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WS2 PL WS2 Monolayer PL WSe2 PL Laser WS2 Bilayer WS2 PL Single Layer WSe2 PL Spectrum WSe2 Raman with Layer WS2 PL Spectra WS2 PL Peak WS2 PL Layer Thickness WS2 Her WS2 PL Fwhm Multilayer WS2 PL WS2 XRD WS2 Inse WS2 532 PL WS2 PL Lifetime Few-Layer WS2 Band Gap WSe2 Wafer WS2 PL Diagram EPR WS2 Pl. of WS2 Nature UPL of WSe2 WS2 PL Moonolayer Pl. of WS2 Monolayer On AU Film Pl. of WS2 at 5K WS2 Graphene PL WS2 Raman Polarzation WS2 Layerd Stucture Double Layer WS2 SHG Stacking of WSe2 and WS2 Layers WS2 Grating PL WS2 WSe2 Atoms WS2 Raman Mapping WS2 Mulitpalyer PL WS2 On MoSe2 PL WS2 Raman Layer Depandecnt WS2 Back Gate PL PL MoSe2 Layer Number Monolayer WS2 Split PL Peak Trpl WS2 WS2 PL Low Temperature Single Layer WS2 Morphology Sem WSe2 Layer Cross Section WS2 MoS2 Heterostructure WS2 Valley WS2 Parameter Monolayer WS2 Defect PL Peak Bulk WS2 Absorption MoSe2 WS2 Reflectance