Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation
Abstract
We use a Boltzmann transport equation (BE) to study time evolution of a photo-excited state in a nanoparticle including phonon-mediated exciton relaxation and the multiple exciton generation (MEG) processes, such as exciton-to-biexciton multiplication and biexciton-to-exciton recombination. BE collision integrals are computed using Kadanoff-Baym-Keldysh many-body perturbation theory based on density functional theory simulations, including exciton effects. We compute internal quantum efficiency (QE), which is the number of excitons generated from an absorbed photon in the course of the relaxation. We apply this approach to chiral single-wall carbon nanotubes (SWCNTs), such as (6,2) and (6,5). We predict efficient MEG in the (6,2) and (6,5) SWCNTs within the solar spectrum range starting at the 2Eg energy threshold and with QE reaching ~1.6 at about 3Eg, where Eg is the electronic gap.
- Authors:
-
- North Dakota State Univ., Fargo, ND (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1497879
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 147; Journal Issue: 15; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Kryjevski, Andrei, Mihaylov, Deyan, Kilina, Svetlana, and Kilin, Dmitri. Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation. United States: N. p., 2017.
Web. doi:10.1063/1.4997048.
Kryjevski, Andrei, Mihaylov, Deyan, Kilina, Svetlana, & Kilin, Dmitri. Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation. United States. https://doi.org/10.1063/1.4997048
Kryjevski, Andrei, Mihaylov, Deyan, Kilina, Svetlana, and Kilin, Dmitri. Fri .
"Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation". United States. https://doi.org/10.1063/1.4997048. https://www.osti.gov/servlets/purl/1497879.
@article{osti_1497879,
title = {Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation},
author = {Kryjevski, Andrei and Mihaylov, Deyan and Kilina, Svetlana and Kilin, Dmitri},
abstractNote = {We use a Boltzmann transport equation (BE) to study time evolution of a photo-excited state in a nanoparticle including phonon-mediated exciton relaxation and the multiple exciton generation (MEG) processes, such as exciton-to-biexciton multiplication and biexciton-to-exciton recombination. BE collision integrals are computed using Kadanoff-Baym-Keldysh many-body perturbation theory based on density functional theory simulations, including exciton effects. We compute internal quantum efficiency (QE), which is the number of excitons generated from an absorbed photon in the course of the relaxation. We apply this approach to chiral single-wall carbon nanotubes (SWCNTs), such as (6,2) and (6,5). We predict efficient MEG in the (6,2) and (6,5) SWCNTs within the solar spectrum range starting at the 2Eg energy threshold and with QE reaching ~1.6 at about 3Eg, where Eg is the electronic gap.},
doi = {10.1063/1.4997048},
journal = {Journal of Chemical Physics},
number = 15,
volume = 147,
place = {United States},
year = {2017},
month = {10}
}
Web of Science
Figures / Tables:

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