Pn Junction Diode Construction And Working Pdf

pn junction diode construction and working pdf

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Definition : A special type of PN junction diode that operates in reverse biased mode, more specifically in breakdown region is known as Zener Diode.

In general, all the electronic devices need DC power supply but it is impossible to generate DC power so, we need an alternative to get some DC power thus the usage of diodes comes into the picture to convert AC power to DC power. A diode is a tiny electronic component used in almost all the electronic circuits to enable the flow of current in only one direction unidirectional device. We can say that the usage of semiconductor materials to build the electronic components was started with diodes.

PN Junction Diode Construction Working And Uses

An avalanche diode is a special type of semiconductor device designed to operate in reverse breakdown region. Avalanche diodes are used as relief valves a type of valve used to control the pressure in a system to protect electrical systems from excess voltages. Avalanche diodes are generally made from silicon or other semiconductor materials. The construction of avalanche diode is similar to zener diode but the doping level in avalanche diode differs from zener diode. Zener diodes are heavily doped.

A diode is formed by joining two equivalently doped P-Type and N-Type semiconductor. When they are joined an interesting phenomenon takes place. The P-Type semiconductor has excess holes and is of positive charge. The N-Type semiconductor has excess electrons. Hence the electron diffuses and occupies the holes in the P-Type material.

Zener Diode

A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. Doping with acceptor creates p type semiconductor while doping with donors produces n type. Thus a pn junction is formed in diode. The formation of pn junction in a single crystal due to doping with p type and n type material is shown in figure below. In the above figure, left side of crystal is p type while the right side is n type. The positively charged donor ions in n type is shown by encircled plus sign while negatively charge acceptor ions are shown by encircled minus sign.

Definition: The tunnel diode is a highly conductive, heavily doped PN-junction diode in which the current induces because of the tunnelling. The tunnelling is the phenomenon of conduction in the semiconductor material in which the charge carrier punches the barrier instead of climbing through it. The tunnel diode is a heavily doped PN-junction diode. The concentration of impurity in the normal PN-junction diode is about 1 part in 10 8. And in the tunnel diode, the concentration of the impurity is about 1 part in 10 3. Because of the heavy doping, the diode conducts current both in the forward as well as in the reverse direction.


State Ohm's Study the working principle of PN junction diode and transistor. Diode Working Principle Pdf images Characteristics and Working of P-N Junction Diode. Construction: pn Junction [ENGN Home] -type region and is used to.


Understanding about the P-N Junction Diode Theory and Working

Electrical Academia. Definition: A diode is the simplest semiconductor component. It is made of only two pieces from different semiconductor materials.

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Construction and Working of PN Junction Diode. Types, Advantages, applications and V-I Characteristics of Diodes. What is a Diode and How does it Work.

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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.

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