Question: Q. 14. (i) Why is zener diode fabricated by heavily doping both $p$-and $n$-sides of the junction ?

(ii) Draw the circuit diagram of zener diode as a voltage regulator and briefly explain its working.

U] [Foreign 2014]

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Solution:

Ans. (i) Due to the heavy doping, the depletion layer becomes very thin and electric field, across the junction, becomes very high even for a small reverse bias voltage. (ii) Circuit diagram

Any increase / decrease in the input voltage results in increase / decrease of the voltage drop across $R_{L}$, without any change in the voltage across the Zener diode.

[CBSE Marking Scheme 2014] 1

Commonly Made Error

  • Many students able to defined the working of zener diode but couldn’t write the reason of heavily doping of $p$ and $n$ sides of the junction.


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