Journal of Physical Chemistry C, volume 119, issue 15, pages 8410-8416
Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals
Publication type: Journal Article
Publication date: 2015-04-07
Journal:
Journal of Physical Chemistry C
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 19327447, 19327455
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
General Energy
Abstract
Detailed analysis on charge separation energetics and dynamics for CdTe/ZnS nanocrystals have been carried out with varying shell thickness to elucidate quasi-type-II behavior in a standard type-I system. Redshift in the absorption–photoluminescence spectra and increase of the excited state lifetime in the core/shell nanocrystals with a thick ZnS shell (2 and 4 ML of ZnS) indicate quasi-type-II behavior caused by charge separation. Separation of charge arises as the lattice strain at the core/shell interface alters the conduction band energy levels for both the core and the shell in an opposite way, extending the electronic wave function toward the shell. To find out the energetics of the charge separation, the steady-state spectra were analyzed in the realm of Marcus theory to reveal charge separation occurring in the inverted region with −ΔG°ET > λ. Slow electron cooling as observed from ultrafast transient absorption measurements with increasing shell thickness also confirms electron being decoupled from the hole as the electronic wave function spreads out to the shell. Consistent with the Marcus theory analysis, the separation of charge is clearly exhibited in the nanocrystal with the highest ZnS shell thickness because the excitonic bleach shows a slower electron cooling rate and increased amplitude of a slow recovery component in the red region of transient absorption spectrum.
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Citations by publishers
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1 publication, 2.86%
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- We do not take into account publications without a DOI.
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Maiti S. et al. Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals // Journal of Physical Chemistry C. 2015. Vol. 119. No. 15. pp. 8410-8416.
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Maiti S., Debnath T., Maity P. P., Ghosh H. N. Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals // Journal of Physical Chemistry C. 2015. Vol. 119. No. 15. pp. 8410-8416.
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TY - JOUR
DO - 10.1021/acs.jpcc.5b02420
UR - https://doi.org/10.1021/acs.jpcc.5b02420
TI - Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals
T2 - Journal of Physical Chemistry C
AU - Maiti, Sourav
AU - Debnath, T.
AU - Maity, Partha Pratim
AU - Ghosh, Hirendra Nath
PY - 2015
DA - 2015/04/07 00:00:00
PB - American Chemical Society (ACS)
SP - 8410-8416
IS - 15
VL - 119
SN - 1932-7447
SN - 1932-7455
ER -
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@article{2015_Maiti,
author = {Sourav Maiti and T. Debnath and Partha Pratim Maity and Hirendra Nath Ghosh},
title = {Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals},
journal = {Journal of Physical Chemistry C},
year = {2015},
volume = {119},
publisher = {American Chemical Society (ACS)},
month = {apr},
url = {https://doi.org/10.1021/acs.jpcc.5b02420},
number = {15},
pages = {8410--8416},
doi = {10.1021/acs.jpcc.5b02420}
}
Cite this
MLA
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Maiti, Sourav, et al. “Lattice-Strain-Induced Slow Electron Cooling Due to Quasi-Type-II Behavior in Type-I CdTe/ZnS Nanocrystals.” Journal of Physical Chemistry C, vol. 119, no. 15, Apr. 2015, pp. 8410-8416. https://doi.org/10.1021/acs.jpcc.5b02420.