Multiple exciton generation for photoelectrochemical hydrogen evolution reactions with quantum yields exceeding 100%
Yan Y, Crisp R, Gu J, Chernomordik BD, Pach GF, Marshall AR, Turner JA, Beard MC (2017)
Publication Status: Published
Publication Type: Journal article
Publication year: 2017
Journal
Publisher: NATURE PUBLISHING GROUP
Book Volume: 2
Article Number: ARTN 17052
Journal Issue: 5
Abstract
Multiple exciton generation (MEG) in quantum dots (QDs) has the potential to greatly increase the power conversion efficiency in solar cells and in solar-fuel production. During the MEG process, two electron-hole pairs (excitons) are created from the absorption of one high-energy photon, bypassing hot-carrier cooling via phonon emission. Here we demonstrate that extra carriers produced via MEG can be used to drive a chemical reaction with quantum efficiency above 100%. We developed a lead sulfide (PbS) QD photoelectrochemical cell that is able to drive hydrogen evolution from aqueous Na2S solution with a peak external quantum efficiency exceeding 100%. QD photoelectrodes that were measured all demonstrated MEG when the incident photon energy was larger than 2.7 times the bandgap energy. Our results demonstrate a new direction in exploring high-efficiency approaches to solar fuels.
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APA:
Yan, Y., Crisp, R., Gu, J., Chernomordik, B.D., Pach, G.F., Marshall, A.R.,... Beard, M.C. (2017). Multiple exciton generation for photoelectrochemical hydrogen evolution reactions with quantum yields exceeding 100%. Nature Energy, 2(5). https://doi.org/10.1038/nenergy.2017.52
MLA:
Yan, Yong, et al. "Multiple exciton generation for photoelectrochemical hydrogen evolution reactions with quantum yields exceeding 100%." Nature Energy 2.5 (2017).
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