We study photoluminescence (PL) spectra and exciton dynamics of the MoS2 monolayer (ML) grown by the chemical vapor deposition technique. In addition to the usual direct A-exciton line, we observe a low-energy line of bound excitons dominating the PL spectra at low temperatures. This line shows unusually strong redshift with an increase in the temperature and submicrosecond time dynamics suggesting indirect nature of the corresponding transition. By monitoring the temporal dynamics of exciton PL distribution in the ML plane, we observe diffusive transport of A-excitons and measure the diffusion coefficient up to 40 cm2/s at elevated excitation powers. The bound exciton spatial distribution spreads over tens of micrometers in μs. However, this spread is subdiffusive, characterized by a significant slowing down with time. The experimental findings are interpreted as a result of the interplay between the diffusion and Auger recombination of excitons.
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Spatiotemporal dynamics of free and bound excitons in CVD-grown MoS2 monolayer
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13 September 2021
Research Article|
September 13 2021
Spatiotemporal dynamics of free and bound excitons in CVD-grown MoS2 monolayer
M. A. Akmaev
;
M. A. Akmaev
a)
1
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
, Moscow 119991, Russia
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M. M. Glazov
;
M. M. Glazov
2
Ioffe Institute, Russian Academy of Sciences
, St. Petersburg 194021, Russia
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M. V. Kochiev
;
M. V. Kochiev
1
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
, Moscow 119991, Russia
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P. V. Vinokurov
;
P. V. Vinokurov
3
M.K. Ammosov North-Eastern Federal University
, Yakutsk 677000, Russia
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S. A. Smagulova
;
S. A. Smagulova
3
M.K. Ammosov North-Eastern Federal University
, Yakutsk 677000, Russia
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V. V. Belykh
V. V. Belykh
a)
1
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
, Moscow 119991, Russia
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Appl. Phys. Lett. 119, 113102 (2021)
Article history
Received:
July 14 2021
Accepted:
August 24 2021
Citation
M. A. Akmaev, M. M. Glazov, M. V. Kochiev, P. V. Vinokurov, S. A. Smagulova, V. V. Belykh; Spatiotemporal dynamics of free and bound excitons in CVD-grown MoS2 monolayer. Appl. Phys. Lett. 13 September 2021; 119 (11): 113102. https://doi.org/10.1063/5.0063372
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