Time dependent study of multiple exciton generation in nanocrystal quantum dots
Damtie, Fikeraddis A. LU and Wacker, Andreas LU
(2016)
In Journal of Physics: Conference Series
696(1).
- Abstract
We study the exciton dynamics in an optically excited nanocrystal quantum dot. Multiple exciton formation is more efficient in nanocrystal quantum dots compared to bulk semiconductors due to enhanced Coulomb interactions and the absence of conservation of momentum. The formation of multiple excitons is dependent on different excitation parameters and the dissipation. We study this process within a Lindblad quantum rate equation using the full many-particle states. We optically excite the system by creating a single high energy exciton ESX in resonance to a double exciton EDX. With Coulomb electron-electron interaction, the population can be transferred from the single exciton to the double exciton state by impact... (More)
We study the exciton dynamics in an optically excited nanocrystal quantum dot. Multiple exciton formation is more efficient in nanocrystal quantum dots compared to bulk semiconductors due to enhanced Coulomb interactions and the absence of conservation of momentum. The formation of multiple excitons is dependent on different excitation parameters and the dissipation. We study this process within a Lindblad quantum rate equation using the full many-particle states. We optically excite the system by creating a single high energy exciton ESX in resonance to a double exciton EDX. With Coulomb electron-electron interaction, the population can be transferred from the single exciton to the double exciton state by impact ionisation (inverse Auger process). The ratio between the recombination processes and the absorbed photons provide the yield of the structure. We observe a quantum yield of comparable value to experiment assuming typical experimental conditions for a 4 nm PbS quantum dot.
(Less)
- author
- Damtie, Fikeraddis A.
LU
and Wacker, Andreas
LU
- organization
- publishing date
- 2016-04-12
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physics: Conference Series
- volume
- 696
- issue
- 1
- article number
- 012012
- publisher
- IOP Publishing
- external identifiers
-
- wos:000389721800019
- scopus:84964843205
- ISSN
- 1742-6596
- DOI
- 10.1088/1742-6596/696/1/012012
- language
- English
- LU publication?
- yes
- id
- 1e7ef85f-212e-4bf8-a8d4-66e59a9c2278
- date added to LUP
- 2016-06-28 11:11:12
- date last changed
- 2024-10-04 22:14:01
@article{1e7ef85f-212e-4bf8-a8d4-66e59a9c2278,
abstract = {{<p>We study the exciton dynamics in an optically excited nanocrystal quantum dot. Multiple exciton formation is more efficient in nanocrystal quantum dots compared to bulk semiconductors due to enhanced Coulomb interactions and the absence of conservation of momentum. The formation of multiple excitons is dependent on different excitation parameters and the dissipation. We study this process within a Lindblad quantum rate equation using the full many-particle states. We optically excite the system by creating a single high energy exciton E<sub>SX</sub> in resonance to a double exciton E<sub>DX</sub>. With Coulomb electron-electron interaction, the population can be transferred from the single exciton to the double exciton state by impact ionisation (inverse Auger process). The ratio between the recombination processes and the absorbed photons provide the yield of the structure. We observe a quantum yield of comparable value to experiment assuming typical experimental conditions for a 4 nm PbS quantum dot.</p>}},
author = {{Damtie, Fikeraddis A. and Wacker, Andreas}},
issn = {{1742-6596}},
language = {{eng}},
month = {{04}},
number = {{1}},
publisher = {{IOP Publishing}},
series = {{Journal of Physics: Conference Series}},
title = {{Time dependent study of multiple exciton generation in nanocrystal quantum dots}},
url = {{http://dx.doi.org/10.1088/1742-6596/696/1/012012}},
doi = {{10.1088/1742-6596/696/1/012012}},
volume = {{696}},
year = {{2016}},
}