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Solar hydrogen generation: Exceeding 100% efficiency

Multiple exciton generation, in which two electron–hole pairs are generated from the absorption of one high-energy photon, has been demonstrated to improve efficiency in quantum-dot-based solar cells. Now, a photoelectrochemical system using PbS quantum dots is shown to drive hydrogen evolution with external quantum efficiency over 100%.

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Figure 1: Multiple-exciton generation (MEG).
Figure 2: Photoelectrochemical hydrogen evolution from aqueous Na2S solution.

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Correspondence to Mikhail Zamkov.

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Zamkov, M. Solar hydrogen generation: Exceeding 100% efficiency. Nat Energy 2, 17072 (2017). https://doi.org/10.1038/nenergy.2017.72

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