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Ultrafast dynamics of excitons and charge carriers in semiconductor nanocrystals probed by femtosecond optical spectroscopy
Elsa Cassette
Mardi 12/12/2017, 10h30-12h00
Salle de réunion LSI, Bât.83, Ecole Polytechnique, Palaiseau

The development of ultrathin two-dimensional (2D) semiconductor nanostructures have generated considerable interest over the past years. Among these nanostructures, colloidal semiconductor nanoplatelets have a thickness controlled with atomic precision (defined number of monolayers) which leads to strongly tunable and exceptionally narrow optical features [1]. The recent development of II-VI semiconductor heterostructures of various shapes and compositions has allowed to access new optical properties [1]. Here we use femtosecond transient absorption spectroscopy to study the ultrafast dynamics of excitons and charge carriers in CdSe-CdTe core-crown nanoplatelets [2].

We will also present the current progress in the development of a new two-dimensional electronic spectroscopy setup operating in the visible and ultra-violet range to investigate the sub-100 fs dynamics of colloidal nanocrystals after optical excitation well above the bandgap of the semiconductor nanostructures[3].


References :

[1] N. Nasilowski, B. Mahler, E. Lhuillier, S. Ithurria, B. Dubertret, Chem. Rev. 2016, 116, 10934.
[2] S. Pedetti, S. Ithurria, H. Heuclin, G. Patriarche, B. Dubertret, J. Am. Chem Soc. 2014, 136, 16430.
[3] E. Cassette, J.C. Dean, G.D. Scholes, Small 2016, 12, 2234.


Collaboration: Elsa Cassette1, Benoît Mahler2, Silvia Pedetti3, Gregory Scholes4

1) LIDYL, UMR 9222 CEA-CNRS-Université Paris-Saclay

2) LM, UMR 5306 Université Claude Bernard, Lyon 1 - CNRS


4) Department of Chemistry, Princeton University, USA


Contact : elodie dubois


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