In Fig. 2c, laser power of 2.5 mW is used to thin the MoS2 bulk film down to a trilayer after an exposure time of 0.2 s at each pixel (0.2 µm × 0.2 µm), which is identified by observing the evolution of the Raman peak interval from 25.2 cm−1 ...
Low-temperature PL spectra clearly show the difference between the pristine and treated monolayers, as shown in Fig.1c,d. They represent monolayers and multilayers with an S vacancy yield that has an even stronger PL intensity. The emergence of the bound peak (XborXD) in the PL spectra for ...
Our method allows, for the first time, to quantitatively compare the impact of strain on excitonic and Raman peak positions on identically-synthesized 2D-MoS2. Strain leads to average Red-shifts of ~ 30 meV in the A-exciton position, and ~ 2 cm-1 in the E12g Raman peak in these ...
. According to Raman spectra and PL spectrum, we found that the MoS 2 was n type doped on the SiO 2 /Si substrate. However, the sapphire substrate does not introduce doping to MoS 2 nanosheet. After annealing in Ar and Ar+S atmosphere, it is discovered that when S is added, par...
potential method for simulating Raman spectra of defective materials and apply it to monolayer MoS2 with random distributions of Mo and S vacancies. We study to what extent the types of vacancies can be distinguished and provide insight into the origin of different evolutions of Raman ...
Raman spectroscopycrystallographic orientationlattice vibrationsThe false-color (3D type) image of the intensity of the Raman spectra of monolayer MoS2 versus both peak positions and polar angles is plotted. It shows that the strongest E2g1+ and E2g1 peaks appear at different angles, reflected as...
(temperature uniformity, gas distribution uniformity). In this work, we used a tube furnace as shown in Fig.9to anneal chips of 2.5 × 2.5 cm2the uniformity of which was assessed by Raman mapping as presented in Supplementary Fig.3showing the peak separation and the FWHM ofE2gandA1g...
We have measured the impact of ad-atoms on MoSusing photoluminescence (PL) and Raman spectroscopy. We find that ad-atoms induce a new peak in the PL spectra, indicating that excitons are bound at the ad-atom sites. Our results will be discussed in light of recent density functional theory...
Vertically stacked Van der Waals heterojunctions of atomically thin transition metal dichalcogenides (TMDs) offer new physical properties and new strategies for designing novel device functionalities that are vastly different from homostructured TMDs. The Raman intensity is strongest and frequency difference ...
Raman lines (blue curve) and the PL intensity (dashed, orange curve) are analysed. The extracted Raman peak-to-peak values δ are printed as a color coded band (top). All signals are obtained by averaging over spectra from three adjacent probing positions. (b–d) Raman and PL mapping ...