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Although a considerable number of solvent based methodologies have beendeveloped for exfoliating black phosphorus, so far there are no reports oncontrolled organization of these exfoliated nanosheets on substrates. Here, forthe first time to the best of our knowledge, a mixture ofN-Methyl-2-pyrrolidone (NMP) and deoxygenated water is employed as a subphasein Langmuir Blodgett (LB) trough for assembling the nanosheets followed bytheir deposition on substrates and studied its field effect transistor (FET)characteristics. Electron microscopy reveals the presence of densely aligned,crystalline, ultra-thin sheets of pristine phosphorene having lateraldimensions larger than hundred of microns. Furthermore, these assemblednanosheets retain their electronic properties and show a high currentmodulation of 10^4 at room temperature in FET devices. The proposed techniqueprovides semiconducting phosphorene thin films that are amenable for large areaapplications.

Large Area Fabrication of Semiconducting Phosphorene by Langmuir Blodgett Assembly