A model study of the role of workfunction variations in cold field emission from microstructures with inclusion of field enhancements

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Abstract

An analytical study of field emission from microstructures is presented that includes position-dependent electric field enhancements, quantum corrections due to electron confinement and fluctuations of the workfunction. Our calculations, applied to a ridge microstructure, predict strong field enhancements. Though quantization lowers current densities as compared to the traditional Fowler-Nordheim process, strong field emission currents can nonetheless be expected for large emitter aspect ratios. Workfunction variations arising from changes in electric field penetration at the surface, or due to interface defects or localized screening, are shown to be important in enhancing the emission currents.

Original languageEnglish
Article number105038
JournalSemiconductor Science and Technology
Volume30
Issue number10
DOIs
StatePublished - Sep 21 2015

Keywords

  • field emission
  • fowler nordheim
  • model analyses
  • quantum confinement
  • workfunction variations

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