Unveiling the complex phonon nature and phonon cascades in 1L to 5L WSe₂ using multiwavelength excitation Raman scattering.

ABSTRACT: Tungsten diselenide (WSe₂) is a 2D semiconducting material, promising for novel optoelectronic and phononic applications. WSe₂ has complex lattice dynamics and phonon structure. Numerous discrepancies in the literature exist regarding the interpretation and identification of phonon modes. This work presents a complete investigation of the vibrational properties of 1L to 5L flakes and bulk WSe₂ using multi-wavelength Raman spectroscopy. We especially highlight measurements using 785 nm excitation, which have not been performed before. These allow us to solve inconsistences in the literature in terms of defect-activated non-Γ point single phonon modes and Breit-Wigner-Fano type resonance. We identify 35 Raman peaks per flake thickness, which we attribu

SUBMITTER: Blaga C 

PROVIDER: S-EPMC11325308 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature