Daniele Vella
Email Address
phydv@nus.edu.sg
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Publication Monolayer black phosphorus by sequential wet-chemical surface oxidation(Royal Society of Chemistry, 2019) Wild, S.; Lloret, V.; Vega-Mayoral, V.; Vella, D.; Nuin, E.; Siebert, M.; Kolesnik-Gray, M.; Löffler, M.; Mayrhofer, K.J.J.; Gadermaier, C.; Krstic, V.; Hauke, F.; Abellán, G.; Hirsch, A.; PHYSICSWe report a straightforward chemical methodology for controlling the thickness of black phosphorus flakes down to the monolayer limit by layer-by-layer oxidation and thinning, using water as solubilizing agent. Moreover, the oxidation process can be stopped at will by two different passivation procedures, namely the non-covalent functionalization with perylene diimide chromophores, which prevents the photooxidation, or by using a protective ionic liquid layer. The obtained flakes preserve their electronic properties as demonstrated by fabricating a BP field-effect transistor (FET). This work paves the way for the preparation of BP devices with controlled thickness. © The Royal Society of Chemistry.