What Is Space Charge Limited?

First proposed by Clement D. Child in 1911, Child's law states that the space-charge limited current (SCLC) in a plane-parallel vacuum diode varies directly as the three-halves power of the anode voltage Va and inversely as the square of the distance d separating the cathode and the anode.


What do you mean by space charge? Space charge is a concept in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point-like charges. The sign of the space charge can be either negative or positive.

what is space charge effects?

Space charge refers to the collection of electrons which are emitted from the metal surface, after the application of tube current, at a short distance away from the metal surface. This space charge repels and limits the further emission of electrons from the surface and is referred to as the space charge effect.

What is the charge effect? Space charge refers to the collection of electrons which are emitted from the metal surface, after the application of tube current, at a short distance away from the metal surface. This space charge repels and limits the further emission of electrons from the surface and is referred to as the space charge effect.

what is space charge in diode?

physics. Space charge, electrical charge distributed through a three-dimensional region. In an electron tube, for example, a negative charge results because electrons that are emitted from the cathode do not travel instantaneously to the plate (anode) but require a finite time for the trip.

What is meant by depletion region? Depletion region or depletion layer is a region in a P-N junction diode where no mobile charge carriers are present. Depletion layer acts like a barrier that opposes the flow of electrons from n-side and holes from p-side.

what is space charge neutrality?

Charge Neutrality. Charge neutrality occurs when all the charge in a volume adds to zero; it is neutral, neither positive or negative. The zero net charge does not mean that the electrons, holes, ionized donors, and ionized acceptors are not present in the semiconductor.

What is child's law? Definition. Child's Law (or the Child-Langmuir Law or three-halves-power law) gives the maximum space-charge-limited current in a planar diode of infinite radius (i.e. one-dimensional beam) as a function of the length and potential difference between anode and cathode.

What is space charge in pn junction?

The space charge region is the region around the metallurgical junction where all the ionized acceptors and donors were uncovered and remain. The number of ionized acceptors on the p-side equals the number of ionized donors on the n-side.

How the space charge region is formed? When a bulk semiconductor is in contact with a different semiconductor, metal or electrolyte, a space charge region is formed at the interface to equalize the Fermi levels.

What is space charge polarization?

Interfacial or space charge polarization occurs when there is an accumulation of charge at an interface between two materials or between two regions within a material because of an external field. This can occur when there is a compound dielectric, or when there are two electrodes connected to a dielectric material.

What is Richardson Dushman equation?

The Richardson-Dushman equation relates the current density of a thermionic emission to the work function (W) and temperature (T) of the emitting material: js = A T2 exp(-W/kT) where. js is the current density of the emission (mA/mm2) A is Richardson's constant.

How space charge is formed in a vacuum diode?

The electrons flowing between the cathode and the anode form a cloud of electrons and this is known as the "space charge". The space charge tends to repel electrons leaving the cathode, forcing them back.

What is meant by space charge region?

In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an

Why space charge region is called depletion region?

The depletion region is also called as depletion zone, depletion layer, space charge region, or space charge layer. The depletion region acts like a wall between p-type and n-type semiconductor and prevents further flow of free electrons and holes. Answer: Because, decrease in quantity of something.

What are the carriers for positive and negative charge?

One is electrons, which carry a negative electric charge. In addition, it is convenient to treat the traveling vacancies in the valence band electron population (holes) as a second type of charge carrier, which carry a positive charge equal in magnitude to that of an electron.

What do u mean by diode?

A diode is a specialized electronic component with two electrodes called the anode and the cathode. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium. The fundamental property of a diode is its tendency to conduct electric current in only one direction.

What is the purpose of a diode?

The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking it in the opposite direction (the reverse direction). As such, the diode can be viewed as an electronic version of a check valve.

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