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Multiexciton Absorption Cross Sections of CdSe Quantum Dots Determined by Ultrafast Spectroscopy

Lenngren, Nils LU ; Garting, Tommy LU ; Zheng, Kaibo LU ; Qenawy, Mohamed LU ; Lascoux, Noelle LU ; Ma, Fei LU ; Yartsev, Arkady LU orcid ; Zidek, Karel LU and Pullerits, Tönu LU (2013) In The Journal of Physical Chemistry Letters 4(19). p.3330-3336
Abstract
Multiexciton absorption cross sections are important for analysis of a number of experiments, including multiple exciton generation and stimulated emisson. We present a rigorous method to determine these cross sections using transient absorption (TA) measurements. We apply the method to CdSe quantum dots (QDs) and core–shell (CdSe)ZnS QDs. The method involves measuring TA dynamics for various excitation intensities over a broad time range and analyzing the experiments in terms of a kinetic multiexciton model taking into account all contributions to the signal. In this way, we were able to quantify exciton and multiexciton absorption cross sections at different spectral positions. The absorption cross sections decrease with increasing... (More)
Multiexciton absorption cross sections are important for analysis of a number of experiments, including multiple exciton generation and stimulated emisson. We present a rigorous method to determine these cross sections using transient absorption (TA) measurements. We apply the method to CdSe quantum dots (QDs) and core–shell (CdSe)ZnS QDs. The method involves measuring TA dynamics for various excitation intensities over a broad time range and analyzing the experiments in terms of a kinetic multiexciton model taking into account all contributions to the signal. In this way, we were able to quantify exciton and multiexciton absorption cross sections at different spectral positions. The absorption cross sections decrease with increasing number of excitations, qualitatively in agreement with the state-filling effective mass model but showing a slower decrease. The cross sections for single-exciton to biexciton absorption range between 57 and 99% of the ground to single-exciton cross section. (Less)
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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
quantum dots, CdSe, multiexciton, absorption cross sections, femtosecond spectroscopy, transient absorption
in
The Journal of Physical Chemistry Letters
volume
4
issue
19
pages
3330 - 3336
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000326300800024
  • scopus:84885104742
  • pmid:26705821
ISSN
1948-7185
DOI
10.1021/jz401522h
language
English
LU publication?
yes
additional info
Authors Nils Lenngren and Tommy Garting contributed equally to the article. The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060), Department of Chemistry (011001220)
id
a63a266a-c4eb-4d0c-8f72-f940e1335d9f (old id 4157113)
alternative location
http://pubs.acs.org/doi/abs/10.1021/jz401522h
date added to LUP
2016-04-01 13:23:15
date last changed
2023-09-02 23:07:19
@article{a63a266a-c4eb-4d0c-8f72-f940e1335d9f,
  abstract     = {{Multiexciton absorption cross sections are important for analysis of a number of experiments, including multiple exciton generation and stimulated emisson. We present a rigorous method to determine these cross sections using transient absorption (TA) measurements. We apply the method to CdSe quantum dots (QDs) and core–shell (CdSe)ZnS QDs. The method involves measuring TA dynamics for various excitation intensities over a broad time range and analyzing the experiments in terms of a kinetic multiexciton model taking into account all contributions to the signal. In this way, we were able to quantify exciton and multiexciton absorption cross sections at different spectral positions. The absorption cross sections decrease with increasing number of excitations, qualitatively in agreement with the state-filling effective mass model but showing a slower decrease. The cross sections for single-exciton to biexciton absorption range between 57 and 99% of the ground to single-exciton cross section.}},
  author       = {{Lenngren, Nils and Garting, Tommy and Zheng, Kaibo and Qenawy, Mohamed and Lascoux, Noelle and Ma, Fei and Yartsev, Arkady and Zidek, Karel and Pullerits, Tönu}},
  issn         = {{1948-7185}},
  keywords     = {{quantum dots; CdSe; multiexciton; absorption cross sections; femtosecond spectroscopy; transient absorption}},
  language     = {{eng}},
  number       = {{19}},
  pages        = {{3330--3336}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The Journal of Physical Chemistry Letters}},
  title        = {{Multiexciton Absorption Cross Sections of CdSe Quantum Dots Determined by Ultrafast Spectroscopy}},
  url          = {{http://dx.doi.org/10.1021/jz401522h}},
  doi          = {{10.1021/jz401522h}},
  volume       = {{4}},
  year         = {{2013}},
}