The optical signature of few-layer ReSe2

Optical properties of thin layers of rhenium diselenide ( ReSe 2) with thicknesses ranging from mono- (1 ML) to nona-layer (9 MLs) are demonstrated. The photoluminescence (PL) and Raman scattering were measured at low ( T = 5 K) and room ( T = 300 K) temperature, respectively. The PL spectra of ReSe...

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Bibliographic Details
Published in:Journal of applied physics 2020-07, Vol.128 (4)
Main Authors: Kipczak, Ł., Grzeszczyk, M., Olkowska-Pucko, K., Babiński, A., Molas, M. R.
Format: Article
Language:English
Subjects:
Applied physics
Blue shift
Optical properties
Photoluminescence
Raman spectra
Rhenium
Thickness
Thin films
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Summary:Optical properties of thin layers of rhenium diselenide ( ReSe 2) with thicknesses ranging from mono- (1 ML) to nona-layer (9 MLs) are demonstrated. The photoluminescence (PL) and Raman scattering were measured at low ( T = 5 K) and room ( T = 300 K) temperature, respectively. The PL spectra of ReSe 2 layers display two well-resolved emission lines, which blueshift by about 120 meV when the layer thickness decreases from 9 MLs to a monolayer. A rich structure of the observed low-energy Raman scattering modes can be explained within a linear chain model. The two phonon modes of intralayer vibrations, observed in Raman scattering spectra at about 120 cm − 1, exhibit very sensitive and opposite evolution as a function of layer thickness. It is shown that their energy difference can serve as a convenient and reliable tool to determine the thickness of ReSe 2 flakes in the few-layer limit.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0015289