Multiple exciton generation in nano-crystals revisited: Consistent calculation of the yield based on pump-probe spectroscopy.
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3955575
- author
- 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 and Pullerits, Tönu LU
- organization
- publishing date
- 2013
- 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}}, }