Transition-metal dichalcogenides like molybdenum disulphide have attracted great interest as two-dimensional materials beyond graphene due to their unique electronic and optical properties. Solution-phase processes can be a viable method for producing printable single-layer chalcogenides. Molybdenum disulphide can be exfoliated into monolayer flakes using organolithium reduction chemistry; unfortunately, the method is hampered by low yield, submicron flake size and long lithiation time.
National University of Singapore (NUS) scientists have developed a new method for creating a chemical solution of molybdenum disulfide for use in printable optoelectronic devices such as thin film solar cells, flexible logic circuits, photodetectors, and sensors.
Molybdenum disulfide, combined with gold atoms, is being studied for development of ultrafast, ultrathin logic devices, as noted previously on KurzweilAI.
- Chemically exfoliate (peel off) molybdenum disulfide crystals into high-quality single-layer flakes (the new method achieves higher yield and larger flake size than current methods).
- Convert the flakes into an inkjet-printable solution (the good dispersion and high viscosity of the flakes make them highly suitable for inkjet printing).
- Print wafer-size films. Current processes of producing printable single-layer chalcogenides (such as molybdenum disulfide) take a long time and the yield is poor. The flakes produced are of submicron sizes, which make it challenging to isolate a single sheet for making electronic devices.