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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

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:
 [1];  [2];  [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. "Politehnica" of Bucharest, Bucharest (Romania)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1213388
Report Number(s):
BNL-108272-2015-JA
Journal ID: ISSN 2040-3364; NANOHL; KC0403020
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 92; Journal Issue: 1; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; colloidal quantum dots; charge transfer; dipole moment; blinking; quantum-confined Stark effect

Citation Formats

Zang, Huidong, Cristea, Mihail, Shen, Xuan, Liu, Mingzhao, Camino, Fernando, and Cotlet, Mircea. Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: Indirect evidence for a permanent dipole moment. United States: N. p., 2015. Web. doi:10.1039/C5NR03714J.
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Zang, Huidong, Cristea, Mihail, Shen, Xuan, Liu, Mingzhao, Camino, Fernando, & Cotlet, Mircea. Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: Indirect evidence for a permanent dipole moment. United States. https://doi.org/10.1039/C5NR03714J
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Zang, Huidong, Cristea, Mihail, Shen, Xuan, Liu, Mingzhao, Camino, Fernando, and Cotlet, Mircea. Wed . "Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: Indirect evidence for a permanent dipole moment". United States. https://doi.org/10.1039/C5NR03714J. https://www.osti.gov/servlets/purl/1213388.
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@article{osti_1213388,
title = {Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: Indirect evidence for a permanent dipole moment},
author = {Zang, Huidong and Cristea, Mihail and Shen, Xuan and Liu, Mingzhao and Camino, Fernando and Cotlet, Mircea},
abstractNote = {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.},
doi = {10.1039/C5NR03714J},
journal = {Nanoscale},
number = 1,
volume = 92,
place = {United States},
year = {Wed Aug 05 00:00:00 EDT 2015},
month = {Wed Aug 05 00:00:00 EDT 2015}
}
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https://doi.org/10.1039/C5NR03714J
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    Works referencing / citing this record:

    Peculiarities of the nonlinear absorption of colloidal solutions of CdSe/ZnS quantum dots under stationary single-photon excitation of excitons
    journal, November 2017

    • Smirnov, A. M.; Golinskaya, A. D.; Ezhova, K. V.
    • Journal of Experimental and Theoretical Physics, Vol. 125, Issue 5
    • DOI: 10.1134/s1063776117110127
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