University of South C arolina

1. University of SouthCarolina Silicon Carbide Laboratory EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy Emissions Sensing, Monitoring & Controls Using SiC and Graphene Electrochemistry of Epitaxial Graphene -Advanced functionality & Catalysis -Hydrogen storage, CO2 remediation If I was an electron? Nanoelectronics and plasmonics for Computing & power using Graphene and SiC “Weightless” behavior of matter & Other Exotic Physics

2. University of SouthCarolina Silicon Carbide Laboratory Graphene Graphane Si-face` RMS: 1.04nm RMS: 1.00nm RMS: 0.57nm C-face RMS: 1.62nm RMS: 2.83nm EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy Energy Applications of Epitaxial Graphene Electrochemistry using epitaxially grown EG on SiC substrates to produce advanced graphene Compounds for electronic and optical applications • TUNABLE Bandgap 0-3.5eV! Post-CMOS • Study H2 storage-SiC substrate changes chemistry • Study other electrochemical reactions Conductivity, work function and reflectivity of graphene change in response to combustion emissions NO2, CO • Potential for single molecule sensitivity • Commercializable material platform-SiC substrates • Dramatically different physics than traditional materials

3. University of SouthCarolina Silicon Carbide Laboratory EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy Plasmons & Polaritons in Epitaxial Graphene on SiC for Electrically Actuated Advanced Nanophotonics Backgate to actuate between plasmon waveguide & detector modes • Scientific/Technical Impact: • Fundamental insight into how plasmons can be converted into an electrical current and vice-versa • Structure & Composition both matter. • EG/SiCmetamaterials approach overcomes diffraction limit of light by>10x. • First systematic experimental investigation of polaritons in EG/SiC, a high impact material system • Enable new paradigms in light generation. • Make practical compact plasmonic devices that currently require bulky spectrometers. Key Insight/Innovation • Potential Applications: • >THz speed, compact computing • Compact plasmonic sensors • Bioagents, chemical agents, infrared • Ionizing radiation • Infrared and terahertz light sources • sensing & imaging for munitions

4. University of SouthCarolina Silicon Carbide Laboratory ~2ML thick graphene EE RESEARCH - Dr. MVS Chandrashekhar-Epitaxial Graphene for Clean Energy Plasmonic Effects in Epitaxial Graphene Ideal gaphene has constant conductivity per ML i.e. reflectivity is only dependent on thickness outside restrahlen band Bare SiC substrate With adsorption of emissions gases for constant thickness reflectivity changes ~20% for 10ppm NO2 -Nonideality! Surface charged impurity scattering! -Enables probing of the nanoscaleopto-physics of EG Fit to theory gives Thickness of EG Electron scattering time Carrier concentration in EG Polariton in graphene λ0= electromagnetic excitation wavelength λSPP= surface plasmon polariton wavelength λSPP< λ0 opens a new area of nanoscaled optoelectronics overcomes diffraction limit