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Article Dans Une Revue Materials Advances Année : 2022

Perspective on the scintillating response of CdSe based nanoplatelets heterostructures

Zhu Meng
  • Fonction : Auteur
Benoit Mahler
Julien Houel
Andrey Vasil'Ev

Résumé

We explore the effect of shell thickness on the time and spectral response of CdSe/CdS core–crown and CdSe/CdZnS core–shell nanoplatelets (NPLs) under X-ray and intense optical excitation.We explore the effect of shell thickness on the time and spectral response of CdSe/CdS core–crown and CdSe/CdZnS core–shell nanoplatelets (NPLs) under X-ray and intense optical excitation. From their intensity-dependent spectral and timing response, we demonstrate that the exciton–exciton interaction in the bi-exciton (XX) changes from attractive to repulsive when varying the design from core/crown to thick quasi type II core/shell 2D nanostructures. We find that an additional shell layer of 0.4 nm is enough to convert the red-shifted XX emission to non- or blue-shifted emission. Under pulsed X-ray excitation, the scintillation decay dynamics reveal that multiexcitons are generated in all 2D nanostructures, whose presence can hardly be detected in the emission spectra for NPL thicknesses larger than 2 nm. We provide a numerical estimation of the number of scattering events of 35 keV electron as a function of NPL thickness, revealing that the formation of biexcitons with ultra-fast time response is more efficient in thick NPLs. However, this advantage is counterbalanced by a blue-shifted emission of that ultra-fast emission, rendering large NPLs less effective regarding the self-absorption issue.
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Dates et versions

hal-03865098 , version 1 (22-11-2023)

Identifiants

Citer

Zhu Meng, Benoit Mahler, Julien Houel, Florian Kulzer, Andrey Vasil'Ev, et al.. Perspective on the scintillating response of CdSe based nanoplatelets heterostructures. Materials Advances, 2022, 3 (22), pp.8341-8350. ⟨10.1039/d2ma00635a⟩. ⟨hal-03865098⟩
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