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

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.
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  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. "Politehnica" of Bucharest, Bucharest (Romania)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2040-3364; NANOHL; KC0403020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 92; Journal Issue: 1; Journal ID: ISSN 2040-3364
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE colloidal quantum dots; charge transfer; dipole moment; blinking; quantum-confined Stark effect