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Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System

Zidek, Karel LU ; Zheng, Kaibo LU ; Qenawy, Mohamed LU ; Chabera, Pavel LU ; Pullerits, Tönu LU and Tachyia, Masanori (2014) In Journal of Physical Chemistry C 118(47). p.27567-27573
Abstract
We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
118
issue
47
pages
27567 - 27573
publisher
The American Chemical Society
external identifiers
  • wos:000345722400046
  • scopus:84949115702
ISSN
1932-7447
DOI
10.1021/jp509242r
language
English
LU publication?
yes
id
d484f43e-9712-4654-8861-55ead7ea0ad6 (old id 4962719)
date added to LUP
2015-01-29 12:43:17
date last changed
2017-03-26 03:14:25
@article{d484f43e-9712-4654-8861-55ead7ea0ad6,
  abstract     = {We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.},
  author       = {Zidek, Karel and Zheng, Kaibo and Qenawy, Mohamed and Chabera, Pavel and Pullerits, Tönu and Tachyia, Masanori},
  issn         = {1932-7447},
  language     = {eng},
  number       = {47},
  pages        = {27567--27573},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System},
  url          = {http://dx.doi.org/10.1021/jp509242r},
  volume       = {118},
  year         = {2014},
}