What do you mean 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 …
What is Mott Gurney law?
The Mott–Gurney law offers some crucial insight into charge-transport across an intrinsic semiconductor, namely that one should not expect the drift current to increase linearly with the applied voltage, i.e., from Ohm’s law, as one would expect from charge-transport across a metal or highly doped semiconductor.
What is space charge semiconductor?
space charge, electrical charge distributed through a three-dimensional region. Another example of space charge occurs when two different semiconductor materials are brought together.
What is the negative effect of space charge?
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 space charge compensator?
Space charge compensator – A device added to the filament circuit that automatically lowers the filament current as the kV is increased. This keeps the tube current (mA) constant.
Which is true for limited space charge accumulation mode?
A mode of operation of a Gunn diode in which the frequency of operation is set by a resonant circuit to be much higher than the transit-time frequency so that domains have insufficient time to form while the field is above threshold and, as a result, the sample is maintained in the negative conductance state during a …
How is the space charge region 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. The generation of space charge region is important to separate the photogenerated electrons and holes toward opposite directions.
What is the child-Langmuir law?
The Child-Langmuir (CL) law is one of the most well known and often applied laws of plasma physics which states that the behavior of the current density in a planar vacuum tube diode is proportional to the three-halves power of the bias potential and inversely proportional to the square of the gap distance between the …
What is space charge effect in mass spectrometry?
Space charge effects are imposed on a collection of ions of different masses and different energies. In mass analyzers such as FT and ion-trap mass spectrometers, the consequences of space charge play out within the collection of ions of all masses stored in a constrained area in the mass analyzer.