Fig. 1: Raman scattering for monolayer WS2.
From: Investigating heterogeneous defects in single-crystalline WS2 via tip-enhanced Raman spectroscopy
a Schematic of single-crystalline hexagonal WS2 monolayer. b Schematic of STM-based TERS system with a gap-mode configuration. STM-TERS measurements were performed at a constant-current mode by applying a bias voltage of 50 mV to the sample. c Confocal Raman map of A1g peak area intensity with PL background (acquisition time per point: 1 s). d Distribution image of A1g peak from the Raman map in (c). The white and black dashed lines in c and d indicate the domain boundaries and edges of WS2. Confocal Raman spectra from e α-domain, f β-domain, g edge of α-domain, and h edge of β-domain. The spectra were extracted from each colored cross in (c).
