Temperature-dependent phonon shifts in monolayer MoS2

Lanzillo, Nicholas A.; Birdwell, A. Glen; Amani, Matin; Crowne, F. J.; Shah, Pankaj; Najmaei, Sina; Liu, Zheng; Ajayan, Pulickel M.; Lou, Jun; Dubey, Madan; Nayak, Saroj K.; O’Regan, Terrance

doi:10.1063/1.4819337

Cited by 223 publications

(184 citation statements)

References 23 publications

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“…When the dimensionality is decreased, this peak splits into two, with the E 1 2g band at a frequency lower than that of the A 1g band and with greater intensity [79] Raman bands of mechanically exfoliated monolayer TMDCs show significant temperature dependence. The temperature coefficients (α) of the A 1g and E 1 2g modes of MoS 2 were found to be −0.0123 cm −1 K −1 and −0.0132 cm −1 K −1 , respectively [80][81][82]. The value of α for the A 1g mode in monolayer MoSe 2 is much smaller (−0.0045 × 10 −2 cm −1 K −1 ) than that of monolayer MoS 2 due to difference in the strain-phonon modes as revealed by first-principles calculations [77].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.

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Section: Raman Spectroscopymentioning

confidence: 99%

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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“…5,[23][24][25] Temperature dependent Raman scattering has been used to investigate the vibrational properties of both bulk and monolayer MoS2, and in general both E2g and A1g peaks exhibit redshift with increasing temperature. 2, [26][27][28] Besides the fundamental interest in the vibrational properties of the 2D material, we have shown that because of the expected nearly linear temperature dependence of the phonon frequencies for an idealistic 2D material in the elevated temperature region (above RT), the temperature dependent Raman study can be used as an effective probe to the film-substrate interaction. 2, 4, 29 For instance, in our previous work we have shown that the A1g mode, as well as the E2g mode to a less extent, shows an anomalous nonlinear temperature dependence due to temperature-induced changes in the film morphology and the interaction with the substrate.…”

Section: Introductionmentioning

confidence: 99%

In Situ Monitoring of the Thermal-Annealing Effect in a Monolayer of MoS2

Cao

et al. 2017

Phys. Rev. Applied

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We perform in-situ two-cycle thermal cycling and annealing studies for a transferred CVDgrown monolayer MoS2 on a SiO2/Si substrate, using spatially resolved micro-Raman and PL spectroscopy. After the thermal cycling and being annealed at 305 °C twice, the film morphology and film-substrate bonding are significantly modified, which together with the removal of polymer residues cause major changes in the strain and doping distribution over the film, and thus the optical properties. Before annealing, the strain associated with ripples in the transferred film dominates the spatial distributions of the PL peak position and intensity over the film; after annealing, the variation in film-substrate bonding, affecting both strain and doping, becomes the leading factor. This work reveals that the film-substrate bonding, and thus the strain and doping, is unstable under thermal stress, which is important for understanding the substrate effects on the optical and transport properties of the 2D material and their impact on device applications.

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“…However, in 1L-MoS 2 , the temperature coefficient of E was lower in magnitude than that of A 1 , which can be attributed to no interlayer interactions restricting the vibrations away from the basal plane. 124 Najmaei et al reported laser-induced thermal effects on the Raman spectra of MoS 2 with thickness ranging from 1L to bulk.…”

mentioning

confidence: 99%

Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material

et al. 2015

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Two-dimensional (2D) transition metal dichalcogenide (TMD) nanosheets exhibit remarkable electronic and optical properties. The 2D features, sizable bandgaps, and recent advances in the synthesis, characterization, and device fabrication of the representative MoS2, WS2, WSe2, and MoSe2 TMDs make TMDs very attractive in nanoelectronics and optoelectronics. Similar to graphite and graphene, the atoms within each layer in 2D TMDs are joined together by covalent bonds, while van der Waals interactions keep the layers together. This makes the physical and chemical properties of 2D TMDs layer dependent. In this review, we discuss the basic lattice vibrations of monolayer, multilayer, and bulk TMDs, including high-frequency optical phonons, interlayer shear and layer breathing phonons, the Raman selection rule, layer-number evolution of phonons, multiple phonon replica, and phonons at the edge of the Brillouin zone. The extensive capabilities of Raman spectroscopy in investigating the properties of TMDs are discussed, such as interlayer coupling, spin-orbit splitting, and external perturbations. The interlayer vibrational modes are used in rapid and substrate-free characterization of the layer number of multilayer TMDs and in probing interface coupling in TMD heterostructures. The success of Raman spectroscopy in investigating TMD nanosheets paves the way for experiments on other 2D crystals and related van der Waals heterostructures.

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Temperature-dependent phonon shifts in monolayer MoS2

Cited by 223 publications

References 23 publications

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

In Situ Monitoring of the Thermal-Annealing Effect in a Monolayer of MoS2

Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material

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