Ultrafast Electron−Hole Dynamics in Core/Shell CdSe/CdS Dot/Rod Nanocrystals
Maria Grazia Lupo(Politecnico di Milano), Fabio Della Sala(Politecnico di Milano), Luigi Carbone(Politecnico di Milano), M. Zavelani–Rossi(Politecnico di Milano), Angela Fiore(Politecnico di Milano), Larry Lüer(Politecnico di Milano), Dario Polli(Politecnico di Milano), R. Cingolani(Politecnico di Milano), Liberato Manna(Politecnico di Milano), Guglielmo Lanzani(Politecnico di Milano)
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Abstract
We investigated the transient bleaching and absorption of the asymmetric core/shell CdSe/CdS nanorods using the pump-probe technique. We observed ultrafast carrier relaxation and identified hole localization dynamics with 650 +/- 80 fs time constant. Upon pumping the CdSe core, we found an intense bleaching signal in the CdS spectral region, which we assigned to the delocalization of the electronic wave function on the basis of envelope-function theoretical calculations.
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