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Keywords:

  • Indium selenide;
  • two-dimensional systems;
  • dichalcogenides;
  • atomic force microscopy;
  • micro-photoluminescence
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Strong quantization effects and tuneable near-infrared photoluminescence emission are reported in mechanically exfoliated crystals of γ-rhombohedral semiconducting InSe. The optical properties of InSe nanosheets differ qualitatively from those reported recently for exfoliated transition metal dichalcogenides and indicate a crossover from a direct to an indirect band gap semiconductor when the InSe flake thickness is reduced to a few nanometers.