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dc.contributor.authorSun, Jingya
dc.contributor.authorYu, Weili
dc.contributor.authorUsman, Anwar
dc.contributor.authorIsimjan, Tayirjan T.
dc.contributor.authorDel Gobbo, Silvano
dc.contributor.authorAlarousu, Erkki
dc.contributor.authorTakanabe, Kazuhiro
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2015-08-03T11:47:38Z
dc.date.available2015-08-03T11:47:38Z
dc.date.issued2014-02-20
dc.identifier.issn19487185
dc.identifier.pmid26270833
dc.identifier.doi10.1021/jz5000512
dc.identifier.urihttp://hdl.handle.net/10754/563400
dc.description.abstractWe explored biexciton generation via carrier multiplication (or multiple-exciton generation) by high-energy photons and by multiple-photon absorption in Ag2S quantum dots (QDs) using femtosecond broad-band transient absorption spectroscopy. Irrespective of the size of the QDs and how the multiple excitons are generated in the Ag2S QDs, two distinct characteristic time constants of 9.6-10.2 and 135-175 ps are obtained for the nonradiative Auger recombination of the multiple excitons, indicating the existence of two binding excitons, namely, tightly bound and weakly bound excitons. More importantly, the lifetimes of multiple excitons in Ag 2S QDs were about 1 and 2 orders of magnitude longer than those of comparable size PbS QDs and single-walled carbon nanotubes, respectively. This result is significant because it suggests that by utilizing an appropriate electron acceptor, there is a higher possibility to extract multiple electron-hole pairs in Ag2S QDs, which should improve the performance of QD-based solar cell devices. © 2014 American Chemical Society.
dc.publisherAmerican Chemical Society (ACS)
dc.subjectAg2S quantum dots
dc.subjectAuger recombination
dc.subjectexciton multiplication
dc.subjectfemtosecond broad-band transient spectroscopy
dc.titleGeneration of multiple excitons in Ag2S quantum dots: Single high-energy versus multiple-photon excitation
dc.typeArticle
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentChemical Science Program
dc.contributor.departmentMaterials Science and Engineering Program
dc.contributor.departmentCatalysis for Energy Conversion (CatEC)
dc.identifier.journalThe Journal of Physical Chemistry Letters
kaust.personYu, Weili
kaust.personUsman, Anwar
kaust.personIsimjan, Tayirjan T.
kaust.personAlarousu, Erkki
kaust.personTakanabe, Kazuhiro
kaust.personMohammed, Omar F.
kaust.personSun, Jingya
kaust.personDel Gobbo, Silvano


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