Symmetry-dependent phonon renormalization in monolayer MoS2 transistor

Abstract

Strong electron-phonon interaction which limits electronic mobility of semiconductors can also have significant effects on phonon frequencies. The latter is the key to the use of Raman spectroscopy for nondestructive characterization of doping in graphene-based devices. Using in-situ Raman scattering from single layer MoS${}_2$ electrochemically top-gated field effect transistor (FET), we show softening and broadening of A${}_{1g}$ phonon with electron doping whereas the other Raman active E${}_{2g}^1$ mode remains essentially inert. Confirming these results with first-principles density functional theory based calculations, we use group theoretical arguments to explain why A${}_{1g}$ mode specifically exhibits a strong sensitivity to electron doping. Our work opens up the use of Raman spectroscopy in probing the level of doping in single layer MoS${}_2$-based FETs, which have a high on-off ratio and are of enormous technological significance.

5 pages, 3 figures

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Cited by in corpus (19)

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• Ultrafast Dynamics of Defect-Assisted Electron-Hole Recombination in Monolayer MoS2
• Band Gap Engineering with Ultralarge Biaxial Strains in Suspended Monolayer MoS2
• Covalent Nitrogen Doping and Compressive Strain in MoS2 by Remote N2 Plasma Exposure
• Influence of Stoichiometry on the Optical and Electrical Properties of Chemical Vapor Deposition Derived MoS${}_2$
• Observation of Low-frequency Interlayer Breathing Modes in Few-layer Black Phosphorus
• The Effect of Preparation Conditions on Raman and Photoluminescence of Monolayer WS2
• Double resonance Raman modes in mono- and few-layer MoTe${}_2$
• Newly observed first-order resonant Raman modes in few-layer MoS${}_2$
• Photogating of mono- and few-layer MoS2
• Hot-electron cooling by acoustic and optical phonons in monolayers of MoS${}_2$ and other transition-metal dichalcogenides
• Effect of modulations of doping and strain on the electron transport in monolayer MoS_2
• In-Situ Monitoring of Thermal Annealing Induced Evolution in Film Morphology and Film-Substrate Bonding in a Monolayer MoS2 Film
• Metallic monoclinic phase in VO${}_2$ induced by electrochemical gating: in-situ Raman study
• Large-area Epitaxial Monolayer MoS2
• Directly grown monolayer MoS2 on Au foils as efficient hydrogen evolution catalysts
• Insights into vibrational and electronic properties of MoS${}_2$ using Raman, photoluminescence and transport studies
• Nonlinear Raman Shift Induced by Exciton-to-Trion Transformation in Suspended Trilayer MoS2