Optical Characterization of Undoped and Au-Doped MoS2 Single Crystals
Single crystals of undoped and Au-doped MoS2 were grown by the chemical vapor transport method using iodine as a transporting agent. The doping effect of the Au was characterized by temperature-dependent piezoreflectance (PzR) spectroscopy measurements in broad range of temperatures from 25 to 300 K. The temperature dependent PzR spectra revealed prominent features in the vicinity of direct-band-edge excitons for both investigated samples. The energies and broadening parameters of the A and B excitons were determined via a detailed line shape fit of the PzR spectra. We observed that Au doping strongly reduces the splitting between A and B excitons as well as it causes the redshift of observed transitions in relation to the undoped MoS2. The origin of observed excitons was discussed.
Bale V. Reddy, Shishir Kumar Sahu, A. Kandasamy and Manuel de La Sen
M. Sigiro et al., "Optical Characterization of Undoped and Au-Doped MoS2 Single Crystals", Applied Mechanics and Materials, Vol. 627, pp. 50-53, 2014