Photoexcitation Carrier Kinetics in WSe<sub>2</sub> Nanolayers in the Vicinity of the Band Edge

Shestakova, A. P.; Lavrov, S. D.; Brekhov, Kirill; Ilyin, N. A.; Kudryavtsev, A. A.; Мишина, Е. Д.; Kulyuk, L.

doi:10.1002/pssb.201700259

Cited by 5 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the presence of exciton states, the sample optical response can be described using the model proposed in [14]. Moreover, it allowed determining the regularities of optical coefficients change for semiconductor materials (and, respectively, the induced reflectivity).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Two-dimensional WSe2 flakes under high power optical excitation

Brekhov¹,

Lavrov²,

Kudryavtsev³

et al. 2021

MoEM

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

“…A modified pump-probe technique was used for the experimental studies [14,15]. Radiation with a wavelength of 400 nm (photon energy 3.1 eV) was used as a pump, which allowed effective carriers excitation from the valence band into the conduction band.…”

Section: Methodsmentioning

confidence: 99%

Two-dimensional WSe2 flakes under high power optical excitation

Brekhov¹,

Lavrov²,

Kudryavtsev³

et al. 2021

MoEM

View full text Add to dashboard Cite

show abstract

“…The contributions (in total an amount of 30) of this Special Issue are covering research work related to production, characterization and application of the nanocarbon materials which include diamonds, carbon nanotubes, graphene other types of nanocarbon materials, and their composites . Traditionally for the NPO Workshop series there is also some portion of reports devoted to non‐carbon materials demonstrating properties and phenomena analogous to those observed for nanocarbons.…”

mentioning

confidence: 99%

“…The papers presented by Tarasenko et al and Shestakova et al undoubtedly demonstrate that unique photonic and optoelectronic properties are internally inherent to layered nanomaterials. This discussion about general features and effects provides important motivations for the investigation of graphene‐like materials.…”

mentioning

confidence: 99%