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Article Dans Une Revue Nanoscale Année : 2018

Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets

Anatolie Mitioglu
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Michel Nasilowski
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Manfred Bayer

Résumé

We study the band-edge exciton fine structure and in particular its bright-dark splitting in colloidal semiconductor nanocrystals by four different optical methods based on fluorescence line narrowing and time-resolved measurements at various temperatures down to 2 K. We demonstrate that all these methods provide consistent splitting values and discuss their advances and limitations. Colloidal CdSe nanoplatelets with thicknesses of 3, 4 and 5 monolayers are chosen for experimental demonstrations. The bright-dark splitting of excitons varies from 3.2 to 6.0 meV and is inversely proportional to the nanoplatelet thickness. Good agreement between experimental and theoretically calculated size dependence of the bright-dark exciton slitting is achieved. The recom-bination rates of the bright and dark excitons and the bright to dark relaxation rate are measured by time-resolved techniques.
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Dates et versions

hal-02394900 , version 1 (05-12-2019)

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Elena V Shornikova, Louis Biadala, Dmitri R Yakovlev, Victor F Sapega, Yuri G Kusrayev, et al.. Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets. Nanoscale, 2018, 10 (2), pp.646-656. ⟨10.1039/C7NR07206F⟩. ⟨hal-02394900⟩
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