What is Potential Barrier | Formation of Depletion Region | Electronic Devices and Circuits

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What is potential barrier?
Definition:
The significance of this built-in potential across the junction, is that it opposes both the flow of holes and electrons across the junction and is why it is called the potential barrier. The resulting electronic device that has been made is commonly called a PN junction Diode or simply Signal Diode.
Formation of the Depletion Region:
At the instant of the PN junction formation free electrons near the junction diffuse across the junction into the P region and combine with holes.
Filling a hole makes a negative ion and leaves behind a positive ion on the N side.
These two layers of positive and negative charges form the depletion region, as the region near the junction is depleted of charge carriers.
As electrons diffuse across the junction a point is reached where the negative charge repels any further diffusion of electrons.  
The depletion region now acts as a barrier.
Barrier Potential:
External energy must be applied to get the electrons to move across the barrier of the electric field.
The potential difference required to move the electrons through the electric field is called the barrier potential.
Barrier potential of a PN junction depends on the type of semiconductor material, amount of doping and temperature.  
This is approximately 0.7V for silicon and 0.3V for germanium.
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Created:	7. 3. 2022 04:05:19

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What is Potential Barrier | Formation of Depletion Region | Electronic Devices and Circuits