Details
| Original language | English |
|---|---|
| Pages (from-to) | 16597–16606 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry C |
| Volume | 128 |
| Issue number | 39 |
| Early online date | 20 Sept 2024 |
| Publication status | Published - 3 Oct 2024 |
Abstract
Colloidal synthesis opened up a versatile way to tailor two-dimensional transition metal dichalcogenides. In particular, the huge oscillator strength of excitons in colloidal MoS2 makes the material appealing for excitonic devices. In this context, we studied ultrafast excitons with transient absorption (TA) spectroscopy in MoS2 nanosheets (NSs, 22 ± 9 nm) and nanoplatelets (NPLs, 8 ± 4 nm) with NPLs providing additional lateral confinement of excitons in the structures. Carrier relaxation mechanisms are identified by extending the TA setup with a custom micro cryostat and by extracting time-dependent line shapes. The exciton lifetime in MoS2 NSs almost doubles from 12 to 22 ps by cooling the samples from 295 to 9 K, which is attributed to phonon scattering. Temperature-dependent recombination dynamics are found for the sparsely studied C and D excitons, thus covering the full visible spectrum by time-resolved characterization. For smaller MoS2 NPLs, the A exciton signature reappears at cryogenic temperatures, allowing laterally confined excitons in MoS2 to be extensively studied for the first time.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 128, No. 39, 03.10.2024, p. 16597–16606.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ultrafast Recombination Dynamics under Lateral Confinement and Cryogenic Temperatures in Colloidal MoS2
AU - Frauendorf, André Philipp
AU - Niebur, André
AU - Rudolph, Dominik
AU - Oestreich, Michael
AU - Lauth, Jannika
AU - Hübner, Jens
N1 - Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
PY - 2024/10/3
Y1 - 2024/10/3
N2 - Colloidal synthesis opened up a versatile way to tailor two-dimensional transition metal dichalcogenides. In particular, the huge oscillator strength of excitons in colloidal MoS2 makes the material appealing for excitonic devices. In this context, we studied ultrafast excitons with transient absorption (TA) spectroscopy in MoS2 nanosheets (NSs, 22 ± 9 nm) and nanoplatelets (NPLs, 8 ± 4 nm) with NPLs providing additional lateral confinement of excitons in the structures. Carrier relaxation mechanisms are identified by extending the TA setup with a custom micro cryostat and by extracting time-dependent line shapes. The exciton lifetime in MoS2 NSs almost doubles from 12 to 22 ps by cooling the samples from 295 to 9 K, which is attributed to phonon scattering. Temperature-dependent recombination dynamics are found for the sparsely studied C and D excitons, thus covering the full visible spectrum by time-resolved characterization. For smaller MoS2 NPLs, the A exciton signature reappears at cryogenic temperatures, allowing laterally confined excitons in MoS2 to be extensively studied for the first time.
AB - Colloidal synthesis opened up a versatile way to tailor two-dimensional transition metal dichalcogenides. In particular, the huge oscillator strength of excitons in colloidal MoS2 makes the material appealing for excitonic devices. In this context, we studied ultrafast excitons with transient absorption (TA) spectroscopy in MoS2 nanosheets (NSs, 22 ± 9 nm) and nanoplatelets (NPLs, 8 ± 4 nm) with NPLs providing additional lateral confinement of excitons in the structures. Carrier relaxation mechanisms are identified by extending the TA setup with a custom micro cryostat and by extracting time-dependent line shapes. The exciton lifetime in MoS2 NSs almost doubles from 12 to 22 ps by cooling the samples from 295 to 9 K, which is attributed to phonon scattering. Temperature-dependent recombination dynamics are found for the sparsely studied C and D excitons, thus covering the full visible spectrum by time-resolved characterization. For smaller MoS2 NPLs, the A exciton signature reappears at cryogenic temperatures, allowing laterally confined excitons in MoS2 to be extensively studied for the first time.
UR - http://www.scopus.com/inward/record.url?scp=85204738521&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.4c04581
DO - 10.1021/acs.jpcc.4c04581
M3 - Article
AN - SCOPUS:85204738521
VL - 128
SP - 16597
EP - 16606
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 39
ER -