Fig. 5
From: Micro-Extinction Spectroscopy (MExS): a versatile optical characterization technique
Absorption spectra of different TMDs obtained by MExS. a Optical image of a MoS2 flake. The clear parts of the structure show monolayers, and darker lines show multilayers. b Integrated spectrum image of the transmission intensity. The black square shows the location from where the spectrum was taken, shown in d. c Simplified schematic of the band diagram of MoS2, depicting c1 as the lowest conduction band, and v1 and v2 as the highest split valence bands. A and B are the direct bandgap transitions, which are the source of the two exciton resonances in the absorption spectrum. d Absorption spectra of MoS2, MoSe2, WS2, and WSe2; each labeled with exciton resonances A and B