Role of impact ionization in multiple ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Role of impact ionization in multiple exciton generation in PbSe nanocrystals
Auteur(s) :
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]
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]
Titre de la revue :
Physical Review B: Condensed Matter and Materials Physics (1998-2015)
Pagination :
205423-1-5
Éditeur :
American Physical Society
Date de publication :
2006
ISSN :
1098-0121
Discipline(s) HAL :
Sciences de l'ingénieur [physics]
Résumé en anglais : [en]
In the impact ionization process, a hot carrier relaxes by generating an exciton. We present tight binding calculations showing that the rate of this process in PbSe nanocrystals has a strong energy dependence and that the ...
Lire la suite >In the impact ionization process, a hot carrier relaxes by generating an exciton. We present tight binding calculations showing that the rate of this process in PbSe nanocrystals has a strong energy dependence and that the relaxation energy increases linearly with the carrier excess energy. The impact ionization can be extremely fast (∼fs) but it is not enhanced by the confinement in contrast to the usual belief. It explains the multiple exciton generation observed experimentally in these dots except at high photon energy where more complex many-particle phenomena are involved.Lire moins >
Lire la suite >In the impact ionization process, a hot carrier relaxes by generating an exciton. We present tight binding calculations showing that the rate of this process in PbSe nanocrystals has a strong energy dependence and that the relaxation energy increases linearly with the carrier excess energy. The impact ionization can be extremely fast (∼fs) but it is not enhanced by the confinement in contrast to the usual belief. It explains the multiple exciton generation observed experimentally in these dots except at high photon energy where more complex many-particle phenomena are involved.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :