Optical spectroscopy of excitons in ReS2 monolayers grown by chemical vapor deposition
arxiv(2024)
摘要
Monolayers of ReS2 were grown by a chemical vapor deposition technique on
SiO2/Si substrates and investigated at room temperature by using micro-Raman,
micro-photoluminescence (PL) and absorbance spectroscopies. The Raman
scattering spectrum exhibits several phonon modes that were confirmed by the
computation analysis based on the density functional theory. The ReS2
structural integrity was confirmed by using the XRD and the energy dispersion
spectroscopy that was obtained by the scanning electron microscopy.
Photoluminescence spectra show excitons related to interband transition in thin
monolayer flakes and bulk-like structures. Additionally, a sharp PL line
located at 1.2620 eV with a second harmonic peak at 2.5420 eV were observed and
explained in terms of interband excitonic transitions originated within the
rhenium 5d orbit. An optical absorbance spectrum with an exciton peak around
1.4660 eV was obtained for an assembly of ReS2 flakes grown on silica
substrate.
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