Abstract
The temperature dependences of the spectral features in the vicinity of directband-edge excitonic transitions for rhenium-doped (Re-doped) and undopedWS2 single crystals are measured over a temperature range of 15–300 K using piezoreflectance(PzR). From a detailed line shape fit of the PzR spectra, the temperature dependences ofthe energies and broadening parameters of the A and B excitons are determined accurately.The A and B excitonic transition energies show a red shift and a reduction of their splittingdue to the presence of a small amount of Re and the broadening parameter of theexcitonic transition features increases due to impurity scattering. The broader linewidth and the nature of the two-dimensional Mott–Wannier excitons of the 3Rpolytype prevent the detection of higher Rydberg series for the Re-doped samples.The parameters that describe the temperature variations of the energies andbroadening functions of the excitonic transitions are evaluated and discussed.
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