In a Zener diode,

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(C) Zener diode is a special type of semiconductor diode designed to operate in the reverse breakdown region. To achieve a sharp breakdown voltage,bot

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Both $p$ and $n$ regions are heavily doped

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(C) Zener diode is a special type of semiconductor diode designed to operate in the reverse breakdown region. To achieve a sharp breakdown voltage,both the $p$-region and the $n$-region of the Zener diode are heavily doped. This heavy doping results in a very thin depletion layer. When a reverse bias voltage is applied and reaches the breakdown voltage,the high electric field across the thin depletion layer causes a rapid increase in current due to Zener breakdown.

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