describe the construction and working of the zender diode?
Answers
Explanation:
A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. ... The Zener diode has a well-defined reverse-breakdown voltage, at which it starts conducting current, and continues operating continuously in the reverse-bias mode without getting damaged.
The figure below, represents the diffused structure of a Zener diode:
construction of zener diode
Here, N and P substrate are diffused together. The junction region is covered with a layer of silicon dioxide (SiO2). At the same time during construction, the whole assembly is metallised in order to generate anode and cathode connection. The layer of SiO2 helps to prevent contamination of the junctions. Thus, is used in the construction of zener diode.
Working of Zener diode
The operation of a zener diode is like a normal diode in forward biased mode. That means a large majority current flows through the device when the forward potential is applied to it. However, a zener shows variation from a normal diode in the aspect of its doping concentration. Zener diode is highly doped thus its depletion width is very thin. Due to this, more current flows through a zener diode as compared to a normal junction diode.
It specifically acts in the breakdown region in the reverse biased condition. A zener diode shows two breakdown approach, zener breakdown, and avalanche breakdown.
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