DOI | Trouver le DOI : https://doi.org/10.1021/jz401896k |
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Auteur | Rechercher : Fuzell, Jack; Rechercher : Thibert, Arthur; Rechercher : Atkins, Tonya M.; Rechercher : Dasog, Mita; Rechercher : Busby, Erik; Rechercher : Veinot, Jonathan G. C.1; Rechercher : Kauzlarich, Susan M.; Rechercher : Larsen, Delmar S. |
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Affiliation | - Conseil national de recherches du Canada. Technologies de sécurité et de rupture
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Format | Texte, Article |
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Sujet | Excitation power; Exciton dynamics; Meta-stable state; Silicon nanocrystals; Silicon nanoparticles; State-filling; Transient absorption spectroscopies; Ultra-fast dynamics; Excited states; Optical waveguides; Excitons |
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Résumé | The ultrafast exciton photodynamics of red-emitting and blue-emitting colloidal Si nanocrystals are contrasted under low (1.5 mJ/cm2) and high (9.1 mJ/cm2) excitation powers with broadband transient absorption spectroscopy. While the low-power initiated transient signals differ strongly for the two samples, the high-power signals exhibit similar nonmonotonic kinetics, resulting in a new population formed on a 10 to 30-ps time scale with a sample independent spectrum and decay kinetics. This phenomenon is ascribed to the saturation of low-density red-emitting and blue-emitting traps via a state-filling mechanism to populate new meta-stable states at higher excitation powers. The states responsible for blue emission and high-power populations are ascribed to traps from low-density nitrogen and oxygen impurities, respectively, and share similar charge-transfer character with the silicon nanocrystal core. © 2013 American Chemical Society. |
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Date de publication | 2013 |
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Dans | |
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Langue | anglais |
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Publications évaluées par des pairs | Oui |
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Numéro NPARC | 21271813 |
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Exporter la notice | Exporter en format RIS |
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Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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Identificateur de l’enregistrement | 7dbcb73a-4507-4d08-962e-b3f73d77a0fa |
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Enregistrement créé | 2014-04-22 |
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Enregistrement modifié | 2020-04-22 |
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