17th Semi-Annual Research Mixer
WAC Fall Workshops
Blackboard Hybrid Workshops
Bearing Witness
GenEdge Theme 2019
Student Travel Overview
L4
PDAC Travel Funds Guidelines
Quantitative Reasoning
CUNYfirst guides
Loading Events

« All Events

  • This event has passed.

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

Details

Date:
October 27, 2016
Time:
12:00 pm - 1:00 pm
Event Category:
Event Tags:
, , ,

Location

Venue/Room:
N-823

Organizer

Physics Department

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

Abstract:

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.