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dc.contributor.authorSukhovatkin, V.
dc.contributor.authorHinds, S.
dc.contributor.authorBrzozowski, L.
dc.contributor.authorSargent, E. H.
dc.date.accessioned2016-02-25T12:56:54Z
dc.date.available2016-02-25T12:56:54Z
dc.date.issued2009-06-18
dc.identifier.citationSukhovatkin V, Hinds S, Brzozowski L, Sargent EH (2009) Colloidal Quantum-Dot Photodetectors Exploiting Multiexciton Generation. Science 324: 1542–1544. Available: http://dx.doi.org/10.1126/science.1173812.
dc.identifier.issn0036-8075
dc.identifier.issn1095-9203
dc.identifier.pmid19541992
dc.identifier.doi10.1126/science.1173812
dc.identifier.urihttp://hdl.handle.net/10754/597798
dc.description.abstractMultiexciton generation (MEG) has been indirectly observed in colloidal quantum dots, both in solution and the solid state, but has not yet been shown to enhance photocurrent in an optoelectronic device. Here, we report a class of solution-processed photoconductive detectors, sensitive in the ultraviolet, visible, and the infrared, in which the internal gain is dramatically enhanced for photon energies Ephoton greater than 2.7 times the quantum-confined bandgap Ebandgap. Three thin-film devices with different quantum-confined bandgaps (set by the size of their constituent lead sulfide nanoparticles) show enhancement determined by the bandgap-normalized photon energy, Ephoton/Ebandgap, which is a clear signature of MEG. The findings point to a valuable role for MEG in enhancing the photocurrent in a solid-state optoelectronic device. We compare the conditions on carrier excitation, recombination, and transport for photoconductive versus photovoltaic devices to benefit from MEG.
dc.description.sponsorshipThis publication was based on work supported in part by an award from the King Abdullah University of Science and Technology, by the Natural Sciences and Engineering Research Council of Canada, by the Canada Research Chairs, and by the Canada Foundation for Innovation and the Ontario Innovation Trust.
dc.publisherAmerican Association for the Advancement of Science (AAAS)
dc.titleColloidal Quantum-Dot Photodetectors Exploiting Multiexciton Generation
dc.typeArticle
dc.identifier.journalScience
dc.contributor.institutionUniversity of Toronto, Toronto, Canada
dc.date.published-online2009-06-18
dc.date.published-print2009-06-19


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