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Question
Answer in brief.
How is a Zener diode different than an ordinary diode?
Solution
A Zener diode is heavily doped, with doping concentrations greater than 1018 cm-3 in both the p- and n-regions, whereas an ordinary diode has doping concentrations of 1017 cm-3 or less. As a result, the peak inverse voltage (PIV) of an ordinary diode is greater than that of a Zener diode, and the breakdown occurs through impact ionisation (avalanche process). Other than that, their I-V characteristics are similar.
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