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Balancing Electron Transfer and Surface Passivation in Gradient CdSe/ZnS Core-Shell Quantum Dots Attached to ZnO

Qenawy, Mohamed LU ; Zidek, Karel LU ; Zheng, Kaibo LU ; Chabera, Pavel LU ; Messing, Maria LU and Pullerits, Tönu LU (2013) In The Journal of Physical Chemistry Letters 4(11). p.1760-1765
Abstract
Core-shell (CS) quantum dots (QDs) are promising light absorbers for solar cell applications mainly because of their enhanced photostability compared with bare QDs. Moreover, the superb photostability can be combined with a low number of defects by using CSQDs with a gradient composition change from the core to the shell. Here, we study electron injection from the gradient CSQDs to ZnO nanoparticles. We observe the typical exponential injection rate dependence on the shell thickness (beta = 0.51 angstrom(-1)) and discuss it in light of previously published results on step-like CSQDs. Despite the rapid drop in injection rates with shell thickness, we find that there exists an optimum thickness of the shell layer at similar to 1 nm, which... (More)
Core-shell (CS) quantum dots (QDs) are promising light absorbers for solar cell applications mainly because of their enhanced photostability compared with bare QDs. Moreover, the superb photostability can be combined with a low number of defects by using CSQDs with a gradient composition change from the core to the shell. Here, we study electron injection from the gradient CSQDs to ZnO nanoparticles. We observe the typical exponential injection rate dependence on the shell thickness (beta = 0.51 angstrom(-1)) and discuss it in light of previously published results on step-like CSQDs. Despite the rapid drop in injection rates with shell thickness, we find that there exists an optimum thickness of the shell layer at similar to 1 nm, which combines high injection efficiency (>90%) with a superior passivation of QDs. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
4
issue
11
pages
1760 - 1765
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000320214600001
  • pmid:26283106
  • scopus:84879241318
  • pmid:26283106
ISSN
1948-7185
DOI
10.1021/jz4006459
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Solid State Physics (011013006), Chemical Physics (S) (011001060)
id
72fe47f6-8a0a-4400-a4d2-de886a32714c (old id 3983074)
date added to LUP
2016-04-01 13:03:59
date last changed
2023-11-12 11:34:21
@article{72fe47f6-8a0a-4400-a4d2-de886a32714c,
  abstract     = {{Core-shell (CS) quantum dots (QDs) are promising light absorbers for solar cell applications mainly because of their enhanced photostability compared with bare QDs. Moreover, the superb photostability can be combined with a low number of defects by using CSQDs with a gradient composition change from the core to the shell. Here, we study electron injection from the gradient CSQDs to ZnO nanoparticles. We observe the typical exponential injection rate dependence on the shell thickness (beta = 0.51 angstrom(-1)) and discuss it in light of previously published results on step-like CSQDs. Despite the rapid drop in injection rates with shell thickness, we find that there exists an optimum thickness of the shell layer at similar to 1 nm, which combines high injection efficiency (>90%) with a superior passivation of QDs.}},
  author       = {{Qenawy, Mohamed and Zidek, Karel and Zheng, Kaibo and Chabera, Pavel and Messing, Maria and Pullerits, Tönu}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{11}},
  pages        = {{1760--1765}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The Journal of Physical Chemistry Letters}},
  title        = {{Balancing Electron Transfer and Surface Passivation in Gradient CdSe/ZnS Core-Shell Quantum Dots Attached to ZnO}},
  url          = {{http://dx.doi.org/10.1021/jz4006459}},
  doi          = {{10.1021/jz4006459}},
  volume       = {{4}},
  year         = {{2013}},
}