Optical properties of thin layers of rhenium diselenide () with thicknesses ranging from mono- (1 ML) to nona-layer (9 MLs) are demonstrated. The photoluminescence (PL) and Raman scattering were measured at low () and room () temperature, respectively. The PL spectra of 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 , 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 flakes in the few-layer limit.
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28 July 2020
Research Article|
July 30 2020
The optical signature of few-layer ReSe2
Special Collection:
Beyond Graphene: Low Symmetry and Anisotropic 2D Materials
Ł. Kipczak
;
Ł. Kipczak
Institute of Experimental Physics, Faculty of Physics, University of Warsaw
, ul. Pasteura 5, 02-093 Warsaw, Poland
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M. Grzeszczyk
;
M. Grzeszczyk
Institute of Experimental Physics, Faculty of Physics, University of Warsaw
, ul. Pasteura 5, 02-093 Warsaw, Poland
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K. Olkowska-Pucko
;
K. Olkowska-Pucko
Institute of Experimental Physics, Faculty of Physics, University of Warsaw
, ul. Pasteura 5, 02-093 Warsaw, Poland
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A. Babiński
;
A. Babiński
Institute of Experimental Physics, Faculty of Physics, University of Warsaw
, ul. Pasteura 5, 02-093 Warsaw, Poland
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M. R. Molas
M. R. Molas
a)
Institute of Experimental Physics, Faculty of Physics, University of Warsaw
, ul. Pasteura 5, 02-093 Warsaw, Poland
a)Author to whom correspondence should be addressed: maciej.molas@fuw.edu.pl
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a)Author to whom correspondence should be addressed: maciej.molas@fuw.edu.pl
Note: This paper is part of the Special Topic on Beyond Graphene: Low Symmetry and Anisotropic 2D Materials.
J. Appl. Phys. 128, 044302 (2020)
Article history
Received:
May 27 2020
Accepted:
July 17 2020
Citation
Ł. Kipczak, M. Grzeszczyk, K. Olkowska-Pucko, A. Babiński, M. R. Molas; The optical signature of few-layer ReSe2. J. Appl. Phys. 28 July 2020; 128 (4): 044302. https://doi.org/10.1063/5.0015289
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