Possible Ways to reduce Electron field Emission threshold

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SUMMARY

The discussion focuses on reducing the electric field required for electron tunneling, specifically referencing the Schottky-Nordheim approach with a work function of 4 eV for Aluminum. The theoretical calculation indicates a tunneling field of 870 kV/mm, while practical measurements show a maximum of 250 kV/mm. Factors such as surface roughness and space charges are considered, prompting inquiries into the underlying reasons for this discrepancy in high voltage applications.

PREREQUISITES
  • Understanding of Schottky-Nordheim tunneling theory
  • Familiarity with work function concepts in materials science
  • Knowledge of surface roughness effects on electron emission
  • Basic principles of high voltage breakdown measurements
NEXT STEPS
  • Research advanced techniques for measuring surface roughness in conductive materials
  • Explore the impact of space charge effects on electron emission
  • Study modifications to the Schottky-Nordheim model for practical applications
  • Investigate alternative materials with lower work functions for electron tunneling
USEFUL FOR

This discussion is beneficial for physicists, electrical engineers, and researchers involved in high voltage applications and electron emission studies.

domovinavi
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Hello there,

i wanted to ask if anyone knows a process or mechanism, that reduces the electric field that is requiered to tunnel an electron. When i use the work function of 4 eV (Aluminum) i get with Schottky-Nordheim approach a field of 870 kV/mm to tunnel an electron. Measurements tho just get in the best case to 250 kV/mm, also including calculations for surface roughness and space charges. Does anyone have an idea what the possible reason is for this behaviour?Context: breakdown measurements of high voltage applications
 
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Can you explain a bit more. Is this emission into free space or between conductors?
 

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