Jul 10, 2020 · Here, we present an advanced approach based on ellipsometry measurements for retrieval of dielectric functions and the excitonic properties of both monolayer and bulk TMDs. Using this method, we...

Nov 12, 2013 · We demonstrate the tunability of the photoluminescence (PL) properties of monolayer (1L)-MoS 2 via chemical doping. The PL intensity of 1L-MoS 2 was drastically enhanced by the adsorption of p-type dopants with high electron affinity but reduced by the adsorption of n-type dopants.

Apr 3, 2020 · The photoluminescence (PL) of 1L-MoS2 degrades due to aging-related defect formation. The passivation of these defects leads to substantial improvement in optical properties. Here, we report the enhancement of PL on aged 1L-MoS2 by laser treatment.

Mar 15, 2010 · Bulk MoS 2, a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS 2 crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system.

Our studies have shown that exposing bulk molybdenum patterns to 10 mW of laser power for about 2s results in the minimal formation of MoO2 which coincides with high quality mono- to few-layer...

Optical characterizations of silver nanoparticles decorated on exfoliated MoS2 nanosheet were done using UV-VIS spectrophotometry and photoluminescence (PL) spectroscopy.

Sep 1, 2021 · The low PL intensity showed by bulk MoS 2 is due to the weak phonon interaction and strong excitonic absorption, which is bigger than its indirect bandgap [9]. This unusual behavior can be attributed to the quantum confinement of the electrons in d orbitals.

Dec 2, 2024 · As a result of indirect band gap, bulk MoS 2 exhibits negligible quantum yield for photoluminescence (PL). However, monolayer MoS 2 exhibits a direct band gap with the valence band maxima and conduction band minima both at high-symmetric K-points.

Photoluminescence (PL): In the bulk form (2H-MoS2), molybdenum disulfide possess indirect band-gap at 1.3eV. Therefore, PL measurements cannot probe the band-gap directly. However, after illuminating with high laser intensity (hot photoluminescence) PL shows peak at 1.3eV.

Jan 16, 2025 · For PL imaging a low groove density grating is used to obtain the broad PL peak. The intensity of the PL band decreases with increasing layer number and bulk MoS 2 produces no PL signal at all. This effect is due to the indirect to direct band gap transition which occurs as we go from bulk MoS 2 to few-layer MoS 2 .