Resonant Raman and photoluminescence spectra of suspended molybdenum disulfide

Abstract

Raman and photoluminescence (PL) measurements were performed on suspended and supported MoS2 up to 6 trilayers (TLs). The difference in the dielectric environment of suspended and supported MoS2 does not lead to large differences in the PL or Raman spectra. Most of the apparent difference in the PL intensity can be explained by the interference effect except for 1TL MoS2. The positions of the Raman peaks are not much different between suspended and supported MoS2. The relative intensities, on the other hand, show some differences between suspended and supported samples. In particular, the inter-layer vibration modes are enhanced near resonance with C excitons, with the breathing modes becoming relatively stronger. Up to 4 breathing modes are resolved in suspended 6TL MoS2.

18 pages, 4 figures

References in corpus (12)

• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Valley polarization in MoS2 monolayers by optical pumping
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• Probing excitonic states in ultraclean suspended two-dimensional semiconductors by photocurrent spectroscopy
• Interference effect on Raman spectrum of graphene on SiO_2/Si
• Anomalous excitonic resonance Raman effects in few-layer MoS2
• Double resonance Raman modes in mono- and few-layer MoTe${}_2$
• Newly observed first-order resonant Raman modes in few-layer MoS${}_2$
• Second order resonant Raman scattering in single layer tungsten disulfide (WS${}_2$)
• Group Theory analysis of phonons in two-dimensional Transition Metal Dichalcogenides

Cited by in corpus (9)

• Resonance effects in the Raman scattering of mono- and few layers MoSe${}_2$
• Davydov splitting and excitonic resonance effects in Raman spectra of few-Layer MoSe2
• Raman Signatures of Polytypism in Molybdenum Disulfide
• Spectroscopic Evaluation of Charge-transfer Doping and Strain in Graphene/MoS2 Heterostructures
• A library of ab initio Raman spectra for automated identification of 2D materials
• Large-Scale Arrays of Single- and Few-Layer MoS2 Nanomechanical Resonators
• The edge delamination of monolayer transition metal dichalcogenides
• Rigid-layer Raman-active modes in $N$-layer Transition Metal Dichalcogenides: interlayer force constants and hyperspectral Raman imaging
• Breathing modes in few-layer MoTe${}_2$ activated by h-BN encapsulation