title: 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.
authors: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA. cotlet@bnl.gov.
authors: Huidong
authors: H
authors: Zang
authors: Mihail
authors: M
authors: Cristea
authors: Xuan
authors: X
authors: Shen
authors: Mingzhao
authors: M
authors: Liu
authors: Fernando
authors: F
authors: Camino
authors: Mircea
authors: M
authors: Cotlet