title: Interplay between Auger and ionization processes in nanocrystal quantum dots.
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.
authors.affiliation: Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 Munich, Germany.
authors.forename: Robert M
authors.initials: RM
authors.lastname: Kraus
authors.forename: Pavlos G
authors.initials: PG
authors.lastname: Lagoudakis
authors.forename: Josef
authors.initials: J
authors.lastname: Müller
authors.forename: Andrey L
authors.initials: AL
authors.lastname: Rogach
authors.forename: John M
authors.initials: JM
authors.lastname: Lupton
authors.forename: Jochen
authors.initials: J
authors.lastname: Feldmann
authors.forename: Dimitri V
authors.initials: DV
authors.lastname: Talapin
authors.forename: Horst
authors.initials: H
authors.lastname: Weller