Interplay between Auger and ionization processes in nanocrystal quantum dots |
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Authors: | Kraus Robert M Lagoudakis Pavlos G Müller Josef Rogach Andrey L Lupton John M Feldmann Jochen Talapin Dimitri V Weller Horst |
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Institution: | Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universit?t München, Amalienstr. 54, 80799 Munich, Germany. |
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Abstract: | We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates. |
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