A Zener diode is made by

Question

A Zener diode is made by, heavily doping both $p$ - and $n$-sides of a $p-n$ junction diode, heavily doping the $p$-side and lightly doping the $n$-side of a $p-n$ junction diode, lightly doping the $p$-side and heavily doping the $n$-side of a $p-n$ junction diode, lightly doping both $p$ - and $n$-sides of a $p-n$ junction diode

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A Zener diode is made by heavily doping both $p$ and $n$-sides of the junction. Because of heavily doping, a very thin $\left(\angle 10^{-6} \mathrm{~m}\right)$ 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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