Electronic structure and exciton shifts in Sb-doped MoS2 monolayer

Abstract

The effective manipulation of excitons is important for the realization of exciton-based devices and circuits, and doping is considered a good strategy to achieve this. While studies have shown that 2D semiconductors are ideal for excitonic devices, preparation of homogenous substitutional foreign-atom-doped 2D crystals is still difficult. Here we report the preparation of homogenous monolayer Sb-doped MoS 2 single crystals via a facile chemical vapor deposition method. A and B excitons are observed in the Sb-doped MoS 2 monolayer by reflection magnetic circular dichroism spectrum measurements. More important, compared with monolayer MoS 2 , the peak positions of two excitons show obvious shifts. Meanwhile, the degeneration of A exciton is also observed in the monolayer Sb-doped MoS 2 crystal using photoluminescence spectroscopy, which is ascribed to the impurity energy levels within the band-gap, confirmed by density function theory. Our study opens a door to developing the doping of 2D layered transition metal dichalcogenides with group-V dopants, which is helpful for the fundamental study of the physical and chemical properties of transition metal dichalcogenides.

Vanadium Dopants: A Boon or a Bane for Molybdenum Dichalcogenides‐Based Electrocatalysis Applications

“…Additionally, it was noted that E 1 2g and A 1g peaks for Mo 0.75 V 0.25 S 2 became broader and weaker, suggesting that the vanadium dopant might have caused some disruption to the MoS 2 crystal structure. [ 31,39–41 ] In Figure 3b, distinct peaks at ≈284 and ≈242 cm −1 , corresponding to the in‐plane E 1 2g and out‐of‐plane A 1g vibrational modes of MoSe 2 were noted, which corroborate well with the literature values for multilayered MoSe 2 . [ 34,42,43 ] Last, peaks at ≈162, ≈118, and ≈227 cm −1 corresponding to A 1g , E 1g , and E 1 2g of MoTe 2 were observed for the V‐doped MoTe 2 .…”

Visible Light-Driven Mn-MoS2/rGO Composite Photocatalysts for the Photocatalytic Degradation of Rhodamine B

“…e crystal structure of the 3%MMS/rGO composite was further verified by the FFT patterns and the SAED shown in Figures 2(h) and 2(i). e values of the lattice spacing are 2.82 and 1.61Å, which are corresponding to the (100) and (110) planes of 2H-MoS 2 , respectively [31], which both are confirmed in SAED pattern (Figure 2(i)). e halo ring and unclear dot arrangement in FFT and SAED patterns illustrate for the low crystallinity of the material.…”

Controlling neutral and charged excitons in MoS2 with defects

“…Previously, optical response of TMDs has been changed using applied bias and femtosecond light pulses that introduced large number of carriers and increased screening of the Coulomb interaction [7,33]. Generally, using p-type dopants caused a shift toward higher energies in excitonic peaks, whereas n-type dopant caused a shift toward lower energies in excitonic peaks [34,35].…”