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Physics Seminar: Black phosphorus and phosphorene: from 3D to 2D and back


October 27, 2016
12:00 pm - 1:00 pm
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Physics Department

Presented by Dr. Scott C. Warren of University of North Carolina at Chapel Hill


Phosphorene, a two-dimensional (2D) form of elemental phosphorus, has attracted considerable interest in recent years.  This interest is due, in large part, to predictions and observations of high mobility (several thousand cm2/Vs), a highly tunable band gap, anisotropic optoelectronic properties, and strong light-matter interactions.  This talk provides an introduction to phosphorene and our experiments to explore these and related properties.  To this end, we have developed a synthetic approach for production of phosphorene at a 10-gram scale.  With significant quantities of phosphorene now available, we have measured the band gap as a function of flake thickness, finding that the band gap ranges from 0.33 eV in bulk to 2.1 eV in monolayers, a range that is larger than any other 2D material.  We also describe our efforts to employ phosphorene in a variety of solar-energy harvesting systems, including in solar-to-chemical and solar-to-electric energy conversion.  Perhaps most interesting, we show how phosphorene can be re-assembled into 3D structures that are electrically conductive but still remain quantum confined, therefore providing access to 3D materials with widely tunable optoelectronic properties.

Nucleus Volume 9 WInter 2018