Observation of a Burstein–Moss Shift in Rhenium-Doped MoS₂ Nanoparticles

Abstract

We investigated the optical properties of rhenium-doped MoS2 nanoparticles and compared our findings with the pristine and bulk analogues. Our measurements reveal that confinement softens the exciton positions and reduces spin-orbit coupling, whereas doping has the opposite effect. We model the carrier-induced exciton blue shift in terms of the Burstein-Moss effect. These findings are important for understanding doping and finite length scale effects in low-dimensional nanoscale materials.

Burstein-Moss Effect Behind Au Surface Plasmon Enhanced Intrinsic Emission of ZnO Microdisks

“…Also, it can be well known that the magnitude of BM shift (∆ BM ) from free-electron theory is proportional to n e 2/3 , where n e is the electron carrier concentration1011. For examples, BM effect induced blue shift of the optical band gap has been observed in the Al-doped ZnO films12 and nanowires (NWs)13, Si and Ge-doped GaN14, and Re-doped MoS 2 NPs15. Recently, Liu et al 9.…”

Bandgap Widening of Phase Quilted, 2D MoS2 by Oxidative Intercalation

“…[ 10,14,[20][21][22][23][24] For example, the photoluminescence (PL) spectra of 1L-MoS 2 prepared through a molecular chemical doping technique showed 0.2 eV widening of the bandgap. [ 15,16 ] By alloying two materials with different bandgaps, [ 23,25 ] a tunable bandgap from 0.8 to 1.2 eV was obtained in 2D alloys. It is worth noting that theoretical calculations have predicted that the Adv.…”

Doping of Fullerene‐Like MoS2 Nanoparticles with Minute Amounts of Niobium

“…The shift could be ascribed to the intralayer structural strains . Furthermore, the Re‐doping of the IF nanoparticles was shown to produce a blue shift which was attributed to the Burstein–Moss effect, i.e., to band‐filling . The shift of exciton A is smaller compared to the shift of the B exciton, which indicates that the latter is more sensitive to confinement and is strongly perturbed by formation of the IF structure …”

“…[41] Furthermore, the Re-doping of the IF nanoparticles was shown to produce a blue shift which was attributed to the Burstein-Moss effect, i.e., to band-filling. [42] The shift of exciton A is smaller compared to the shift of the B exciton, which indicates that the latter is more sensitive to confinement and is strongly perturbed by formation of the IF structure. [43] Perhaps the most striking difference between the undoped (and Re-doped) NP is the smaller spin-orbit splitting of the Nb-doped IF.…”