LIMNO develops scalable method for alloyed 2D material production

Alloying of 2D TMDs is an known route to produce robust semiconductor materials with continuously tuneable optoelectronic properties. However, typically-reported methods for fabricating alloyed 2D TMD nanosheets are not suitable for the inexpensive, scalable production of large-area (m²) devices. In a new paper, Dr. Rebekah Wells and co-workers describe a general method to afford large quantities of compositionally-tuneable 2D TMD nanosheets using commercially available powders and liquid-phase exfoliation. Beginning with Mo_(1−x)W_xS₂ nanosheets, the authors demonstrate tuneable optoelectronic properties as a function of composition. The reported method is extended to produce Mo_0.5W_0.5Se₂ MoSSe, WSSe, and quaternary Mo_0.5W_0.5SSe nanosheets. High-resolution scanning transmission electron microscopy (STEM) imaging confirms the atomic arrangement of the nanosheets, while an array of spectroscopic techniques is used to characterize the chemical and optoelectronic properties. This transversal method represents an important step towards upscaling tailored TMD nanosheets with a broad range of tuneable optoelectronic properties for large-area devices.