Micro-Raman for compositions characterization of selective area growth of AlxGayIn1−x−yAs materials by metal-organic vapor-phase epitaxy

Hamady, Sidi Ould Saad; Dupuis, N.; Décobert, J.; Ougazzaden, A.

doi:10.1016/j.jcrysgro.2008.06.080

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…Both of them demonstrate blue shift and become the dominant peaks at higher x values. It is noted that an alloy disorder-related peak [29] positioned in between peaks II and III is also observed for the mixed ternary Mo x W 1-x S 2 samples. The dependence of the wavenumbers of the Raman-active modes on the composition of Mo x W 1-x S 2 layered mixed crystalsare depicted in Fig.…”

Section: Advanced Materials Engineering and Technology IIImentioning

confidence: 77%

Raman Scattering Characterization of MoxW1-xS2 Layered Mixed Crystals

Sigiro²,

Fahmi

2015

AMM

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A systematic study of a series of MoxW1-xS2layered mixed crystals, with 0 ≥ x ≤ 1, grown by the chemical vapor transport method were carried out by using Raman scattering measurements. The peaks of the two dominant first-order Raman-active modes,A1gand E2g1 , and several second-order bands have been observed in the range of 150-500 cm-1. The peaks corresponding toA1gmode show one-mode type behavior while the peaks of E2g1 mode demonstrate two-mode type behavior for the entire series. The results can be explained on the basis of the atomic displacements for each mode. ForA1gmode only sulfur atoms vibrate and this give rise to a one-mode type behavior for the mixed crystals. For E2g1 mode metal atoms also vibrate as well as sulfur atoms, the mass difference of the vibrating Mo and W cations causes the two-mode type behavior of E2g1 mode. In addition, the observation of largest asymmetry and broadening ofA1gmode for Mo0.5W0.5S2has been attributed to random alloy scattering.

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Section: Advanced Materials Engineering and Technology IIImentioning

confidence: 77%

Raman Scattering Characterization of MoxW1-xS2 Layered Mixed Crystals

Sigiro²,

Fahmi

2015

AMM

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Raman study of 2H-Mo1−xWxS2 layered mixed crystals

Dumcenco

Chen

Wang

et al. 2010

Journal of Alloys and Compounds

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Composition-dependent Raman modes of Mo_1−xW_xS₂ monolayer alloys

et al. 2014

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Two-dimensional (2D) transition-metal dichalcogenide alloys with tunable band gaps have promising applications in nanoelectronics and optoelectronics. Characterization of structures of 2D alloys, such as composition and atom mixing, is of fundamental importance to their applications. Here, we have conducted systematic Raman spectroscopic studies on Mo1-xWxS2 monolayers (0 ≤x≤ 1). First-order Raman modes and second-order Raman modes have been observed in the range of 100-480 cm(-1) in the 2D alloys. The out-of-plane A1' modes and in-plane E' modes showed one-mode and two-mode behaviors, respectively. The broadening of A1' and E' modes in the alloys has been observed. The disorder-related Raman peaks at ∼360 cm(-1) were only observed in the 2D alloys but not in the two end materials. Modified random-element-isodisplacement (MREI) model has been adopted to successfully predict mode behaviors of A1' and E' modes in the monolayer alloys. Further, composition-dependent A1' and E' frequencies can be well fitted by the MREI model, giving composition-dependent force constants.

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Micro-Raman for compositions characterization of selective area growth of AlxGayIn1−x−yAs materials by metal-organic vapor-phase epitaxy

Cited by 4 publications

References 10 publications

Raman Scattering Characterization of Mo<sub>x</sub>W<sub>1-x</sub>S<sub>2</sub> Layered Mixed Crystals

Raman Scattering Characterization of Mo<sub>x</sub>W<sub>1-x</sub>S<sub>2</sub> Layered Mixed Crystals

Raman study of 2H-Mo1−xWxS2 layered mixed crystals

Composition-dependent Raman modes of Mo_1−xW_xS₂ monolayer alloys

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Micro-Raman for compositions characterization of selective area growth of AlxGayIn1−x−yAs materials by metal-organic vapor-phase epitaxy

Cited by 4 publications

References 10 publications

Raman Scattering Characterization of Mo<sub>x</sub>W<sub>1-x</sub>S<sub>2</sub> Layered Mixed Crystals

Raman Scattering Characterization of Mo<sub>x</sub>W<sub>1-x</sub>S<sub>2</sub> Layered Mixed Crystals

Raman study of 2H-Mo1−xWxS2 layered mixed crystals

Composition-dependent Raman modes of Mo1−xWxS2 monolayer alloys

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Composition-dependent Raman modes of Mo_1−xW_xS₂ monolayer alloys