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Two-dimensional WSe2 flakes under high power optical excitation

Kirill Brekhov 1
Kirill Brekhov
,  , 
Andrey Kudryavtsev 1
Andrey Kudryavtsev
, 
Nikita Ilyin1 1
Nikita Ilyin1
1 MIREA – Russian Technological University, 78 Vernadsky Ave., Moscow 119454, Russia
10.3897/j.moem.7.3.74274
Published 30 September 2021
Communication , Volume 7, Issue 3, 109-113
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Brekhov K. et al. Two-dimensional WSe2 flakes under high power optical excitation // Modern Electronic Materials. 2021. Vol. 7. No. 3. pp. 109-113.
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Brekhov K., Lavrov S., Kudryavtsev A., Ilyin1 N. Two-dimensional WSe2 flakes under high power optical excitation // Modern Electronic Materials. 2021. Vol. 7. No. 3. pp. 109-113.
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TY - JOUR
DO - 10.3897/j.moem.7.3.74274
UR - https://moem.colab.ws/publications/10.3897/j.moem.7.3.74274
TI - Two-dimensional WSe2 flakes under high power optical excitation
T2 - Modern Electronic Materials
AU - Brekhov, Kirill
AU - Lavrov, Sergey
AU - Kudryavtsev, Andrey
AU - Ilyin1, Nikita
PY - 2021
DA - 2021/09/30
PB - НИТУ МИСИС
SP - 109-113
IS - 3
VL - 7
ER -
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@article{2021_Brekhov,
author = {Kirill Brekhov and Sergey Lavrov and Andrey Kudryavtsev and Nikita Ilyin1},
title = {Two-dimensional WSe2 flakes under high power optical excitation},
journal = {Modern Electronic Materials},
year = {2021},
volume = {7},
publisher = {НИТУ МИСИС},
month = {Sep},
url = {https://moem.colab.ws/publications/10.3897/j.moem.7.3.74274},
number = {3},
pages = {109--113},
doi = {10.3897/j.moem.7.3.74274}
}
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Brekhov, Kirill, et al. “Two-dimensional WSe2 flakes under high power optical excitation.” Modern Electronic Materials, vol. 7, no. 3, Sep. 2021, pp. 109-113. https://moem.colab.ws/publications/10.3897/j.moem.7.3.74274.
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Keywords

carriers lifetime
graphene-like semiconductors
time-resolved spectroscopy
transition metal dichalcogenides

Abstract

Quasi-2D layers of transition metal dichalcogenides are promising candidates for creating saturable absorbers for pulsed lasers. However, the peculiarities of intense electromagnetic radiation’s influence on such structures have not been thoroughly studied. This paper explores the dynamics of photoexcited carriers in WSe2 flakes through experimental studies. These studies found that WSe2 flakes significantly change their optical properties under the influence of a high-power optical pump, allowed estimating the thermalization time of these structures (about 2 ps), and found that full relaxation takes more than 10 ps. The concentration of carriers in the semiconductor surface layer was estimated to be about 1028 m–3. It was found that standard description models of the optical response based on exciton resonances and absorption by free carriers could not adequately describe the experiments’ results. Thus, for an accurate description of the optical response, it was necessary to consider the effects associated with Coulomb screening that are caused by the high concentration of photo-excited carriers of the optical pumping densities used in this experiment.

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