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

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.