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Keywords:

  • molybdenum disulfide;
  • molybdenum diselenide;
  • transition metal dichalcogenides;
  • CVD;
  • alloys;
  • bandgap engineering;
  • atomically thin films
Thumbnail image of graphical abstract

MoS2(1−x) Se2x single-layer films are prepared using a mixture of organic selenium and sulfur precursors as well as a solid molybdenum source. The direct bandgaps are found to scale nearly linearly with composition in the range of 1.87 eV (pure single-layer MoS2) to 1.55 eV (pure single-layer MoSe2) permitting straightforward bandgap engineering.