Confined Electrons in 2D Materials: from Quantum-confined Semiconductors to a 2D Electron Gas

Dr. Scott C. Warren, University of North Carolina
February 27, 2017 at 11:00 am
241 Compton
Event Description 

The discovery of graphene in 2004 launched the field of 2D materials. In the field’s short existence, important new 2D materials have been developed, including MoS2 and BN. This presentation will describe our work to discover and understand several additional 2D materials. These materials include phosphorene, a quantum-confined 2D semiconductor, and Ca2N, an unusual 2D material with a gas of electrons that is physically separated from its atoms. In both cases, we have sought to understand the optical and electronic properties of these 2D materials. The talk will reveal our efforts to understand why 2D phosphorene remains quantum confined, even when it is restacked into electrically conductive 3D materials. The talk will also describe our discovery of 2D Ca2N, which has an electrical conductivity similar to silver. In each case, we will highlight how the unique properties of these materials have enabled application of these materials in energy conversion and energy storage. Collectively, our efforts show how 2D materials are emerging as a fascinating platform for fundamental science and for energy technologies.