Titre :

Ultrafast exciton dynamics in InAs/ZnSe nanocrystal quantum dots

Auteur(s) :

Cadirci, Musa [Auteur]
University of Manchester [Manchester]
Stubbs, Stuart K. [Auteur]
University of Manchester [Manchester]
Hardman, Samantha J. O. [Auteur]
University of Manchester [Manchester]
Masala, Ombretta [Auteur]
Allan, Guy [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Pickett, Nigel [Auteur]
Binks, David J. [Auteur]
University of Manchester [Manchester]

Titre de la revue :

Physical Chemistry Chemical Physics

Pagination :

15166-15172

Éditeur :

Royal Society of Chemistry

Date de publication :

2012-08-30

ISSN :

1463-9076

Discipline(s) HAL :

Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

Colloidal nanocrystal quantum dots with a band gap in the near infra-red have potential application as the emitters for telecommunications or in vivo imaging, or as the photo-absorbing species in next generation solar cells ...
Lire la suite >Colloidal nanocrystal quantum dots with a band gap in the near infra-red have potential application as the emitters for telecommunications or in vivo imaging, or as the photo-absorbing species in next generation solar cells or photodetectors. However, electro- and photoluminescence yields and the efficiency with which photo-generated charges can be extracted from quantum dots depend on the total rate of recombination, which can be dominated by surface-mediated processes. In this study, we use ultrafast transient absorption spectroscopy to characterise the recombination dynamics of photo-generated charges in InAs/ZnSe nanocrystal quantum dots. We find that recombination is dominated by rapid, sub-nanosecond transfer of conduction band electrons to surface states. For the size of dots studied, we also find no evidence of significant multiple exciton generation for photon energies up to 3.2 times the band gap, in agreement with our theoretical modellingLire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL