What is an abrupt pn junction?
An abrupt junction is by definition a junction in which the doping type changes over a very small distance compared to the spatial extent of the depletion region (see below.) Figure EC1 : Donor and acceptor density profiles in an abrupt PN junction.
What is pn junction diode explain with diagram?
Definition: A P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor. The p-side or the positive side of the semiconductor has an excess of holes and the n-side or the negative side has an excess of electrons.
What happens when a forward bias is applied to a PN junction?
When a forward bias is applied to a p-n junction, it lowers the value of potential barrier. In the case of a forward bias, the potential barrier opposes the applied voltage. Hence, the potential barrier across the junction gets reduced.
What is forward bias and reverse bias in a pn junction?
Forward biasing indicates the application of a voltage across a diode that enables current to flow easily, while reverse biasing means putting a voltage across a diode in the opposite direction.
What is abrupt diode?
Abrupt varactor diodes As the abruptness of the junction is governed by the doping concentration and also the profile, this is controlled during the manufacture. For an abrupt varactor diode the doping concentration is held constant, i.e constant doping level as far as reasonably possible.
What is the correct meaning of the word abrupt?
sudden and unexpected
Definition of abrupt 1a : characterized by or involving action or change without preparation or warning : sudden and unexpected came to an abrupt stop an abrupt turn an abrupt decision to retire. b : rudely or unceremoniously curt She has an abrupt manner.
What is a pn junction diode draw and explain its VI characteristics?
A P-N Junction Diode is formed by doping one side of a piece of silicon with a P-type dopant (Boran) and the other side with a N-type dopant (phosphorus). Ge can be used instead of Silicon. The P-N junction diode is a two-terminal device. This is the basic construction of the P-N junction diode.
How pn junction is formed explain?
P-n junctions are formed by joining n-type and p-type semiconductor materials, as shown below. Since the n-type region has a high electron concentration and the p-type a high hole concentration, electrons diffuse from the n-type side to the p-type side.
What happens if forward bias is made very high?
When the voltage reaches a high negative value known as the breakdown voltage, VBR, the diode starts to conduct in the reverse direction. At breakdown, the current sharply increases and becomes very highin the negative direction.
What happens when diode is forward biased?
A forward-biased diode conducts current and drops a small voltage across it, leaving most of the battery voltage dropped across the lamp. If the battery’s polarity is reversed, the diode becomes reverse-biased, and drops all of the battery’s voltage leaving none for the lamp.
What happens during forward bias and reverse bias?
Forward bias decreases a diode’s resistance, and reverse bias increases a diode’s resistance. The current flows effortlessly while in forward bias, but reverse bias does not permit current to flow through the diode.
