Department of Physics, Engineering Physics & Astronomy

Queen's University
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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

CMP Seminar-"Optical and electrical studies on elemental 2D materials: Exfoliated black Phosphorus and graphene"

Richard Martel
U. Montreal

Thursday, January 15, 2015
10:30 am @ Stirling 401


Two elemental materials, graphene and exfoliated black phosphorus (P(black)), have recently been explored for their intriguing two-dimensional (2D) semiconducting properties. Graphene is a zero bandgap semimetal providing huge carrier mobility while P(black) exhibits a direct bandgap that is highly tunable with layer thickness and offers also uniquely high carrier mobility. Here we will discuss on the general optical and electrical properties of these 2D-materials in the context of electronic confinement and chemistry induced by environmental effects. A general scheme involving a charge transfer reaction to aqueous oxygen will be used to discussed the various effects observed, namely p-type doping for graphene and photo-oxidation of P(black) by air. These effects will be highlighted as important hurdles to overcome towards the development of devices and circuits, but also as new opportunities for sensing technologies. Because exfoliated P(black) is a fairly new member of the large family of 2D-materials, this system will be more specifically highlighted during this talk.