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Multiple exciton generation in nano-crystals revisited: Consistent calculation of the yield based on pump-probe spectroscopy.

Karki, Khadga Jung LU ; Ma, Fei LU ; Zheng, Kaibo LU ; Zidek, Karel LU ; Mousa, Abdelrazek ; Qenawy, Mohamed LU ; Messing, Maria LU ; Wallenberg, Reine LU ; Yartsev, Arkady LU orcid and Pullerits, Tönu LU (2013) In Scientific Reports 3.
Abstract
Multiple exciton generation (MEG) is a process in which more than one exciton is generated upon the absorption of a high energy photon, typically higher than two times the band gap, in semiconductor nanocrystals. It can be observed experimentally using time resolved spectroscopy such as the transient absorption measurements. Quantification of the MEG yield is usually done by assuming that the bi-exciton signal is twice the signal from a single exciton. Herein we show that this assumption is not always justified and may lead to significant errors in the estimated MEG yields. We develop a methodology to determine proper scaling factors to the signals from the transient absorption experiments. Using the methodology we find modest MEG yields... (More)
Multiple exciton generation (MEG) is a process in which more than one exciton is generated upon the absorption of a high energy photon, typically higher than two times the band gap, in semiconductor nanocrystals. It can be observed experimentally using time resolved spectroscopy such as the transient absorption measurements. Quantification of the MEG yield is usually done by assuming that the bi-exciton signal is twice the signal from a single exciton. Herein we show that this assumption is not always justified and may lead to significant errors in the estimated MEG yields. We develop a methodology to determine proper scaling factors to the signals from the transient absorption experiments. Using the methodology we find modest MEG yields in lead chalcogenide nanocrystals including the nanorods. (Less)
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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
3
article number
2287
publisher
Nature Publishing Group
external identifiers
  • wos:000322308700001
  • pmid:23887181
  • scopus:84881356632
  • pmid:23887181
ISSN
2045-2322
DOI
10.1038/srep02287
language
English
LU publication?
yes
id
1fc7fe5e-54d3-4b1b-bfe5-fdc978672017 (old id 3955575)
date added to LUP
2016-04-01 14:42:20
date last changed
2023-11-13 11:09:45
@article{1fc7fe5e-54d3-4b1b-bfe5-fdc978672017,
  abstract     = {{Multiple exciton generation (MEG) is a process in which more than one exciton is generated upon the absorption of a high energy photon, typically higher than two times the band gap, in semiconductor nanocrystals. It can be observed experimentally using time resolved spectroscopy such as the transient absorption measurements. Quantification of the MEG yield is usually done by assuming that the bi-exciton signal is twice the signal from a single exciton. Herein we show that this assumption is not always justified and may lead to significant errors in the estimated MEG yields. We develop a methodology to determine proper scaling factors to the signals from the transient absorption experiments. Using the methodology we find modest MEG yields in lead chalcogenide nanocrystals including the nanorods.}},
  author       = {{Karki, Khadga Jung and Ma, Fei and Zheng, Kaibo and Zidek, Karel and Mousa, Abdelrazek and Qenawy, Mohamed and Messing, Maria and Wallenberg, Reine and Yartsev, Arkady and Pullerits, Tönu}},
  issn         = {{2045-2322}},
  language     = {{eng}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Scientific Reports}},
  title        = {{Multiple exciton generation in nano-crystals revisited: Consistent calculation of the yield based on pump-probe spectroscopy.}},
  url          = {{http://dx.doi.org/10.1038/srep02287}},
  doi          = {{10.1038/srep02287}},
  volume       = {{3}},
  year         = {{2013}},
}