Journal of Chemical Physics, volume 92, issue 11, pages 6927-6939

Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs

Ying Wang 1
Andris Suna 1
John McHugh 1
Edwin F Hilinski 2
Patricia A Lucas 2
Robert D. Johnson 2
1
 
Central Research and Development Department, E. I. DuPont de Nemours & Co., P. O. Box 80356, Wilmington, Delaware 19880-0356
Publication typeJournal Article
Publication date1990-06-01
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor4.4
ISSN00219606, 10897690
Physical and Theoretical Chemistry
General Physics and Astronomy
Abstract

We studied the optical transient bleaching of ∼40 Å, ammonia-passivated CdS clusters in a polymer with nanosecond and picosecond pump-probe techniques. The transient bleaching spectra behave differently in different time regimes. Within the 30-ps pump laser pulse width, we tentatively attribute the bleaching to the exciton-exciton interaction, and the magnitude can be enhanced by surface passivation. On time scales of tens of picoseconds and longer following the pump pulse, when only trapped electron-hole pairs remain from the pump excitation, the bleaching is due to the interaction between such a trapped electron-hole pair and a bound exciton produced by the probe light. Experimentally we determined that roughly one trapped electron-hole pair can bleach the excitonic absorption of the whole CdS cluster. We developed a theoretical model which considers the effects of the trapped electron-hole pair on the energy of the exciton transition and its oscillator strength. We found that, when a trapped electron and hole are present, the lowest exciton absorption is red-shifted from the original exciton absorption, and this transition has a weak oscillator strength, which explains the observed efficient bleaching. The model also predicts that a trapped electron is more efficient than a trapped hole for bleaching the excitonic absorption of CdS clusters in the size regime considered here. This is confirmed by pulse radiolysis results. Finally, we discuss the possible effects of charged surface defects on the linear absorption spectra of semiconductor clusters.

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Wang Y. et al. Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs // Journal of Chemical Physics. 1990. Vol. 92. No. 11. pp. 6927-6939.
GOST all authors (up to 50) Copy
Wang Y., Suna A., McHugh J., Hilinski E. F., Lucas P. A., Johnson R. D. Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs // Journal of Chemical Physics. 1990. Vol. 92. No. 11. pp. 6927-6939.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1063/1.458280
UR - https://doi.org/10.1063/1.458280
TI - Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs
T2 - Journal of Chemical Physics
AU - Wang, Ying
AU - Suna, Andris
AU - McHugh, John
AU - Hilinski, Edwin F
AU - Lucas, Patricia A
AU - Johnson, Robert D.
PY - 1990
DA - 1990/06/01 00:00:00
PB - American Institute of Physics (AIP)
SP - 6927-6939
IS - 11
VL - 92
SN - 0021-9606
SN - 1089-7690
ER -
BibTex |
Cite this
BibTex Copy
@article{1990_Wang,
author = {Ying Wang and Andris Suna and John McHugh and Edwin F Hilinski and Patricia A Lucas and Robert D. Johnson},
title = {Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs},
journal = {Journal of Chemical Physics},
year = {1990},
volume = {92},
publisher = {American Institute of Physics (AIP)},
month = {jun},
url = {https://doi.org/10.1063/1.458280},
number = {11},
pages = {6927--6939},
doi = {10.1063/1.458280}
}
MLA
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MLA Copy
Wang, Ying, et al. “Optical transient bleaching of quantum‐confined CdS clusters: The effects of surface‐trapped electron–hole pairs.” Journal of Chemical Physics, vol. 92, no. 11, Jun. 1990, pp. 6927-6939. https://doi.org/10.1063/1.458280.
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