Multiexciton Absorption Cross Sections of CdSe Quantum Dots Determined by Ultrafast Spectroscopy
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4157113
- author
- Lenngren, Nils LU ; Garting, Tommy LU ; Zheng, Kaibo LU ; Qenawy, Mohamed LU ; Lascoux, Noelle LU ; Ma, Fei LU ; Yartsev, Arkady LU ; Zidek, Karel LU and Pullerits, Tönu LU
- organization
- publishing date
- 2013
- 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}}, }