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Auger Recombination Suppression in Nanocrystals with Asymmetric Electron–Hole Confinement
Author(s) -
Climente Juan I.,
Movilla Jose L.,
Planelles Josep
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201101740
Subject(s) - auger effect , nanocrystal , electron , auger , monolayer , materials science , hamiltonian (control theory) , shell (structure) , condensed matter physics , quantum dot , coupling (piping) , molecular physics , atomic physics , auger electron spectroscopy , recombination , nanotechnology , physics , chemistry , nuclear physics , mathematical optimization , mathematics , metallurgy , composite material , biochemistry , gene
Type II and quasi‐type II nanocrystals with thick shells exhibit reduced blinking. However, after a number of monolayers, the influence of the shell thickness is found to vanish. Using a two‐band Kane Hamiltonian, it is shown that this behavior is a consequence of interband coupling and asymmetric confinement of electrons and holes. Interface alloying provides an additional, order‐of‐magnitude contribution to the Auger suppression, in agreement with recent experiments. The existence is predicted of critical shell thicknesses that strongly quench Auger processes for any core size.