Nano Letters, volume 5, issue 12, pages 2360-2364

Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps.

Publication typeJournal Article
Publication date2005-11-01
Journal: Nano Letters
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor10.8
ISSN15306984, 15306992
General Chemistry
Condensed Matter Physics
General Materials Science
Mechanical Engineering
Bioengineering
Abstract
Using atomistic, semiempirical pseudopotential calculations, we show that if one assumes the simplest form of a surface state in a CdSe nanocrystal--an unpassivated surface anion site--one can explain theoretically several puzzling aspects regarding the observed temperature dependence of the radiative decay of excitons. In particular, our calculations show that the presence of surface states leads to a mixing of the dark and bright exciton states, resulting in a decrease of 3 orders of magnitude of the dark-exciton radiative lifetime. This result explains the persistence of the zero-phonon emission line at low temperature, for which thermal population of higher-energy bright-exciton states is negligible. Thus, we suggest that surface states are the controlling factor of dark-exciton radiative recombination in currently synthesized colloidal CdSe nanocrystals.

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GOST |
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Califano M., Franceschetti A., Zunger A. Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps. // Nano Letters. 2005. Vol. 5. No. 12. pp. 2360-2364.
GOST all authors (up to 50) Copy
Califano M., Franceschetti A., Zunger A. Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps. // Nano Letters. 2005. Vol. 5. No. 12. pp. 2360-2364.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/nl051027p
UR - https://doi.org/10.1021/nl051027p
TI - Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps.
T2 - Nano Letters
AU - Franceschetti, Alberto
AU - Califano, Marco
AU - Zunger, Alex
PY - 2005
DA - 2005/11/01 00:00:00
PB - American Chemical Society (ACS)
SP - 2360-2364
IS - 12
VL - 5
SN - 1530-6984
SN - 1530-6992
ER -
BibTex |
Cite this
BibTex Copy
@article{2005_Califano,
author = {Alberto Franceschetti and Marco Califano and Alex Zunger},
title = {Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps.},
journal = {Nano Letters},
year = {2005},
volume = {5},
publisher = {American Chemical Society (ACS)},
month = {nov},
url = {https://doi.org/10.1021/nl051027p},
number = {12},
pages = {2360--2364},
doi = {10.1021/nl051027p}
}
MLA
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MLA Copy
Califano, Marco, et al. “Temperature dependence of excitonic radiative decay in CdSe quantum dots: the role of surface hole traps..” Nano Letters, vol. 5, no. 12, Nov. 2005, pp. 2360-2364. https://doi.org/10.1021/nl051027p.
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