Many-particle excitations in non-covalently doped single-walled carbon nanotubes.
Sci Rep
; 9(1): 14985, 2019 Oct 18.
Article
em En
| MEDLINE
| ID: mdl-31628351
ABSTRACT
Doping of single-walled carbon nanotubes leads to the formation of new energy levels which are able to participate in optical processes. Here, we investigate (6,5)-single walled carbon nanotubes doped in a solution of hydrochloric acid using optical absorption, photoluminescence, and pump-probe transient absorption techniques. We find that, beyond a certain level of doping, the optical spectra of such nanotubes exhibit the spectral features related to two doping-induced levels, which we assign to a localized exciton [Formula see text] and a trion T, appearing in addition to an ordinary exciton [Formula see text]. We evaluate the formation and relaxation kinetics of respective states and demonstrate that the kinetics difference between E1 and X energy levels perfectly matches the kinetics of the state T. This original finding evidences the formation of trions through nonradiative relaxation via the [Formula see text] level, rather than via a direct optical excitation from the ground energy state of nanotubes.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Sci Rep
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Federação Russa