Tradeoff between proximity and aspect-ratio in optimizing the field enhancement factor of large area field emitters

2020 ◽  
Author(s):  
Thiago A. de Assis ◽  
Fernando F. Dall'Agnol ◽  
Marc Cahay
Keyword(s):  
Aspect Ratio ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Large Area ◽  
Field Emitters

Near-Field Calibration of Isolated Carbon Nanotube Field Emitters for Nanomanufacturing Applications

2004 ◽  
Author(s):  
King-Fu Hii ◽  
R. Ryan Vallance ◽  
Padmakar D. Kichambare ◽  
M. Pinar Mengu¨c¸
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Near Field ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Strong Function ◽  
Field Calibration ◽  
Turn On ◽  
Field Emitters ◽  
Precise Knowledge

This paper reports the development of an apparatus, technique, and method for calibrating the field emission phenomena’s dependence on both the voltage applied between the anode and cathode and the electrodes gap. A precise knowledge of the electrodes gap is required for calibrating field emitters. The I-V characteristic of isolated carbon nanotube field emitter is a strong function of the electrodes gap distance. A consolidated IV curve is obtained by calculating the current density and the local electric field with the field enhancement factor taken into consideration. The field enhancement factor and emitting area are unique for each electrodes gap distance. We also found that the turn-on voltage decreases as the electrodes gap distance decreases.

Field-Enhancement Factor of a Carbon Nanotube Cold Cathode Triode

2014 ◽  
Vol 552 ◽  
pp. 257-262
Author(s):  
Da Lei ◽  
Qi Qi Ge Menggen
Keyword(s):  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Model System ◽  
Field Enhancement Factor ◽  
Geometrical Parameters ◽  
Hole Size ◽  
Cold Cathode ◽  
Image Charge

To estimate the field-enhancement factor, the model system of floated sphere in triode configuration of the carbon nanotube was proposed, and the actual electric field and field-enhancement factor at the apex of carbon nanotube were calculated with the image charge method analytically. The field-enhancement factor given as β=3+ρ+W, where ρ is the aspect ratio of the carbon nanotube, and W is the function of geometrical parameters and the anode and gate voltages. The geometrical parameters affects the field-enhancement factor very much, such as the field-enhancement factor decreased rapidly with the increasing of top radius of carbon nanotube, gate-cathode distance and gate-hole size. The field-enhancement factor could be improved via concocting the gate-electrode.

Can we reliably estimate the emission field and field enhancement factor of carbon nanotube film field emitters?

2002 ◽  
Vol 11 (3-6) ◽  
pp. 763-768 ◽  
Author(s):  
Jean-Marc Bonard ◽  
Mirko Croci ◽  
Imad Arfaoui ◽  
Olivier Noury ◽  
Debajyoti Sarangi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Carbon Nanotube Film ◽  
Field Emitters
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