What is a Fowler Nordheim plot?
The nonlinear Fowler−Nordheim (FN) plot is analyzed according to a model of calculation based on saturation of conduction band current and predominance of valence band current at high-field values. The simulated FN plot exhibits similar features to those observed experimentally.
What is thermal field emission?
Thermionic emission is the liberation of electrons from a metal by virtue of its temperature (releasing of energy supplied by heat). This occurs because the thermal energy given to the charge carrier overcomes the work function of the material.
What is electric field emission?
16.6. Field emission is the extraction of electrons from a material upon the application of an external electric field. One-dimensional conducting tips are required as they exhibit the highest electric field enhancement factor, β, which reduces the external electric field required for emission.
What is the magnitude of electric field in field emission?
In field electron emission (FE), applying a high negative electric field, of magnitude typically 1–10 V/nm, causes electron tunneling from a material surface into vacuum.
What is field emission in physics?
field emission, also called Cold Emission, discharge of electrons from the surface of a material subjected to a strong electric field. The resulting current of electrons through the surface of a material under the influence of a strong electric field is called field emission.
What is field emission and thermionic emission?
The former, called thermionic emission when electrons are excited by heat [1], typically requires cathode temperatures ~103 K. The latter, called field emission, occurs when a high voltage thins the potential barrier [2], and typically requires the cathode electric field to be greater than ~108 V/m.
How does field emission display work?
Operation. FED display operates like a conventional cathode ray tube (CRT) with an electron gun that uses high voltage (10 kV) to accelerate electrons, which in turn excite the phosphors, but instead of a single electron gun, an FED display contains a grid of individual nanoscopic electron guns.
What are the types of electron emission?
Electron emission from a material surface occurs through three main possible processes; photoemission, thermionic emission, and field emission (Jensen, 2007b).
Where is field emission used?
The resulting current of electrons through the surface of a material under the influence of a strong electric field is called field emission. This effect is utilized in the field-emission electron microscope, which in some instances achieves resolution of atomic dimensions.
What is thermionic emission and field emission?
What is emissive display?
Emissive Display: The emissive displays are devices that convert electrical energy into light. Examples are Plasma Panel, thin film electroluminescent display and LED (Light Emitting Diodes).
What is the Fowler-Nordheim formula for field emission from metals?
Field emission from metals into a vacuum has been studied most thoroughly. In this case the Fowler-Nordheim formula holds: Here, h is Planck’s constant, m is the mass of the electron, φ is the work function of the metal, and t (y) and θ (y) are functions of the variable (values of the functions can be obtained from tables).
What is the Fowler-Nordheim 1928 theory?
Strictly, if the barrier field in Fowler-Nordheim 1928 theory is exactly proportional to the applied voltage, and if the emission area is independent of voltage, then the Fowler-Nordheim 1928 theory predicts that plots of the form (log(i/V2) vs. 1/V) should be exact straight lines.
Did Fowler-Nordheim work prove the existence of electron tunneling?
The literature often presents Fowler-Nordheim work as a proof of the existence of electron tunneling, as predicted by wave-mechanics. Whilst this is correct, the validity of wave-mechanics was largely accepted by 1928.
What is the meaning of field emission?
Field electron emission. Field electron emission (also known as field emission (FE) and electron field emission) is emission of electrons induced by an electrostatic field. The most common context is field emission from a solid surface into vacuum.