In bulk semiconductors, the absorption of one photon of energy greater than the bandgap leads to one exciton. In quantum dots, however, it could be possible to create multiple excitons from a single high-energy photon, a finding with dramatic implications for the efficiencies of devices such as solar cells.
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Guyot-Sionnest, P. A new quantum state?. Nature Mater 4, 653–654 (2005). https://doi.org/10.1038/nmat1473
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DOI: https://doi.org/10.1038/nmat1473
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