| DOI | Resolve DOI: https://doi.org/10.1021/jz401896k |
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| Author | Search for: Fuzell, Jack; Search for: Thibert, Arthur; Search for: Atkins, Tonya M.; Search for: Dasog, Mita; Search for: Busby, Erik; Search for: Veinot, Jonathan G. C.1; Search for: Kauzlarich, Susan M.; Search for: Larsen, Delmar S. |
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| Affiliation | - National Research Council of Canada. Security and Disruptive Technologies
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| Format | Text, Article |
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| Subject | 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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| Abstract | 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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| Publication date | 2013 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21271813 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7dbcb73a-4507-4d08-962e-b3f73d77a0fa |
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| Record created | 2014-04-22 |
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| Record modified | 2020-04-22 |
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