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Doganov, Rostislav A; O'Farrell, Eoin C T; Koenig, Steven P; Yeo, Yuting; Ziletti, Angelo; Carvalho, Alexandra; Campbell, David K; Coker, David F; Watanabe, Kenji; Taniguchi, Takashi; Castro Neto, Antonio H; Özyilmaz, Barbaros
Nature communications, 04/2015, Volume: 6, Issue: 1Journal Article
Ultrathin black phosphorus is a two-dimensional semiconductor with a sizeable band gap. Its excellent electronic properties make it attractive for applications in transistor, logic and optoelectronic devices. However, it is also the first widely investigated two-dimensional material to undergo degradation upon exposure to ambient air. Therefore a passivation method is required to study the intrinsic material properties, understand how oxidation affects the physical properties and enable applications of phosphorene. Here we demonstrate that atomically thin graphene and hexagonal boron nitride can be used for passivation of ultrathin black phosphorus. We report that few-layer pristine black phosphorus channels passivated in an inert gas environment, without any prior exposure to air, exhibit greatly improved n-type charge transport resulting in symmetric electron and hole transconductance characteristics.
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