splitting one photon to two electrons

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If you have a question about this talk, please contact Dr. Felix Deschler.

Conventional solar cells generate one electron for each absorbed photon. Any excess photon energy above the bandgap is wasted as heat. This leads to the Shockley-Queisser efficiency limit of 34% for solar cells containing a single semiconductor junction. Singlet exciton fission splits a high-energy singlet exciton into a pair of low-energy triplets. In solar cells, it promises to double the electricity generated from the blue part of the sunlight, breaking the single junction efficiency limit. ​Moving toward the goal of developing solar cells that overcome the Shockley-Queisser limit, we demonstrate fission-based photovoltaic cells that produce more than one electron per incident photon. It is the first time that any solar cell has shown the photon-to-electron conversion efficiency exceeding 100% in the visible spectrum. Continuous advances in fission-based photovoltaics require understanding the fundamental mechanism governing singlet fission. We present a universal model that successfully predicts the rate of fission and confirm that fission is robust to variations in molecular morphology.

This talk is part of the Optoelectronics Group series.

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