Practice portal › Semiconductor Electronics › Zener Diode as a Voltage Regulator
Asked in JEE Main 24th Feb 2nd Shift 2021 · Zener characteristics
Zener breakdown needs a very strong field across the junction, of order 10⁶ V/m or more.
Heavy doping on both sides makes the depletion layer very thin, so even a few volts give such a field.
The field pulls electrons out of covalent bonds (field ionisation).
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