event
Friday 24 Aug 2012: Stable Field Emission from a Nanoporous Semiconductor
Dr Fred Sharifi - Project Leader - Energy Research Group, National Institute of Standards and Technology (NIST), Gaithersburg, MD USA
Harrison 170 (3D Visualisation Suite) 11:30-12:00
Cold cathode electron field emitters have been the subject of on-going research for decades, due to the advantages they possess over thermionic emitters. A technology leading to field emitters that are reliable and operate at high current density would enable significant advances in several fields including microwave electronics and x-ray imaging. We report a new method for fabrication of high current density field emitter arrays based on nanoporous silicon carbide, capable of impressive performance in both emission current and reliability. The emitters are a monolithic structure whose fabrication does not require high temperature gas phase synthesis. For macroscopic arrays, stable continuous emission in excess of 6 A/cm^2 is demonstrated.
http://www.nist.gov/cnst/sharifi.cfm
