Piezoreflectance study of Nb-doped MoS2 single crystals

Abstract

We have measured the temperature dependence of the spectral features in the vicinity of direct band-edge excitonic transition of the Nb-doped MoS2 single crystals from 25 to 300 K using piezoreflectance (PzR). The energies and broadening parameters of the A and B excitons of the Nb-doped MoS2 samples have been determined accurately via a detailed line shape fit of the PzR spectra. we can infer that the Nb ions are most likely intercalated between the van der Waals gap and stabilize the rhombohedral 3R phase of the MoS2 crystal.