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

Zang, Huidong; Cristea, Mihail; Shen, Xuan; Liu, Mingzhao; Camino, Fernando; Cotlet, Mircea

doi:10.1039/C5NR03714J

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

Journal Article · Wed Aug 05 00:00:00 EDT 2015 · Nanoscale

DOI:https://doi.org/10.1039/C5NR03714J· OSTI ID:1213388

Zang, Huidong ^[1]; Cristea, Mihail ^[2]; Shen, Xuan ^[1]; Liu, Mingzhao ^[1]; Camino, Fernando ^[1]; Cotlet, Mircea ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. "Politehnica" of Bucharest, Bucharest (Romania)

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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI ID:: 1213388

Report Number(s):: BNL--108272-2015-JA; KC0403020

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 1 Vol. 92; ISSN NANOHL; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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

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