Temperature dependence piezoreflectance study of the effect of doping MoS2with rhenium

We have recorded piezoreflectance (PzR) spectra at 15 K over the energy ran ge 1.5-2.5 eV for undoped, 0.5% and 1% rhenium-doped (Re-doped) MoS2 single crystals to examine the effect of dopant on the spectral features near the direct band- edge excitonic transitions. More elaborate temperature depend ences of the excitonic features A and B of the Re-doped MoS2 single crystal s in the range 15 to 300 K have also been obtained using PzR. The energies and broadening parameters of the A and B excitons of the Re-doped MoS2 samp les have been determined accurately via a detailed Line shape fit of the Pz R spectra. The parameters that describe the temperature variation of the en ergies and broadening functions of the excitonic transitions are analysed. A plausible suggestion will be put forth to explain the role of rhenium in affecting the variation of the excitonic transitions.