Issue 36, 2015

Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: indirect evidence for a permanent dipole moment

Abstract

Single nanoparticle studies of charge trapping and de-trapping in core/shell CdSe/ZnS nanocrystals incorporated into an insulating matrix and subjected to an external electric field demonstrate the ability to reversibly modulate the exciton dynamics and photoluminescence blinking while providing indirect evidence for the existence of a permanent ground state dipole moment in such nanocrystals. A model assuming the presence of energetically deep charge traps physically aligned along the direction of the permanent dipole is proposed in order to explain the dynamics of nanocrystal blinking in the presence of a permanent dipole moment.

Graphical abstract: Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: indirect evidence for a permanent dipole moment

Supplementary files

Article information

Article type
Paper
Submitted
05 Jun 2015
Accepted
05 Aug 2015
First published
05 Aug 2015

Nanoscale, 2015,7, 14897-14905

Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: indirect evidence for a permanent dipole moment

H. Zang, M. Cristea, X. Shen, M. Liu, F. Camino and M. Cotlet, Nanoscale, 2015, 7, 14897 DOI: 10.1039/C5NR03714J

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