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AP EAMCET202021 Sep 2020Morning ShiftPhysicsSemiconductorsActual

A Zener diode is made by

Options

  1. Aheavily doping both (p ) - and (n )-sides of a (p-n ) junction diode
  2. Bheavily doping the (p )-side and lightly doping the (n )-side of a (p-n ) junction diode
  3. Clightly doping the (p )-side and heavily doping the (n )-side of a (p-n ) junction diode
  4. Dlightly doping both (p ) - and (n )-sides of a (p-n ) junction diode

Correct answer

A. heavily doping both (p ) - and (n )-sides of a (p-n ) junction diode

Step-by-step solution

A Zener diode is made by heavily doping both (p ) and (n )-sides of the junction. Because of heavily doping, a very thin ( ( 10⁻⁶ ~m ) ) depletion region is formed between the (p ) and (n )-sides, and hence the electric field of the junction is extremely high even for a small reverse bias voltage.

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