Polarized thermoreflectance and reflectance study of ReS2 and ReS2:Au single crystals

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  • Polarized thermoreflectance and reflectance study of ReS2 and ReS2 Au single crystals
  • Special issue: Solid state devices and materials
  • Special issue Solid state devices and materials

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<jats:p> In this article, we present the optical study of undoped and Au-doped rhenium disulphide (ReS<jats:sub>2</jats:sub> and ReS<jats:sub>2</jats:sub>:Au) using temperature- and polarization-dependent thermoreflectance (PTR) and reflectance (<jats:italic>R</jats:italic>) measurements. We have observed the indirect band gaps (<jats:italic>E</jats:italic> <jats:sub>g|| </jats:sub>, <jats:italic>E</jats:italic> <jats:sub>g⊥</jats:sub>), and direct band-edge excitonic transitions (<jats:italic>E</jats:italic> <jats:sub>1</jats:sub> <jats:sup>ex</jats:sup>, <jats:italic>E</jats:italic> <jats:sub>2</jats:sub> <jats:sup>ex</jats:sup>, <jats:italic>E</jats:italic> <jats:sub>3</jats:sub> <jats:sup>ex</jats:sup> and <jats:italic>E</jats:italic> <jats:sub>4</jats:sub> <jats:sup>ex</jats:sup>) at various polarization angles. The amplitudes of <jats:italic>E</jats:italic> <jats:sub>1</jats:sub> <jats:sup>ex</jats:sup> and <jats:italic>E</jats:italic> <jats:sub>2</jats:sub> <jats:sup>ex</jats:sup> transitions have an orthogonal characteristic and follow the Malus rule. A small blue-shift of indirect band gaps has been observed for the ReS<jats:sub>2</jats:sub>:Au sample, we believe that this result is contributed from the doping effects. We also measured the temperature-dependent PTR spectra in the temperature range from 55 to 300 K, and determined the temperature dependences of the transition energies and broadening parameters of <jats:italic>E</jats:italic> <jats:sub>1</jats:sub> <jats:sup>ex</jats:sup> and <jats:italic>E</jats:italic> <jats:sub>2</jats:sub> <jats:sup>ex</jats:sup> transitions. Reflectance measurements at various polarizations have been performed to confirm our observations. </jats:p>

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