Exciton and trion in few-layer MoS2: Thickness- and temperature-dependent photoluminescence

Trion induced photoluminescence of a doped MoS2 monolayer

“…This asymmetry has been observed in earlier experiments. 32,[65][66][67][68][69][70][71][72] The total width of the peak increases with T, which has also been noted in the measurements. 32,71,72 Details of the temperature and the doping dependence of the trion peak are shown in Fig.…”

Theoretical study of Raman scattering in MoS2xSe2(1 − x) layered alloys

“…[43][44][45] Remarkably, the change in the wavenumber positions with the thickness variation is monotonic, and thus, it can be used as a 'thickness indicator'. [5,24,[43][44][45][46] The outof-plane A 1g mode is more influenced by decreasing the layer number than the in-plane E 1 2g mode. The increase in the A 1g mode wavenumber with increasing the number of layers is attributed to the interlayer vdW interaction strengthening and stiffening of the MoS 2 crystal as a whole.…”

“…We will make calculations for well-known MoS 2 and MoSe 2 crystals, which possess two fundamental Raman bands A 1g and E 1 2g in the spectrum. [1,5,16,[43][44][45][46] Let us consider the nature of the mentioned vibration modes. Dumcenco et al [29] studied Raman scattering in a series of Mo 1 − x W x S 2 layered alloyed crystals with 0 ≤ x ≤ 1.…”

“…The electronic band structure of 2D crystals differs from that of the bulk, and they demonstrate intense absorption and luminescence originated from direct-bandgap exciton and trion. [1][2][3][4][5][6][7] The variety of discovered 2D materials is also fostering the development of novel hybrid structures. [8][9][10][11] 2D compounds have attracted interest for fundamental studies and applications in high-end electronics, spintronics, optoelectronics, energy harvesting, and flexible electronics.…”

“…[1][2][3] They can be used as a new generation of transistors, chips, detectors, emitters, Esaki diodes, memory devices, and so forth. [1][2][3][4][5][6][7][8][9][10][11][12][13] The main advantage of 2D materials is the dependence of their optical and electrical characteristics on the number of layers and on the strong intralayer interaction through covalent bond and the weak interlayer interaction through van der Waals (vdW) attraction. The distinctive interatomic forces in layered structures manifest themselves with typical features in their phonon spectra, for example, the weak dispersion of phonon branches in some directions in the Brillouin zone and the appeared low-wavenumber interlayer modes.…”