Journal of Physical Chemistry Letters, volume 5, issue 4, pages 659-665
Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation.
Jingya Sun
1
,
Wei-Li Yu
1
,
Anwar Usman
1
,
Tayirjan T. Isimjan
1
,
Silvano Dgobbo
1
,
Erkki Alarousu
1
,
Kazuhiro Takanabe
1
,
Publication type: Journal Article
Publication date: 2014-01-31
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 5.7
ISSN: 19487185, 19487185
Physical and Theoretical Chemistry
General Materials Science
Abstract
We explored biexciton generation via carrier multiplication (or multiple-exciton generation) by high-energy photons and by multiple-photon absorption in Ag2S quantum dots (QDs) using femtosecond broad-band transient absorption spectroscopy. Irrespective of the size of the QDs and how the multiple excitons are generated in the Ag2S QDs, two distinct characteristic time constants of 9.6-10.2 and 135-175 ps are obtained for the nonradiative Auger recombination of the multiple excitons, indicating the existence of two binding excitons, namely, tightly bound and weakly bound excitons. More importantly, the lifetimes of multiple excitons in Ag2S QDs were about 1 and 2 orders of magnitude longer than those of comparable size PbS QDs and single-walled carbon nanotubes, respectively. This result is significant because it suggests that by utilizing an appropriate electron acceptor, there is a higher possibility to extract multiple electron-hole pairs in Ag2S QDs, which should improve the performance of QD-based solar cell devices.
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Sun J. et al. Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation. // Journal of Physical Chemistry Letters. 2014. Vol. 5. No. 4. pp. 659-665.
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Sun J., Yu W., Usman A., Isimjan T. T., Dgobbo S., Alarousu E., Takanabe K., Mohammed O. Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation. // Journal of Physical Chemistry Letters. 2014. Vol. 5. No. 4. pp. 659-665.
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TY - JOUR
DO - 10.1021/jz5000512
UR - https://doi.org/10.1021/jz5000512
TI - Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation.
T2 - Journal of Physical Chemistry Letters
AU - Sun, Jingya
AU - Dgobbo, Silvano
AU - Alarousu, Erkki
AU - Yu, Wei-Li
AU - Usman, Anwar
AU - Isimjan, Tayirjan T.
AU - Takanabe, Kazuhiro
AU - Mohammed, Omar
PY - 2014
DA - 2014/01/31 00:00:00
PB - American Chemical Society (ACS)
SP - 659-665
IS - 4
VL - 5
SN - 1948-7185
SN - 1948-7185
ER -
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@article{2014_Sun,
author = {Jingya Sun and Silvano Dgobbo and Erkki Alarousu and Wei-Li Yu and Anwar Usman and Tayirjan T. Isimjan and Kazuhiro Takanabe and Omar Mohammed},
title = {Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation.},
journal = {Journal of Physical Chemistry Letters},
year = {2014},
volume = {5},
publisher = {American Chemical Society (ACS)},
month = {jan},
url = {https://doi.org/10.1021/jz5000512},
number = {4},
pages = {659--665},
doi = {10.1021/jz5000512}
}
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Sun, Jingya, et al. “Generation of Multiple Excitons in Ag2S Quantum Dots: Single High-Energy versus Multiple-Photon Excitation..” Journal of Physical Chemistry Letters, vol. 5, no. 4, Jan. 2014, pp. 659-665. https://doi.org/10.1021/jz5000512.