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Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires

Zheng, Kaibo LU ; Zidek, Karel LU ; Qenawy, Mohamed LU ; Torbjörnsson, Magne LU ; Chabera, Pavel LU ; Shao, Shuyan; Zhang, Fengling and Pullerits, Tönu LU (2013) In The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory 117(29). p.5919-5925
Abstract
A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron... (More)
A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
volume
117
issue
29
pages
5919 - 5925
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000322503200009
  • scopus:84879226704
ISSN
1520-5215
DOI
10.1021/jp3098632
language
English
LU publication?
yes
id
53b6cd47-7dda-4e4e-a520-da046f8ecc96 (old id 4063587)
date added to LUP
2013-10-18 11:20:29
date last changed
2019-10-23 02:58:58
@article{53b6cd47-7dda-4e4e-a520-da046f8ecc96,
  abstract     = {A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns.},
  author       = {Zheng, Kaibo and Zidek, Karel and Qenawy, Mohamed and Torbjörnsson, Magne and Chabera, Pavel and Shao, Shuyan and Zhang, Fengling and Pullerits, Tönu},
  issn         = {1520-5215},
  language     = {eng},
  number       = {29},
  pages        = {5919--5925},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory},
  title        = {Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires},
  url          = {http://dx.doi.org/10.1021/jp3098632},
  volume       = {117},
  year         = {2013},
}